1996 - 2002 GM 6.5L Diesel Stanadyne Injection Pump Timing Adjustment TDCO Procedure (Chevy & GMC)

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Күн бұрын

In this video we will go thru how to adjust the Stanadyne DS4 diesel fuel injection pump timing mounting position on the GM 6.5L diesel engines. This particular process is only performed after a out of specification Top Dead Center Offset (TDC Offset or TDCO) relearn result has occurred. Physically adjusting the injection pump is necessary, in this situation only, in order to bring the TDC offset back into GM shop manual factory specification. A worn timing chain can introduce as much as 4 degrees of timing variance. This series pump was used in Chevy, GMC, and Holden trucks of the GMT400 or old body style (OBS) variety as well as vans from the years 1994 thru 2002.
The engine illustrated in the video is the 1999 version of the L65 Turbo Charged VIN code F layout, but the timing adjustment procedure applies to all 6.5L engines with this series of electronic injection pump. The TDC offset procedure shown with the Tech2 scan tool may vary for pre-1996 vehicles though. A Tech2 scan tool and three specialized wrenches shown in the video will be required to perform this procedure.
NOTE: The TDCO is NOT the procedure to use when timing a new or used replacement injection pump, or even when reinstalling the original injection pump. You only perform this TDCO Learn procedure ONLY when:
- You replaced the PCM (new or used but different than original)
- You replaced the crankshaft sensor (new or used but different than original)
- You replaced BOTH the PCM and the crankshaft sensor (new or used for either but neither original)
- You replaced the entire engine (rebuilt or used where core engine components are not the originals)
The timing procedure for when you replace the injection pump is called TIME SET and I cover that in a different video here - • 1994 - 2002 GM OBS Tru...
WARNING: The torque value for the upper intake manifold crossover in the service manual page shown at 44:07 is WRONG. It's a typo on that page only, and should say 17 Foot Pounds!
The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:
There are several sources for the specialized wrenches including Kent-Moore J-29872-A, Kent-Moore J-41711, Kent-Moore J-41089, OTC 6087, OTC 6083, Sunluway SY-J-29872-A, and Snap-On S6133: ebay.us/Vbtqa2 or amzn.to/3qtV8ol
If you're looking to buy your own GM Tech2 scan tool: ebay.us/7bm2xX
For the GM C/K 1998 service manual I was using in this video: ebay.us/zNZ23T
And if you're looking for the GM 10137537 intake manifold extension gasket: ebay.us/wJI5fs
And if I've saved you some $$ here, consider some coins for the coffee tip-jar! ko-fi.com/drshock
1994 1995 1996 1997 1998 1999 2000 2001 2002 Suburban Blazer Tahoe Sierra Yukon Silverado Cheyenne
Chapters
0:00 - Problem overview
0:37 - Engine shroud removal
1:47 - Intake manifold extension removal
6:27 - Injection pump mounting location
8:21 - Special tools & procedure
16:42 - Adjustment of injection pump
26:06 - Scan tool TDC offset relearn
31:32 - Post adjustment overview
40:00 - Intake extension and shroud reassembly
#drshock #65diesel #chevytrucks
Disclaimer: DrShock, the alias for the human content creator for this KZfaq channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, vehicle whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle.

Пікірлер: 170

@DrShock 3 жыл бұрын

WARNING: The torque value in the GM service manual shown at 44:07 for the upper intake manifold crossover bolts is WRONG on that particular page due to a typographical error during printing. Which explains why it didn't feel _right_ to me and fortunately I go with experience and gut in such situations as you saw in the video. The correct torque for the upper should have had 17 foot pounds printed!

@christianvadella5906 3 жыл бұрын

Phenomenal video. Thanks for sharing. This is the best, most clearest video on injection pump timing for a 6.5 on KZfaq. Fantastic work, please continue to chronicle your 6.5 work!

@lymanivey6275 2 жыл бұрын

Thank you! I learned a ton about my truck from this video. Thought those holes in my injection pump were missing bolt holes lol.

@papa-he6qh Жыл бұрын

Thank you for great videos and unbelievable patience.

@chzx88able 2 жыл бұрын

Thank you so much for a super great detailed video! Norway does not have many American cars, so this video is perfect. One should look for a long time for a workshop that can American cars one hundred percent, in my city there is only one workshop. so thank you from NORWAY.

@MrPaulrak 2 жыл бұрын

Thank you for posting this video, it is incredibly helpful. I broke down and bought the made in Ghina Tech 2 tool and much to my surprise it worked well. Getting the sequence of the 45 sec pedal to the metal then 30 sec of ECM off was a huge pain. Onlty took about ten times...LOL. But I was able to get my way out of wack -2.29 down to 0 then back a little to -.79 (close enough) She runs soooo much better. The tool also told me that I had 14psi of boost at idle and 26psi of boost when my gauge says 13psi, so I know my sensor is bad. Got my 96 3500hd with the stock 6.5 running smooth. Thanks again

@creeplife2802 7 ай бұрын

Do you have a link where you bought the tech 2?

@DrShock 25 күн бұрын

In the video description

@stevenbean9706 3 жыл бұрын

Found my straight wrench went in easier than the curved special wrench. Also had all the sensors and wires out of my way. They really only connect 1 way so it goes back together pretty quick very good video 1mm isnt much but it makes a world of difference much like 1 mm bump on optical sensor. Ty

@xaviergonzalez5145 2 жыл бұрын

What a video Sir!!! Thank you so much!!!

@ricodinero4926 2 жыл бұрын

jaw dropping , what detailed vid.

@jasonhutchinson5144 2 жыл бұрын

Great job extremely helpful! Awesome job on instructions and video clearness

@jasonhutchinson5144 2 жыл бұрын

I’ve changed my crank sensor and cannot get the computer to do a relearn I’ve done the procedure over 15 times change the sensor twice thanking I have bad one and it stays at the -2.46 no matter what I do

@DrShock 2 жыл бұрын

@@jasonhutchinson5144 Like I showed in the video, the timing on getting the scan tool to trigger the TDCO reset is rather finicky but it shouldn't take more than a couple of tries. If I had this problem I'd look over my sensor harness for damage/corrosion, and do a general check of the grounds the PCM uses as this feels like a problem getting the engine computer to recognize the input(s).

@jasonhutchinson5144 2 жыл бұрын

@@DrShock yes I’ve went through the ground’s and made sure all were making solid contact, I replaced the crank sensor again and did 15 attempt’s at doing the relearn with no change I was unaware of the need to use AC Delco so my next one will be a AC Delco crank sensor and I will double check all the connections again the engine runs fine starts hard but does start there’s also a glow plug timing issue and I replaced the glow plug relay and still take’s 3-4 seconds to start can only get glow plugs to cycle for 6-8 seconds with new glow plugs even try disconnecting the temperature sensor to trick it into thinking the engine is extremely cold so it would do a max glow plug cycle and Nope

@waynetuuk7599 3 жыл бұрын

Extremely thorough video, very good descriptions and it came just at the proper time. I just had my 6.5LTD pump rebuilt and its in and running. You have a lot of room there to work compared to my 2001 van. You can barely see around the pump on a van even with all the air intake items removed all the way back to the turbo. Believe it or not the easiest way to work on a 6.5L van is to remove the dashboard which is actually not that difficult. Thanks for taking the time to video it all so well.

@papasmurf4328 2 жыл бұрын

great video!! example of how videos should be made

@testarossafarmstead3178 3 жыл бұрын

Excellent 6.5 timing video .

@vernonwilson140 3 жыл бұрын

Link to shop manual please

@DrShock 3 жыл бұрын

@Vernon Wilson You might try looking here www.gmt400.com/threads/88-95-service-manuals.43575/ or at this eBay affiliate link ebay.us/z5cENd

@ronbown3836 3 жыл бұрын

Why would anybody give this guy a thumbs down

@KK51500 6 ай бұрын

I have new reman 6.5 in my safari rv. It sure smokes allot. Wondering if I should put .5 mm of positive if that might help out with all the smoke and better starting in cold

@sandman9188 Жыл бұрын

The tech 2 has a command to activate the relearn in the special function section, that way you don't have to do the pedal stuff. Also it has an area in the same spot for viewing the offset by commanding the pump to 0.0 and viewing actual.

@DrShock Жыл бұрын

Yeah, but the GM service manual doesn't mention using that function so I don't use it.

@ronnie7193 3 жыл бұрын

my 6.0 engine shuts off after engine reaches operating temp or 10 miles use. has to cool off before it will restart. any ideal. i relocated the pmd

@jorgefonseca9225 Жыл бұрын

Hi 👋 you are a really professional GM mechanic 👌👍👍 a great explanation 👍 I have a 95 suburban 6.5TD and I changed a automatic transmission to a manual transmission and goes very well I'm a really satisfied 👏👌👌👍 but definitely I want to change a electronic diesel pump to a mechanical without a PMD and sensors etc... my question is if I changed I need to adjusted the diesel pump? Because she don't have any sensors information 🤔 just a cut off valve for stops a engine!! thanks I appreciate if anyone can help me cheers from Norway 🇳🇴 😀 👍 😊

@DrShock Жыл бұрын

Thanks, I don't get into much modification from GM factory work. I would presume such a mod would require a different PCM (from an older model year) to avoid a check engine light and throwing DTCs due to the lack of sensor feedback. If those were not concerns, you would still need to set the timing yes. I would suggest referencing the 1993 GM C/K truck factory service manual for how to set the timing for the Stanadyne mechanical DB-2 injection pump. As best I recall, 93 was the last year for mechanical before the electronic DS-4, and its PMD, replaced it in 1994.

@jmacedo7 3 жыл бұрын

Muy bien vídeo,👌 En mi caso llegó un poco tarde 😂 Pero gracias a internet foros y un viejo cd de mitchell 2005 me apoye para mi Suburban 98 c2500 Cuando repare su máquina y reemplace la bomba de inyección. Aquí en México no son muy experto en estos motores sólo en la zona fronteriza con norte con u.s.a. Del centro hacia el sur olvídese. Mi intención de escribirle es que quiero aclarar 2 puntos 1.- los manuales de técnico especifican usando el scan tech tool 1 visualice el Tdc offset y si no está dentro del rango de fabrica proceda hacer el ajuste. Y haga el aprendizaje usando los procedimientos con el acelerador del coche y un reloj. **Nota**: pero no especifican que si ya tienes el scan tech tool 2 ya no es necesario ya que en sus funciones avanzadas tiene una función llamado "learning Tdc offset" o Quick learning Tdc offset (Ya no me acuerdo bien, sale caro comprarlo para una sola vez, y tuve que ser recomendado y ser persona de mucha confianza para que me prestarán el Scanner por un día) Y créame todo la comodidad , presionando un solo botón, para el aprendizaje del Tdc) 2.- según los entusiastas del diésel , en foros y web de internet. Según el tener un rango de Tdc offset de -25° a -75° es más que nada para cumplir normas de emisiónes federales y para el usuario común tener marchas o idle suaves en ruidos de motor. Pero que si te dedicas al remolcado o off-road puedes sentir que el motor no es tan reactivó es decir el "punch" para el buen diesel que debería de ser asi que, si desea sacarle mayor rendimiento a tu 6.5L puede elevar tu TDC offset de -75° a -1.50° todo lo que este dentro de éste rango estará muy bien.(usted entenderá 1mm= 2°😌) Y si estás muy loco, te sobra el dinero para reparación y tienes un exelente sistema de enfriamiento de aftermarket (porque los radiadores originales están muy limitados para desechar todo el calor del motor) Puedes elevar tu TDC offset hasta -2.20° como Máximo. ( En mi caso, situación que yo NO haría 😱). Dr.Shock Le pregunto a usted en una posición neutral, porque entiendo las reglas, son las reglas y hay que ser profesionales porque así lo dicta el manual. Pero fuera de eso usted que sabe?, sus compañeros que le an contado?, que opina. PORFAVOR escríbeme en su idioma natal( por su atención), ya que e visto en otros vídeos suyos que tiene la atención de contestar comentarios en otros idiomas, y son pocos las personas norteamericanas así. Gracias y buen dia.

@DrShock 3 жыл бұрын

Thanks for the comment. Yes, you can use a Tech2 to set the TDC offset such as I did in the linked video changing the CKP sensor. But if it does not fall in within spec you have to manually adjust the pump to account for whatever drift or wear prevented that, which this video addressed. Yes, having the TDC outside of the factory service manual spec will give you more performance but it will also give you harder starting and louder chattering in North American Winters ;-) so I'm not a fan. Gracias por el comentario. Sí, puede usar un Tech2 para establecer la compensación de TDC como hice en el video vinculado al cambiar el sensor CKP. Pero si no se ajusta a las especificaciones, debe ajustar manualmente la bomba para tener en cuenta cualquier desviación o desgaste que lo impidió, lo que se abordó en este video. Sí, tener el TDC fuera de las especificaciones del manual de servicio de fábrica le dará más rendimiento, pero también le dificultará comenzar en los inviernos de América del Norte ;-), así que no soy un fanático.

@jmacedo7 3 жыл бұрын

@@DrShock Agradezco mucho su respuesta. :-) y como una recomendación a su canal de video tutorials, hay una función en el scan tool tech2 llamado: " cylinder balancing " que me a llamado mucho la atención y que en foros de Internet se habla muy superficialmente. I would like saber si usted ya a hablado de este tema en algunos de sus vídeos, y si no! hablar del tema, saber si se recomienda hacerlo y bajo que circunstancias, y algún otro detalle mas, verdad. gracias por su atención. y que se encuentre usted bien. saludos

@DrShock 3 жыл бұрын

@@jmacedo7 Todavía no he hecho un video sobre el equilibrio del inyector de combustible. Soy de la escuela de pensamiento que sin un código DTC u otro síntoma de capacidad de conducción, como un fallo de encendido o un golpe, esto no es algo a seguir. Esta prueba Tech2 es solo para aislar un cilindro en particular que contribuye al problema observado, no como un elemento de mantenimiento regular. I have not yet done a video on fuel injector balancing. I am from the school of thought that without a DTC code or other drivability symptom such as a misfire or knock, this isn't something to pursue. This Tech2 test is only for isolating a particular cylinder contributing to the observed problem not as a regular maintenance item.

@boxea0011 3 жыл бұрын

Juan macedo tengo un problema con un motor 6.5 instalamos un motor completo completamente reconstruido pero no lo podemos encender este ajuste si no es el correcto puede afectar el encendido

@jmacedo7 3 жыл бұрын

@@boxea0011 @heri sanchez que tal: nunca me llegó la notificación solo porque pase por aquí buscando algo fue como me topé con tu comentario no olvides poner @ seguido del username para ser notificado. Con todo respeto para Sr. Shock Porque yo no soy experto como el. Y en tu situación entiendo la Barrera del idioma. Veo que pasaron 15 días. Desde que me preguntaste ojalá ya hallas solucionado tu problema. La verdad no das muchos detalles Cuando reconstruistes el motor. Son nuevos o preparado los inyectores como bomba o sólo los trasladastes Hay muchas cosas que debes considerar como: cadena de tiempo, marcha(si es lento el giro no generará temperatura para la ignición) Bomba elevadora de combustible. Si estas aquí en este vídeo es porque deduces que el problema está en área de la Bomba de inyección, pensando que está todo bien y que al reparar el motor sincronizaron engranes la bomba al quitar debieron de poner una marca, ya que el DIESEL es muy delicado con los tiempos de inyección + o (-) ya que moverlo más 22° o 25° de su tiempo base, haras que muy difícil su arranqué o nulo y olvídate si brincaste un diente de engrane. Te recomiendo que aflojes los 3 tornillo de la bomba y lo centres en medio de la bomba respecto a los ajustes. Después consíguete un Scanner ya se el original tech 1 o 2 o clone(vectronix) o esos americanos o asiáticos de gama alta como snap-on, launch o autel (son caros) Primero ajustes el tiempo base "adj. Time pump" que debe ser fijado a 4° y después viene lo bueno(y que no tiene ningún code fault) y sólo los Scanner buenos o ya mencionados te va ajustar "Tdc offset" y el ajuste es tan fino que no pasa se un milímetro el recorrido y que en este vídeo te puede enseñar Con el Sr. Shock y los grados de tiempo ya mencionados en los anteriores comentarios. Aquí en México hay poca información ya que no fueron muy comerciales estos motores( aunque se hayan armado aqui en Silao🙃) Y para ya no andar molestando al Dr.. shock sobre preguntas muy básicas. Y A lós demás usuarios se los digo Les dejó mail comkaller Hotmail .com y mucho de mi conocimiento en este motor fue porque hice mi tarea y sólo porque cuento con esta motorización como te decía aquí en mexico zona centro y sur, te cobran practicando con tu vehículo, no sabes tú lo que tuve que pasar y las puertas que tuve que tocar Y mucha tarea de auto-enseñanza, tampoco soy niofito en el asunto tengo carrera eléctrica conozco de motores diésel desde joven trabaje con Perkins fase 2 y el 904 de Mercedes por el trabajo de mi padre. Y Uno va atando cabos. Yo lo único que les puedo recomendar es que empieces investigando en foros americanos que son entusiastas de DIESEL. La información no abunda pero la HAY. Hay que dedicarle el tiempo hasta apenas estoy viendo video-tutoriales como el youtuber Dr. Shock se están animando a subir. Pero lo mejor es que lean y de ahí hasta encuentras diagramas. Estos motores no son malos tienen su limitante pero bien cuidado no te dará problemas y si cuentas o piensas adquirir vehículo inferior año 2000 te toparas que este es de los mejores, (bajo consumo de combustible y refacciónes baratas.) No te mentire es el más burrito comparado con el power stroke o Cummins, pero para usuarios básicos, son más las ventajas que desventajas por lo ya mencionado. Ahora comparado con motores de gasolina cambias a un diesel. Créeme es otro mundo, es lo MÁXIMO (siempre cuando lo tengas bien mantenido y con la conciencia de no contaminar)

@tombaker2523 11 ай бұрын

I've had to change out two new motors that had issues and tearing down I didn't have to deal with the bolts for the pump to gear behind the timing gear cover, I'm installing a new pump and now have to try and go thru the oil filler tube any suggestions on going about this. Any suggestions would be greatly appreciated,top notch video taught me a lot thanks

@DrShock 11 ай бұрын

Best tip for those bolts behind the oil fill tube is have a cardboard paper towel core, cut it down and use that as a shield to prevent dropping any of those IP bolts into the timing chain area while removing/installing them.

@denisfrancoeur5590 3 жыл бұрын

I did enjoy watching. I have the same year one and just had a mecanic to change the injectors 3 weeks ago. Since my motor is running great but starts right away when cold and does not when sits 15 min. until cool down . had no problem before. been told to change the pump. could it be just to time ? Denis

@DrShock 3 жыл бұрын

For what the video is covering, a Tech2 or MDI scan tool will tell if the engine needs a TDC offset adjustment so you don't have to guess about it. If you refer the video that this one links to, I show the initial scan tool procedure that led to having to do the timing offset adjustment after replacing a crankshaft position sensor.

@denisfrancoeur5590 3 жыл бұрын

@@DrShock Thank you very much and again was a nice video to watch. Denis

@deutzdriver1 3 жыл бұрын

Very good video, thanks for that. I have changed my injection pump, is that the only thing I have to do? It is running on -1.41° Thank you from Germany

@DrShock 3 жыл бұрын

Whenever you replace the pump you need to set the timing using a Tech2 or equivalent tool as well as the TDC offset. That -1.41 TDC offset you have is not within the service manual spec for a 1996 and up (-0.75 would be the outer boundary) as shown at 13:59 but its up to you if you want to leave it where you are (lots of forum opinions on that but I prefer to do things the GM dealership way). Here's a video specific to setting the injection pump timing - kzfaq.info/get/bejne/fM-iZJt90ZvQY4U.html

@kzkrg906 Жыл бұрын

Good day. I have problems with Hummer H1 (Injection pump). How can I show your video about it. I need your help in understanding the problem.

@robertfisch4603 3 жыл бұрын

Point of refrence ; the camera is filming from inside the engine compartment facing OUTWARDS towards the radiator.

@walkingeagle6237 3 жыл бұрын

So, I've got a 2001 with the 6.5L, just replaced the crank sensor and with a Tech2 scan tool the TDC offset relearn keeps coming back at about 2.20 degrees (positive). I check the injection pump timing and it is about 3.3 degrees average (super close to 3.5 degree spec). If I adjust the pump to get the TDC offset within spec then I will throw off the injection pump timing wont I?

@DrShock 3 жыл бұрын

Setting aside missing the steps of the Tech2 dance that can cause the relearn not to trigger at all, like I show in the video these TDCO adjustments are extremely small. Measured in a mm or so and within a specific +/- range the service manual calls out. This TDCO is something I would only expect to fall out of spec after two decades + from steel timing chain stretch in the normal just changing the CKP sensor out case. My understanding from the GM service manual is that as long as you don't stray from the range given, you won't affect the overall timing. Setting the base time on a 6.5L is a different Tech2 procedure, though still the mechanical steps with the pump. Still, if you have a situation falling outside the video I've done, you may want to get some other opinions first to be sure as setting the base timing is not something I can comment on.

@michaelmounts1269 3 жыл бұрын

great video...question: It looks almost like you have an EGR...so this is a VIN “s”...??

@DrShock 3 жыл бұрын

Nope, no EGR. This one is a VIN "F". Just that by 1999 and on the OBS SUVs things were very cluttered in that area.

@joestone2068 2 жыл бұрын

I would love to have a manual like that where on earth did you find it? And also those two wrenches do you have numbers for those renters and where did you find those. Great video thank you so much Joe in Vermont

@DrShock 2 жыл бұрын

Thanks, you'll find that kind of info in the video description text.

@ronbenson4793 Жыл бұрын

Great video well explained thanks for sharing. I have a question I look up the GM Tech 2 and says it's only for cars no trucks I'm cofused. I want to purchase a scanner Thanks

@DrShock Жыл бұрын

Thanx. Not sure where you're reading that false trucks statement, but it would definitely be in the _fake news_ category. The Tech2, like the Tech1 that preceded it, was the one and only scan tool used by GM dealerships exclusively thru 2008 for *both* cars AND trucks and used in conjunction with GM's Techline Information System 2000 (TIS2000) Windows based software. In 2008 GM introduced the MDI scan tool, which along with the MDI 2, is the current gold standard for GM dealerships in conjunction with the online Techline Connect internet based software. I have done some Tech2 and MDI reviews on this channel in the past you might want to check out before making your purchase there too.

@ronbenson4793 Жыл бұрын

@@DrShockIt Can Only Support 12V Cars, No Trucks thats what it reads on the description on ebay

@DrShock Жыл бұрын

Sounds like some poor Chinese to English translation there. Definitely in the fake news category. As you can see, this video is about a _truck_ and we're using a Tech2 clone on the _truck_ ;-)

@repsolrida 2 жыл бұрын

Hello.I love your videos. I was hoping you could help me with a problem. How could I check if the fuel injection pump is my problem? Truck start right up. But after accelerating for a while or driving it, it has no power. Or starts shutting off.

@DrShock 2 жыл бұрын

These sort of problems are incredibly difficult to debug over the internet, without physical inspection of the engine. Most likely fuel starvation though, imo. Could be multiple problems, including a PMD issue. Start with the starvation though. Some things you could look at are: - Connect a scan tool and determine if there are any DTCs to guide you - _Visually_ check fuel pressure at the "T" valve adjacent to the thermostat housing. Opening this T while the engine is idling should not cause it to stall (if it does suspect the fuel filter and/or lift pump). There should be a continuous stream thru the rubber hose attached to this valve, if a dribble the lift pump / fuel filter areas are again suspect. - Check fuel pressure with a gauge at this same T in place of the factory rubber hose outlet, you should see around 5psi, +/- 2psi. If these all check out, I'd start looking closer to the injection pump. Could be as simple as the fuel plumbing to the IP, or could be the IP itself. Again, not something one can debug over an internet comment board very effectively. ;-) Hope that helps.

@khills1181 3 жыл бұрын

Great vid Dr. Shock. I just replaced my injection pump and crank sensor. From what I have seen I have to set the injection pump timing to 3.5 degrees then perform the tdc offset. Not sure how to do this. Can you help? Mine is always stuck at 14-16 degrees no matter how much I turn the pump. Thanks in advance.

@DrShock 3 жыл бұрын

What I showed here was adjusting the timing for the top dead center offset (TDC offset). If you're installing a brand new injection pump yeah there's an initial timing step that needs to be done first. I've personally not had to do that procedure yet so cannot provide pointers on it. But I do know it also requires a Tech2 scan tool (or Tech2Win emulator) and there is a section in the GM service manual about performing it with the Tech2. My advice would be to just follow that service manual guidance with your Tech2. If you don't have one, I believe I have an eBay link in the video description where you can get a CD-ROM version of the manual(s).

@andrewsmart2949 3 жыл бұрын

engine manual or tech2 gives timing figures round wrong way,it shows advnce when its retardded and vice-versa

@DrShock 3 жыл бұрын

@@andrewsmart2949 No, the Tech2 is completely correct for its TDCO reporting. It's some of the aftermarket tools that do get the TDCO values incorrect. This video deals with TDCO only, but then there is also base Time Set (TS) which we did not cover here so I can't comment about TS. But GM has it correct of course in their tools and manuals for TDCO, after-all it's their technology ;-)

@andrewsmart2949 3 жыл бұрын

@@DrShock yeah well when i did it in 2008 none of that had been done and in countries where it wasnt readily avail it's not gonna happen

@lundyfan30 2 жыл бұрын

Awesome video. But couldnt the adjustment also be made by adjusting the optic sensor inside the pump?

@DrShock 2 жыл бұрын

No, the service manual is specific about the need for a scan tool to detect, and then communicate this manual adjustment to the PCM.

@cypresslawnlandscaping1998 3 жыл бұрын

My trucks TDC offset was -2.38. So I moved the pump to the passenger side of the truck. Now it just cranks but won’t start. Did I move it too far ?

@DrShock 3 жыл бұрын

Maybe as it's very easy to do that, hence how critical marking the original position. It's an incredibly small amount that you would be moving, like 0.5mm. What happens when you put it back to the starting mark you made?

@AntonioMendoza-sw1un 3 жыл бұрын

Great video I have a question what another scanner can I used? to read the tdc and the coolant temperature rather than the gm tech 2

@DrShock 3 жыл бұрын

You could also use a GM MDI, or a clone of one. A GM MDI2 (no real clones of this just fake MDIs in an MDI2 case). You could also go with any J2534 tool compatible with GMs Tech2Win program available at www.acdelcotds.com

@RussellRowell1 3 жыл бұрын

The snap on mt-2500 reads TDC offset and Desired and actual timing on my 97 gmc savana 6.5. It has a program called troubleshhooter that states that the actual timing should be set before setting the TDC offset. I realize this is an old scanner. But it has some bi-functional controls like turning on lift pump and glow plugs/controller. It read my tranny and abs. I bought it for my 94 grand cherokee and found out it works on my van also. I purchased it for under $300 too!! I know all this because the other day when I got home. My van just started clattering super loud. At first I figured a bad injector. But going the cheaper route first. I'm hoping it's the injector pump stepper motor that controls pump timing. Odd thing is my van will start and idle but the TDC offset reads -4.0. I don't see how it's even running. The desired timing is reading 10.5 degrees while actual timing reads 25.5 degrees. I prey the stepper motor will fix my problem. Anyhow, I was just outside with the mt-2500 hooked up and was surprised to see that info available. Go snap on!!

@RussellRowell1 3 жыл бұрын

Also, the mt-2500 will step you through setting the timing on the pump with the troubleshooter program I mentioned just like Dr Shock shows with holding the throttle at WOT for 45 sec and so on.

@DrShock 3 жыл бұрын

@@RussellRowell1 Thanks for taking time to share about your Snap-On tool. Good to have multiple choices for tools on these 6.5L engines.

@mtebaldi1 3 жыл бұрын

What Manual did you use to get the information on the TDC. Would like to purchase one for my 6.5 my truck is a 95 though.

@DrShock 3 жыл бұрын

Thats the 1998 GM service manual for C/K trucks. They are out of print now, you usually get the manuals from Helm (info in the back of the owners manual) www.helminc.com/helm/search_service_owner.asp?Style=helm&class%5F2=CHV but I do see someone made a PDF of it here www.gmt400.com/threads/88-95-service-manuals.43575/ or you can buy one off eBay at this affiliate link ebay.us/z5cENd

@freezepop6389 Жыл бұрын

Hello, I have a 2000 Chevy 3500 short school bus with a 6.5 diesel turbo. Recently I replaced the fuel injection pump. It is running but sometimes when I am at a stoplight for no reason at all it will act like I've jolted the gas pedal, sometimes it sounds like it's going to die but catches itself before it happens, and it seems to take just a little bit to start up. Would a TDC relearn/ injection pump adjustment solve these problems? Also I am getting around 9 mpg do you think that will improve as well?

@DrShock Жыл бұрын

For a surge like that, I'd first suspect the pump mounted driver or PMD. This is a small electronics module mounted on the LH side of the injection pump, or more preferably remotely elsewhere in the truck. If you got a new rebuilt injection pump, it should have came with a new one of these PMD modules and be under warranty for you.

@alexandernadauld3720 3 жыл бұрын

I am not getting a code a to relearn, and also when I rotate my pump it doesn't change any values in GMTDscan. any ideas of what's going on?

@DrShock 3 жыл бұрын

First you have to be using a GM Tech2 scan tool, or a J2534 tool that supports running the GM Tech2Win application on a laptop. Aftermarket scan tools _might_ work, but at best they typically won't give the same timing offset value range as the GM service manual so you'll have to manually translate/convert them. Second, as I showed in the video this is a very specific procedure (aka dance) with the scan tool and if you don't follow the service manual instructions _exactly_ it won't go into TDC offset relearn mode. The dance with the key on, accelerator pedal down, and the wristwatch time durations around all that have to be held to a no more no less kind of approach. It may take a couple of attempts, it does even for me, but it will relearn if you have a Tech2/Tech2Win tool. Lastly, you won't see anything rotating the pump alone, you have to get the PCM to enter relearn mode to pick up a new TDC offset otherwise the scan tool will just be given the stale old value over and over. This is why this job really is impossible to do without a scan tool. Folks think they've done it without one, but screenshot or it didn't happen I say. ;-)

@alexandernadauld3720 3 жыл бұрын

Thanks so much! I was using a free c Version that just reads small codes, i purchased the real deal and I will give it another go!

@texassingh1027 Жыл бұрын

Thanks for the information. Trying to do this on my humvee. Where did you get the rotating tool from?

@DrShock Жыл бұрын

Links are in the description for the tools I used.

@texassingh1027 Жыл бұрын

Thank you. The information you have presented is really well done.

@Varietystudios897 8 ай бұрын

What scanner are you using to check the timing of the pump?

@DrShock 8 ай бұрын

It's in the video, a GM Tech2

@Croiseeman 2 жыл бұрын

DrShock was a code given on the dash that the timing was off, Or was it a new injection pump you installed?

@DrShock 2 жыл бұрын

It's a procedure that also has to be reset whenever the crankshaft position sensor is replaced.

@Croiseeman 2 жыл бұрын

@@DrShock thank you.

@creeplife2802 3 жыл бұрын

What brand fuel filter is that? Where's the black plastic cap

@DrShock 3 жыл бұрын

Not exactly sure what you're asking about as we're not working with the fuel filter in view with the focus of this video. We're looking primarily at the injection pump housing attachment area at the front part of the engine. The fuel filter housing would be to the rear of the engine. Perhaps you're asking about the cylindrical fuel shut-off solenoid showing in this view? Regardless, the answer is I always use a ACDelco brand filter inside a genuine GM filter housing and _separate_ locking ring that secures the black plastic cover.

@cumminsmilitia2063 2 жыл бұрын

mine is at -0.43 is that ok because I feel a slightly miss fire and loss of power.

@DrShock 2 жыл бұрын

I don't recall the range off hand, but it is in the video where I show a shot of the service manual page for same.

@marioknowles3376 10 ай бұрын

Is this the same thing for the 93 with a mechanical pump.

@DrShock 10 ай бұрын

No, this procedure would be for the electronic DS4 type only.

@ronaldschoolcraft8654 2 жыл бұрын

I have those tools, but I've found that a ratcheting end wrench works better.

@ronaldschoolcraft8654 2 жыл бұрын

They run better at -1.94 TDC offset... In 2004, dyno testing on my old Suburban showed that changing from -.7 to -1.94 increased power by 4 hp and torque by 9 lb-ft.

@DrShock 2 жыл бұрын

Yeah but going that far its alot louder running, and cold winter starting is degraded. The stock tune is more balanced for all seasons, less emissions, and of course less noise.

@ronaldschoolcraft8654 2 жыл бұрын

@@DrShock I run 17:1 compression with reprogrammed glow cycle and have good winter starting. Everything is better at -1.94 TDC offset. I have also revised the timing tables. Of course, I build these for performance and have splayed main caps and many other improvements.

@thumper580 Жыл бұрын

To move the injection pump do you have to loosen the eight injector lines that are attached to the back in order to move the IP?

@DrShock Жыл бұрын

For these small adjustments in timing, such as for the TDC offset, no that wouldn't be necessary. You'll be working within only a mm or so range of movement in most cases. Well within the _play_ of the connected lines.

@thumper580 Жыл бұрын

@@DrShock I have a 2000 military hmmwv with a 6.5L NA diesel. It has the db2 IP. It has a hash mark on the IP flange and on the timing cover. Normally they line up.... My IP is 3/16-1/4" retarded.. Seems odd. I wanted to loosen it and line up the marks and see how it runs and go from there. I didn't want to torque the injector lines.

@DrShock Жыл бұрын

I'm not familiar with the DB2 setup, but certainly on the DS4 a scan tool like a Tech2 would be a must have to dial in the timing.

@markharrison3039 Жыл бұрын

I'm more concerned if the tight injector lines can handle 3/16-1/4" rotation of the IP without over stressing them. The bd2 is mechanical and I have the instrument to check the injection pulse. Thanks

@DrShock Жыл бұрын

If you have to move it that far, you _may_ have a problem and need to loosen the lines temporarily. For this video, just resetting the TDC offset, you would not normally be moving out side of a 1-3mm range so no problem.

@codyknight5079 Жыл бұрын

I did the relearn the other day and is 14° advance good or bad

@DrShock Жыл бұрын

I'm only covering the top dead center (TDC) offset timing adjustment in this vid, not setting the base timing. I don't recall offhand what the TDC offset range of good values was, but I do show what is printed in the service manual during this video a few times. The TDC offset is going to be LESS than 1 degree maximum across the good range. It's a very small fractional value range.

@richarddool3238 Жыл бұрын

Hello sir I watched this video and can u tell me what is the name of the book ur showing I like to get one I have a 1994 chev 2500 with 6.5 t diesel thanks neil from canada

@DrShock Жыл бұрын

That would be the GM factory service manual. They've been out of print for like 20 years, but they occasionally pop up on the link I included in the description for this video.

@MsWesly1122 8 ай бұрын

I looked up that book for the truck using the link you had but it showed different ones, can you tell me exactly which one you used. Please and thank you

@DrShock 8 ай бұрын

If you are referring to the special wrenches, there are several brands out there as mentioned. Being fixed purpose wrenches, they are all going to fit. But I used the OTC set for the S wrenches, and the Sunluway for the adjuster.

@MsWesly1122 8 ай бұрын

@@DrShock no im referring to the book you used I looked it up on eBay but there’s multiple books so I was wanting to know if you can send a picture of the front of the book ?

@DrShock 8 ай бұрын

Those GM books are model year specific, so you use the one for the year truck you're working on. In this video, we were using a 1999 edition of the book.

@MsWesly1122 8 ай бұрын

@@DrShock ahh ok mines a 98 but I guess the question would be is there a certain volume number of book to look for or is the book just tilted 98 c/k service manual cause there was so many books on eBay

@DrShock 8 ай бұрын

These old body style (OBS) C/K truck manuals are 4 volumes (4 books). The 6.5L diesel info is going to be across at least two, three if you include electrical diagrams and debugging. I don't recall off hand which specific book had the timing info I showed for that model/year. If you can't find one of the out of print hard copy books from the links in the video description, you can _rent_ access over the weekend from ACDelco at www.acdelcotds.com using SI (Service Information).

@rocket998 Жыл бұрын

Can you tell me if the actual timing changed. In the first video it was running at about 10.6 and this video you didn’t scroll down to see it

@DrShock Жыл бұрын

The original incorrect TDC offset is shown in several segments, within the first minute and again a few times within the first 27 minutes of the vid. As mentioned 32 minutes into the vid it's a very precise dance to get the offset relearnt and may take a few attempts, but it's shown within spec starting at 33:22

@rocket998 Жыл бұрын

My question is when you changed the offset did the pump timing change? @.21 it shows 11deg and the first video shows 10.6. I understand you are focused on offset, however I am focusing on all the information of the tech 2. So it seems when you advanced the offset the pump timing would decrease. If so how much did it change.

@DrShock Жыл бұрын

Right, we're only focused on resetting the TDC offset in this vid which remains constant once set. The actual engine timing, on a 1997 and later design 6.5L, is going to change within the Tech2 view during a given run so you won't see a fixed value. This will come from both the PCM making frequent electronic timing adjustments, which includes the TDC offset value, and from the flex effects caused by timing chain wear. I would expect to see the value _float_ from run to run, but remain within service manual specification. If not, then there's a whole different procedure for setting the actual initial engine timing with the Tech2 covered here kzfaq.info/get/bejne/fM-iZJt90ZvQY4U.html

@robertquinn6488 Жыл бұрын

I have replace my injection pump on my 1995 C3500 HD. With the truck being OBD1 I was told by a friend that the Tech2 scanner will work with my truck. I had picked one up on Ebay. My problem is the Tech2 that I bought has a software card for OBD2. I have been trying to find the software card and not having much luck. Would you know of any other scanners that I could use? I know there the Snap On brick scanners. But you have to have the right key cards and software. I have checked with a few local shops as well but no luck. Thanks Robert

@DrShock Жыл бұрын

There's no software card issue like that with a Tech2. Perhaps the person is recollecting how the Tech1 worked. With a Tech2 the memory cards are only for non North American brands like SaaB or Isuzu. The regular North American brands, which would include the Chevrolet and GMC C/K trucks are all on the one card. What you do _might_ need is the OBDI connector for the end since yours is before 1996. The Tech2 kit should have come with several different DLC connectors. Very few to none of the aftermarket scanners are going to have 6.5L TD offset functionality. I have a Tech2, but in this video I showed the manual method because most folks won't have one.

@robertquinn6488 Жыл бұрын

@@DrShock I have the Tech2 OBD1 connector but it's not communicating with my truck. I have 2001 6.6 Duramax and the communicate with the Tech2. With the 1995 Chevy 6.5 diesel. I can hook up a code scanner and it will communicate with the truck. I get nothing out of the Tech2. I will check out your video on the Tech2. Thank you and have a good weekend! Robert

@DrShock Жыл бұрын

Does your 1995 have the OBD1 or was it a later build that included the OBD2 connector? What is the version number of the Tech2 firmware when it boots up - it should be North America Operations version 33.004. I've used that version on several 1994 and 1995 era trucks and a clone Tech2 (not even the genuine tool).

@robertquinn6488 Жыл бұрын

@@DrShock I just went out the garage and checked. That's what I have North America Operations version 33.004. It' will not connect to my 1995. My code reader works fine. I can check engine codes and ABS with no issues.

@robertquinn6488 Жыл бұрын

Please disregard. I have found the North America Operations version 33.004. I see different versions. I am not sure what the difference is?

@samsara2024 4 ай бұрын

I have the 6,5L from 1995, My engine does not look exactly like that one. What differences I need to know?

@DrShock 4 ай бұрын

The approach for timing prior to 1996, prior to full OBD2 adoption, differs. You would need to verify in GM service information / service manual for the details though.

@samsara2024 4 ай бұрын

@@DrShock i feel this: its like i am presing the gas the and the engine take some time to speed up and push. Its like delay effect. Any idea? :)

@DrShock 4 ай бұрын

Reading out any trouble codes is where I would start. But it may still be that whatever you are experiencing is within tolerance enough that the PCM isn't complaining yet. Unfortunately this sort of symptom could be due to more than one cause. Not something you'll be able to easily diagnosis over a chat forum imo. But if no codes, I would next check fuel flow rate for a fuel delivery obstruction to eliminate clogged fuel sender sock or fuel filter. If RPMs are responsive to accelerator pedal position, and the transmission is an automatic, then I would more likely go with delayed engagement problems in the transmission instead.

@samsara2024 4 ай бұрын

@@DrShock Thanks a lot for your answer. I only have error code 35. Sorry about the questions, but I am writting you from Madrid, Spain and there is no garaje here that knows about these old american diesel engines. So I am very alone trying to fix mine :)

@DrShock 4 ай бұрын

A code 35 on the 1995 and earlier PCMs is going to be a fuel injection pulse width being out of specification. Still a lot of causes, but at least the code localizes you to the fuel delivery system. Verify your lift pump is operating correctly fuel flow wise, and that the fuel filter is not restrictive (i.e., past the change interval). If you have a spare PMD, this would be a condition where swapping could save alot of diagnostic time. On the 6.5L engines with the DS4 injection pump throwing any sort of fuel delivery code, the PMD module is often worth checking first. Worst case though, it can be a problem with the DS4 itself, such as a faulty optical fuel sensor internally.

@craigjones9267 2 жыл бұрын

Hi. Where can I get thoes manuals. Please.

@DrShock 2 жыл бұрын

Links in the videos description section.

@Tadas585 2 жыл бұрын

Hello guys I have a problem, maybe someone can give me tips Setting the Timing arround 3.5 degrees. It' jumps from 3 to 4 degrees. The lowest i get is -2,02 the last try is -2,45 Please someone could Help me? Where is the problem?

@DrShock 2 жыл бұрын

If it's a 1996 or higher, how does the timing chain look? Jumping around like that, presuming the pump bolts are at the right torque, I'd want to check that for stretch.

@alejandrorios4477 3 жыл бұрын

I have a 93 6.5 just replaced injection pump but I’m having trouble shifting after 3rd gear would changing the injection pump have anything to do with that?

@DrShock 3 жыл бұрын

I haven't ran into anything like that personally. And a few years ago I would have not thought there was even any relationship, presuming the pump was properly timed. But I did read awhile back an article from a transmission rebuilder (Atra) talking about 4L80e shifting problems that ended up being caused by a defective optical sensor on the Stanadyne injection pump. It pops up on Google if you search for it. Not suggesting this is your issue at all, just confirming that yes there can be transmission side effects caused by injection pump issues, though I would suspect they are on the rare side.

@troyfrederick8048 3 жыл бұрын

My 98 1 ton with 4l80e wasn’t shifting into overdrive and was thinking something was going on with the transmission. Was driving it a couple days like this and all of a sudden the truck just died like someone just turned off my ignition switch . I always carry an extra pmd and already have a relocate done, so I swapped it out, my truck cranked right up, and it once again shifted into overdrive again. Great videos!

@oscaredwards100 2 жыл бұрын

Where do I find the tools for this job? Thanks in advance.

@DrShock 2 жыл бұрын

Links are in the description.

@oscaredwards100 2 жыл бұрын

@@DrShock I’m new at and can’t find description.

@DrShock 2 жыл бұрын

If you're viewing KZfaq on a PC or Mac or iPad using Safari, then the description is located right below the like button row. If you're on a smartphone or iPad using the KZfaq app, then it's located by tapping on the down arrow next to the video title above the like button row.

@oscaredwards100 2 жыл бұрын

@@DrShock thank you so much. Found them. About to replace the ip on my 1998 c3500 so I’ll probably have more questions for you when I’m into it. Keep up the good work you are a good teacher.

@humbertoesteban603 2 жыл бұрын

Whts the exact name for your scanner??

@DrShock 2 жыл бұрын

I'm using the same type of tool that the GM dealership technicians used back in the 1990s. A GM Tech2. There's a link in the description where you can search for an used one, or a new one, in the description text section of this video.

@Rideandshineco 3 жыл бұрын

Where is your shop located sir?

@DrShock 3 жыл бұрын

Don't have one, just my hobby/side gig being an engineer by trade. ;-)

@clarencepipkin2022 11 ай бұрын

id bring my truck to you if you ate still doing side work. truck fires right up and drives great but i do have code for inj pump timing. i installed this used motor and have driven 10 miles on it so far

@PATTY_6.5 Ай бұрын

94 and up

@DrShock Ай бұрын

It turns out the Tech2 procedure is _not_ the same for pre-1996 so based on feedback I removed 1994 and 1995 some time ago. But yes, other than the scan tool part the rest would be the same for those two pre-OBD2 years.

@andrewsmart2949 3 жыл бұрын

the manual i had had wrong figures for timing offset,when it gave an advance figure it was actually retarded same amount,other than that it wasnt hard

@DrShock 3 жыл бұрын

There are problems reported in several forums with aftermarket scan tools, e.g., Snap-on, and others getting the TDCO values wrong on these 6.5s engines. And some of the non GM service manuals also have gotten TDCO values wrong. But the genuine GM factory service manual I showed here, and the GM Tech2 scan tool (clone or genuine) with all the current firmware updates applied thru 2013, are completely spot on for TDCO. There's also the differences between TDCO and base Time Set or TS. These both have to be right for the timing to be correct. But this video only covered TDCO.

@macncheese1991 Жыл бұрын

So it can be done without a tech 2 but it would be like shooting a fly with a bb gun

@DrShock Жыл бұрын

Yeah, it would be a pisser. You could use a newer scan tool, like any J2534 compatible one along with the _weekend_ subscription at www.acdelcotds.com for Tech2Win (a Tech2 Windows emulator) and that would do the job from your laptop.

@zusclhz 9 ай бұрын

Thank You SO MUCH for Teaching 🙏🚂🎼🌹🎶🎵🛠⚕️ ~C< 3)>>-Z->}

@colestaples2010 3 жыл бұрын

Now how to time a pump when it won't start 🤔

@DrShock 3 жыл бұрын

You might try the service manual procedure for setting the initial timing alignment as you would with a brand new pump installation, to at least get close enough for it to start.

@chupacabra1765 6 ай бұрын

It's strange why Gm used metric fasteners. For the most part the US is not a metric friendly country. Also ive heard many suggest tossing the engine beauty cover as it traps heat in the valley of the block. A place that has been stated by 6.5 gurus gets hot enough as it is.

@DrShock 6 ай бұрын

All US automobile manufacturers began moving to metric fasteners in the late 1970s. GM started in 1977, for model year 1978. Remember US companies export and sell vehicles to other countries and metric would be required to do so.

@singlended 10 ай бұрын

Where could I get a used '94 6.5L turbo intake manifold with EGR (or with EGR cover plate) pls?

@hugoetorres3737 8 ай бұрын

Sorry, I'm quite interested in the information. I have a 1997 diesel and I haven't been able to get it to work. I would like to know what part of the USA are you located?

@frontspring1 3 жыл бұрын

Gotta step it up to the new milwaukees.

@arlenjensen8912 2 жыл бұрын

Leroy's Diesel has a temp cheat tool to plug it the temp sensor to cheat to 180° so you dont have to warm it up. Check there page.👍

@bryanst.martin7134 Жыл бұрын

@9:20 : were those the same engineers that designed the PW R2800? Great motor, lousy design...

@nickthecarguy3016 2 жыл бұрын

I need to set timing on my 97 Tahoe 6.5. Is there a scan tool you recommend I can buy to get the job done?

@DrShock 2 жыл бұрын

There's a link in the description for this video on the one I'd recommend.

@richarddool3238 Жыл бұрын

That is setting injectin pump timeing

@DrShock Жыл бұрын

This video is about the GM service manual procedure to adjust the TDC offset for 96 and up using the Tech2. It does require a pump movement, but it is not the same as the base timing procedure. I cover the injection pump time set in this video kzfaq.info/get/bejne/fM-iZJt90ZvQY4U.html