Nicely done. These TBI 350s still deserve to be fixed and stay on the road. When the small things that do go wrong with these are addressed, they run amazing.
@allenbowick47163 жыл бұрын
Thank you so much for your video, I had damn near the same problem with my '90 k1500 325,000 that my dad bought new. Your vid is the most accurate, right, correct diagnostic out there. I finally broke down & bought a new fuel pump. When removing the old I found a 3/8x1/2 or so piece of plastic grocery bag that somehow got around the sock & was hung up in the pump and cause intermittent fuel pressure problems. You sir have a new subscriber.
@mrmiller616694 жыл бұрын
Excellent video, very thorough. I have the same year, make and model truck with the same exact symptoms. I have been scratching my head on this one but now have something to go on. Thanks!
@mrmiller616694 жыл бұрын
Steve, I am so glad that I came across this video! As I explained in a previous post, I have the same year, make and model of this truck with the exact symptoms. In completing the fuel pressure test, that I was reading 9-9.5 PSI. I then completed the dead head pressure test and it only measured at 12-12.5 PSI. I replaced the fuel pump about 3 weeks ago using the tilt bed method and I am very happy to report that I've not had a problem since! Thanks!
@corey63933 жыл бұрын
Came in here to say that your video helped me finally solve my issue. I am in the middle of a long road trip, and my truck began to act up. Acted like a vacuum leak, but not entirely. Rough, surging idle when cold, high idle when warm, stumbling and hesitation under load, etc. I decided to cut an access hole in the bed, and swap the pump. Bingo! That 3" section of fuel line between the pump and the metal riser pipe had a split in it, effectively acting as a pressure relief. Enough pressure to run, but just barely. If it weren't for this video, I likely would not have figured it out. Thank you very much for this posted video. So, after doing a ton of research, I also want to share my EXACT specs for cutting the access hole. 1991 Chevy Scottsdale, K1500, standard cab, 8' bed, 35 gallon fuel tank. Measure 10" and 27" from the left side of the bed, and 4" and 19.5" from the front of the bed. The hole will be the perfect size, and the fore and aft cuts will land on the frame rails underneath for support, and they should also cut through the few spotwelds that need to be cut to peel that panel out of the way. I just used self tapper screws to reinstall, and some metal duct tape to seal it off. The truck has never run better. By the way, this truck has only 65K on it. It spent some time sitting in a barn, which may have hastened the split in the fuel line. Thanks again for the video and info. Hope my post can help another someday.
@wildestcowboy2668 Жыл бұрын
Why not remove the bed? It's 6 bolts
@corey6393 Жыл бұрын
@@wildestcowboy2668 In the middle of a 3K mile road trip, doing the repair in my parent's driveway. Basic tools, no hoist, no help with heavy lifting. Had I been home in my shop the process would have been different.
@wildestcowboy2668 Жыл бұрын
@@corey6393 just asked a question. Myself I've never been one to do a hack job
@corey6393 Жыл бұрын
@@wildestcowboy2668 Would you have towed it 1250 miles home, or waited two weeks for the local auto repair shop to charge you $1K for the job while you paid $80 a night for a motel room? I cut a very clean hole in the bed, did the swap, and sealed it back up. Clean, not hacked. Also easy access for the next time the GM fuel pump takes a dump.
@wildestcowboy2668 Жыл бұрын
@@corey6393 l always carry 2 things with me and ones my cordless impact. Maybe u didn't grow up in the country like I did. I think I could drop 6 bolts quicker than cutting a hole over a explosive gas tank. But again I just asked a question, wasn't trying to bust ya out or anything.
@loritobin25782 жыл бұрын
Today took out the sender and fuel pump and sure enough...had a small crack starting on the rubber hose between the sender and the fuel pump although it may or may not been all the way through. The fuel strainer was getting very discolored and the fuel pump itself was harder to spin, not spinning freely like it should. Glad I found this video as I ended up replacing the fuel pump and strainer. It took care of my problem and even runs better!
@WinnfieldCustoms3 жыл бұрын
I love my TBI trucks. Ive had hot start issues but it was too much fuel from a bad pressure regulator. also happened on my vortec with the spider injector assembly leaking fuel
@geraldbaker423 жыл бұрын
also seen ignition module causing problem. those modules can be tested at some auto parts stores free
@chetmyers70413 жыл бұрын
I had 1989 Chevy Impala Wagon with V8 and was experiencing intermittent ignition dropout. Replacing reluctor coil in distributor did not improve things. Replaced HEI coil and went thru several "thick film" modules in distributor. No improvement. Turns out, fan clutch was weak and underhood temps were high. New radiator fan clutch solved the problem.
@weshawkins71653 жыл бұрын
I’ve got a customers 1990 Chevy pickup with the exact same problem with the addition of stalling while driving and not restarting. He had the fuel pump replaced but I’m suspect of the replacement. I’m going to try and dead head the pump and see what pressure I get. Been dealing with this issue for a year. Didn’t suspect the pump because the customer said he had it replaced at another shop.
@weshawkins71652 жыл бұрын
What turned out to be the problem with this truck ended up being a problem with and aftermarket performance chip that the customer had added on to it back in 1995. It was reacting to hot temperatures inside the cab on hot summer days. It finally acted up on me and I did the wire wiggle and component tapping test.
@blairjosephbernard201111 ай бұрын
My tbi surge put good I put a new Fuel regulator / filter cap / rotor/plugs/idle air control. It kinda went away but still does it a lil bit. But never thought to check the sensor under the cap
@leonciorodriguezaguilera95132 жыл бұрын
Excellent Job Amigo !! Congratulations !!
@electricguysvcs2 жыл бұрын
I had that pin hole leak on the 4.3 engines. Great when they tank was full but rough when 1/2 full
@chasedroid49644 жыл бұрын
Excellent video very thorough thank you
@mattwertin4 жыл бұрын
my 1990 would sit idling surge and die.changed the module now it doesnt die but the surge is still there
@leonciorodriguezaguilera95132 жыл бұрын
Thanks a Lot For Sharing ...
@tomwolf46094 жыл бұрын
Awesome job
@rickyboyd29193 жыл бұрын
If you could describe where and how to pinch the return line on these trucks to do a deadhead fuel pressure test it would be appreciated. I’ve been living with this problem about 3 years now. I do have a snap on data box and a fuel pressure gauge kit for inline pressure.
@davidpatrick18132 жыл бұрын
Could we just take the line off the TBI input and dead head it there right away, first thing? I put on a new filter already.
@tinman71593 жыл бұрын
You dondt use dielectric grease under that ignition module computer boy.. you use heat dissipating gel, that get likes 200 degrees in that location..
@Tom-pn5sk Жыл бұрын
Who says
@XJon20114 ай бұрын
This is true. Says this in the factory service manual.
@loritobin25782 жыл бұрын
I have just started to deal with this same issue. Is it possible the fuel filter could be starting to get a restriction causing the fuel pressure to not increase by double as you stated? I replaced my fuel pump with a GM pump about 100,000 miles ago along with the fuel sender.
@chemmer1127 Жыл бұрын
What scan tool did you use to watch data ?
@paulbrunell38834 жыл бұрын
I have a 1993 silverado 5.0 runs good then decides it wants to stall , you can drive it 15 miles or more or for days then it just shuts off while driving .I have been to three shops nobody can fix it correctly .
@joshstrickland52574 жыл бұрын
Check your fuse box under the hood sometimes they lose connection underneath the fuse box push down on top of the fuse box
@tonyedward69093 жыл бұрын
@@joshstrickland5257 mass air flow sensor.
@denniscostantini4179 Жыл бұрын
Have a 94 gmc Sierra dies after runs for about 10 min real good then dies after trying to accelerate what’s do you think it is
@domingoperez81563 жыл бұрын
I have a 94 with s 454 after running for 10 minutes I gets s sudden pike in idle up to 1100 rpm what could that be
@tuffz7123 жыл бұрын
1100 isn't that high that's nearly normal
@domingoperez81563 жыл бұрын
Tuff Z71 I got it to come down the vacuum hose going to the map sensor was Collapsing after the engine would warm up I would heat the hose up and cause it to collapse in the idle to go up
@tuffz7123 жыл бұрын
My 94 350 is having issues like that
@domingoperez81563 жыл бұрын
@@tuffz712 ran s short rubber hose straight from the intake to the map sensor short enough to connect the two together
@bobkauppila18923 жыл бұрын
What is dead head pressure?
@larsmoservice5882 жыл бұрын
For the sake of others mine dead head over 100 psi with new Delphi pump. 1989 R3500 5.7 TBI
@Tom-pn5sk Жыл бұрын
Good question 🤔
@anthonyskorner45114 жыл бұрын
Ever watch scannerdanner?
@bar20bbq70 Жыл бұрын
Always.smartest tech on yt.
@Red-mf5uq2 жыл бұрын
Curious, did this symptom throw a code 32... egr
@richardm40724 жыл бұрын
1988 Chevy Silverado has hesitation also stalled now won't start back up
@randy1ization4 жыл бұрын
what would cause an 89 k1500 to surge on start up at idle. its very constant and replicated., like the com puter is doing it,? it also has to crank over for abt 5 to 7 seconds when first starting after sitting overnight. u have me thinking maybe the pressure is bleeding away due to a pinhole in the fuel line on the pump assembly. also how did u get to the pump, drop the tank or remove the bed. thanks
@tomwolf46094 жыл бұрын
Same problem..i was told to just lift the bed up to change pump...what a pain every bolt was so corroded holding the box down you could feel them starting to twist off when losining and also the back two by the bumper mount were impossible to get a socket on..didnt have a torch to cut em off so just dropped the tank...i spent more time fighting the box than it took to drop the tank..and oh ya..take a hose and wash the 30 yrs of dirt out before you start..haha..i didn't.
@brycelovell69843 жыл бұрын
Tom Wolf you should absolutely be able to get a socket on all 8 bed bolts. Only if you have an aftermarket hitch installed will the very back one be a pita.. they all have access holes through the frame tho...
@codybrooks93142 жыл бұрын
I just cut a hole in the bed the bolted a street sign over it when I was done changing the pump
@cotynietling25674 жыл бұрын
So i have a 1990 c1500 with 5.7 tbi i cant figure out here is a list of what we replaced, distributor, cap, rotor, spark plugs, wires, coil, temp sensor, map sensor, ecm, checked all wires, rebuilt throttle body, new injectors, new fuel filter new fuel pump screen and connecting hose, o2 sensor, catalytic coverter, thermostat, water pump, and belt. A lot of parts each one put on one at time and each time runs better it'll sit and idle then just die cant put it in gear without it dying, once driving it shutters. At idle engine shakes please help me figure this out got a LOT of money in this just want to drive it
@ribeye5373 жыл бұрын
Idle air control valve fixed mine
@rickyboyd29195 жыл бұрын
I have almost the exact same problem and I have checked my fuel pressure and it is also good but I have not checked a dead head pressure like you did. I have a 1995 K1500 Chevrolet Truck. I assume you pinched or plugged a line somehow to block it and read the pressure in that condition. Would you mind telling me how you did that so I can do the same? Great Video and almost exactly my really odd problem. I don't want to change the pump if not proven needed as it's tough to do I hear (remove bed) or do a lot of contortions to drop the tank?
@anthonyskorner45114 жыл бұрын
Might be able to do some snap throttles with a guage hooked up and make sure there is not excessive pressure drop. If you have a scope there are other ways possibly without using a guage. Look up scannerdanner on YT.
@rickyboyd29194 жыл бұрын
Thanks. I’ll hook up the pressure gauge and try snap throttles. My snap on mt2500 tells me the o2 voltage is .9+ at WOT so I’m thinking it’s not the pump but maybe vapor lock?
@thebull50994 жыл бұрын
Did you charge him for a fuel pump when u said his was ok. And you just fixed the pin whole in the line
@eloymartiz83493 жыл бұрын
GOOD SPEAKER, BAD TEACHER ;SOORRY ,BUT THE PURPOSE OF KZfaq IS TO SHOW PEOPLE TO DO THINGS?.......GOOD FILM CLEAR !.....GOD BLESS YOU.!!
@aww49544 жыл бұрын
Waste of time
@heribertofernandez41604 жыл бұрын
Too much bla bla blaaaaa 🐏 . sorry but bla don't solve problems .
@fixingcarswith15thstautomo364 жыл бұрын
If you watch the video, you will see that I solved the problem and described the process.