CHEVROLET SUBURBAN 5.3L~ P0300, Still not Fixed After replacing the injectors and ignition Coils...
Рет қаралды 256,234
3 жыл бұрынin this video I will share with you how to pinpoint one of the causes of a P0300 DTC on a Chevy Truck...
@phillhuddleston9445 2 жыл бұрын
You know when someone is a master in their trade when they make something complicated look easy, you are great at diagnosing problems which is often the most difficult part in auto repair.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Phill Huddleston Thank you!!
@mustseefootballplayer9593 Жыл бұрын
It's the cats 200000 miles is nothing for these motors.
@sidneymiles8453 Жыл бұрын
People dont want to pay for testing , i had a shop and usely its not the mechanic fault ,best to pay for testing every time usely save you money
@windycity143 6 ай бұрын
Man your good
@richardzulu5733 6 ай бұрын
Brotherman as always I enjoy your videos.
@luisfarfan7767 2 жыл бұрын
You're not just a great Mechanic, you are Actually a Teacher College Level and Great Mentor👍👍👍
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
luis farfan Thank you, I appreciate it!!
@kenbrown7435 Жыл бұрын
⁰
@randyleiferman9411 9 ай бұрын
Thank you for the video.Hope you do more.
@frankvaughn1288 2 ай бұрын
You are amazing not only in your understanding of the diagnostics but the ability to explain it. I really injoyed the vidio.
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@frankvaughn1288 Thank you!
@jimwharton8859 3 жыл бұрын
You are a true diagnostician. I wish there were more mechanics like you that would TEST things before just throwing parts at a problem.
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Jim Wharton Thank you!!!
@jamesbarlowjr.3762 2 жыл бұрын
True That! Not to many “mechanics” anymore. Now a days they are called, “Part Throwers”! Nice Diagnostic Bud! 🤝
@chadvalliere8697 2 жыл бұрын
Pine Hollow Diagnostics South Main Auto Repair Watch Wes Work
@lizardking8388 Жыл бұрын
A couple of notes here: You could have saved a lot of time doing the leak down test. You didn't need to take the valve cover off or put a dipstick in the spark plug hole. All you needed to do is connect your leak down tester and apply 10 psi. You then rotate the crank and when the needle starts to rise, you are on the compression stroke and both valves are closed. Continue turning until the needle stops rising and starts to fall. At this point, you just passed TDC. Turn it back the amount you turned it last and you're at TDC and ready to do the test. When you noticed the leaky cylinder, since you already had the VC off, you should have struck the intake valve with a plastic hammer as sometimes there could be some debris trapped between the valve seat and valve face preventing it from closing. In some cases, it could be some crap stuck in the valve guide. Striking it can sometimes free it up and bring the engine back into service.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Lizard King Thank you for your input, I appreciate it!
@wildwoodtop Жыл бұрын
After all that it turns out it was the intake manifold gasket leak 😋
@ivanpetrenko3393 Жыл бұрын
He was also inspecting the rocker arms if they were sticking. 👍 So in this case yes you need them off.
@darrellteague8629 9 ай бұрын
Some engines don't like being rotated backwards.
@lizardking8388 9 ай бұрын
@@darrellteague8629 You're not going to harm an engine by turning it a few degrees in the opposite direction. In fact this is unavoidable if you're replacing a timing belt.
@ceewood1354 10 ай бұрын
The clear difference between a "general mechanic" versus a TECHNICIAN. Great find, Champ.
@KITS_Auto_and_Truck_Repair 10 ай бұрын
@ceewood1354 Thank you!
@tyroneharris1548 2 ай бұрын
Very good information. Very patient with making your video very thorough. I appreciate you keep it up. There’s a lot of us out here to need people like you.
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@tyroneharris1548 Thank you!
@jabermazigh81 2 жыл бұрын
This is by far the most rewarding explanatory video of the p0300 issue i have ever seen and enjoyed. Thanks man.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Jaber Mazzida My Pleasure!! Thanks!
@juanleyva1723 2 жыл бұрын
@@KITS_Auto_and_Truck_Repair You did a good job on the video. I got the valve leak problem. Thanks for the update
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
@@juanleyva1723 My Pleasure!!
@HotSS20 4 ай бұрын
I don’t usually comment on videos I see on KZfaq but you are great at what you do. You are very thorough and you explain everything so clearly. Just great work. Thank you.
@KITS_Auto_and_Truck_Repair 4 ай бұрын
@HotSS20 Thank you! I appreciate it!
@raymanjohan8838 Жыл бұрын
I have replaced fuel pump, fuel filter, pressure regulator, plugs, wires, about to change injectors..after this vid i feel like this is exactly what's wrong...my engine has 300,000 miles..might as well change the chain too... I'll get another 300 out of it😁..im subbing out of gratitude and the fact that you did an amazing job
@KITS_Auto_and_Truck_Repair Жыл бұрын
Rayman Johan Thank you and welcome to our youtube community! I'm glad to hear that the video was helpful!
@losmoore3358 10 күн бұрын
Wow u are an eye opener. I have the same codes on my 2005 suburban. U are a master in your field. Thank u.
@KITS_Auto_and_Truck_Repair 10 күн бұрын
@losmoore3358 My Pleasure!
@WilliamG-vi2fr 8 ай бұрын
Kit you are absolutely a genius at figuring out tough problems with engines! I took my 2007 Tundra to the dealership for P0420 and P0300 codes last week and they just coded it came up with the same codes and said I needed a new catalytic converter and a complete tune up for $5800! They did not test anything just scan for codes. I wish you were close to me (Georgia)! I have been fighting the P0420 and P0300 code going and coming for a year now and can't get it solved. Thanks for the videos!
@KITS_Auto_and_Truck_Repair 8 ай бұрын
@WilliamG-vi2fr My Pleasure! I'm sorry to hear about your experience at the Dealer!
@JuanGonzalez-xl8tc Жыл бұрын
Thanks for a great video. Thanks for all that helpful information and knowledge you share. Great to know theres honest true technicians out there that can explain what they practice. It feels like been in tech school just by listening to you. 👍🏽thank you so much!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Juan Gonzalez Thank you! I appreciate it!
@bennybronco76 2 ай бұрын
Just wow!! I'm now chasing that mysterious misfire of cylinder 7 on my 2000 chevy Suburban that has 317k miles. It doesn't run rough or anything. But the check engine light is keeping me from passing inspection in Missouri and I need my plates. This has helped a great deal. I was taking notes throughout the video and saved it to show to my mechanic. You are a GOD send my friend. Bless ya!
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@bennybronco76 Thank you, I'm glad to hear that the video was helpful!!
@e.b.6766 3 ай бұрын
Thank for your thorough diagnosis of that vehicle. My supervisor has the same vehicle with the same failure code. Will consider your leak down test before he throws any other parts at it.
@KITS_Auto_and_Truck_Repair 3 ай бұрын
@e.b.6766 My Pleasure!
@JamesBond-kb1wl Жыл бұрын
I have the same issue on my 09 silverado. I've watched 10 videos all saying the same thing with no success replacing sensors etc. But none of them discussed leak down test . I think you hit the nail on the head. I will know in the morning. Very informative
@KITS_Auto_and_Truck_Repair Жыл бұрын
James Bond Thanks! and Good Luck with your project!
@blackpearl8772 3 ай бұрын
Was that the issue?
@johnjohnson2855 2 жыл бұрын
I always love someone that knows WTF their doing and your one of them. Smart and knowledgeable. There’s a lot of guess masters out there.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
John Johnson Thank you!!
@juanmendez7226 Жыл бұрын
I had the exact same issue with my 2000 Suburban 5.3 ls, code p0300, (random miss fire) after replacing many of those parts he mentioned (fuel regulator, spark plugs, wires, coils etc. etc. a friend mechanic recommended replacing the engine after diagnosing that the miss fire came from cylinder 5, low compression, so I took it upon myself 😁 and removed the head on drivers side and voila, the exhaust valve spring on cylinder 5 was broken (cracked) so it would stay open randomly, so I just replaced all of the valve springs, seated all the valves, new head gasket and it's been running perfectly for about 3 years now, I wish he could've had this video back then, his explanation is awesome
@KITS_Auto_and_Truck_Repair Жыл бұрын
Juan Mendez I'm glad to hear that you were able to figure the problem with your engine!
@dinhas9398 Жыл бұрын
This mechanic doesn’t STOP to amaze me! The Best of the best 😮 👨🏾🔧
@KITS_Auto_and_Truck_Repair Жыл бұрын
DinhaS Thank you! I appreciate it!
@Sebastian-dx2xg 6 ай бұрын
Best video so far I’ve seen about explain P0300. Other videos d add how how to check on a scanner and show the miss fire but never explain what the issue is. I think I have this same issue on my truck. I have a P0300 I changed the same plugs and wires. But that’s as far as I want to go. I don’t want to start changing everything.
@KITS_Auto_and_Truck_Repair 6 ай бұрын
@Sebastian-dx2xg Thank you! Do a leakdown test and see what happens!!
@robertorodriguez6772 Жыл бұрын
Thank you for taking the time to patiently explain your process of diagnosing this issue. I definitely learned something new from watching you.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Roberto Rodriguez My Pleasure!!
@robertorodriguez6772 Жыл бұрын
@@KITS_Auto_and_Truck_Repair What are considered normal fuel trim levels ?
@KITS_Auto_and_Truck_Repair Жыл бұрын
@@robertorodriguez6772 + or - 10% total trim is considered normal!
@robertorodriguez6772 Жыл бұрын
@@KITS_Auto_and_Truck_Repair Great, thank you.
@KITS_Auto_and_Truck_Repair Жыл бұрын
@@robertorodriguez6772 My Pleasure!!
@patrickhays4990 Жыл бұрын
I'm having the same problems with the same year and same motor. You explained it better than anyone including my local garages.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Patrick Hays Thank you!
@gpatriotpatrick6146 Жыл бұрын
This is how to diagnosis the problem! THIS IS GOLD! GREAT JOB MAN!! Much respect for you!
@KITS_Auto_and_Truck_Repair Жыл бұрын
G Patriot Patrick Thank you!!
@KTBRacing 2 жыл бұрын
Thank you for giving us so many options to diagnose this code!!! I just had one pop up driving on my way home and I’m currently going through the diagnostic stage and trying not to throw money at it unti I have a definite answer and these bids help a lot!!!
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
PitBikeWreck My Pleasure!!! I'm glad this video is helpful
@louispierre154 Жыл бұрын
you are a awesome teacher as well as a good mechanic you made this look easy I truly learned something Thanks !!!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Louis Pierre My Pleasure! Thank you!
@kennethalbert4653 Жыл бұрын
There's a problem when your mechanic needs a mechanic ! Great job doing it right and getting it done !!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Kenneth Albert Thank you!!
@danieltrevino80 Ай бұрын
Best explanation thanks. I have the same problem and did the same thing bought everything new. I have my misfires on 4. I will check the valves on 4. Super thanks very help full
@KITS_Auto_and_Truck_Repair Ай бұрын
@danieltrevino80 My Pleasure!
@buntnik 2 жыл бұрын
EXCELLENT! thorough diagnosis, crisp clear explanations. With single misfire showing on scanner, the first shop should have told the customer exactly that - a single cylinder misfire. A general tune-up (an 8 cylinder solution) is not correct solution for a one cylinder symptom.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Fred In Venice Thank you!!
@annettegonzales168 Жыл бұрын
I’m having this exact problem! We’re doing the cylinder leak down test on Sunday. I’m so scared… thank you for this video! 😊
@KITS_Auto_and_Truck_Repair Жыл бұрын
Annette Gonzales My Pleasure! and Good Luck with your vehicle!
@annettegonzales168 10 ай бұрын
It actually turned out to be the timing chain and the thing the chain goes around. Was looking at 2500 fix at first but we paid 800 for the chain and the other thing lol idk what it’s called. But yeah.. 😊
@JuanRodriguez-cm1rx 2 жыл бұрын
I love that you explained it very clearly step-by-step I am so happy please keep up the excellent excellent work
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Juan Rodriguez Thank you!!
@donowen33 2 жыл бұрын
I'm blown away with your professionalism, knowledge, honesty, and demeanor in this video! Bravo!
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Don Owen Thank you!! I appreciate it!!
@joemarquez1515 6 ай бұрын
GREAT FREAKING VIDEO AND INFORMATION!!! I BEEN STUCK WITH MY LQ4! I DID A DIY CYLINDER HEADS AND CAMSHAFT SWAP BECAUSE THEY NEEDED TO BE REPLACED AND WHILE DOING THAT I ALSO CHANGED OTHER PARTS JUST BECAUSE WHY NOT! SO I PUT THE ENGINE BACK I BELIEVED DAMN NEAR PERFECT WITH THE HELP OF A HOW TO REBUILD LS SERIES ENGINE BOOK OFCOURSE A LITTLE BIT OF KZfaq AND EVERYTHING WAS ON TO THE T WITH THE TORQUE SPECS AND EVERYTHING! THE ENGINE LOOKS BEAUTIFUL AND WELL PUT BUT FOR SOME STRANGE REASON IT STILL MISFIRED!?!?! I WAS HEARTBROKEN! BUT NOW WITH THE HELP OF THIS MANS KNOWLEDGE AND VERY GOOD AND DETAILED EXPLANATION ( BECAUSE FOR SOME STRANGE REASON SOME PEOPLE ON THIS KZfaq CANT EXPLAIN THE EASIEST EXPLANATION!) IM ALMOST POSITIVE IM GOING TO FIND THE PROBLEM WITH MY BEAUTIFUL TRUCK NOW! THANK YOU SIR FOR YOUR KNOWLEDGE AND TIME U TOOK TO MAKE THIS VIDEO FOR SOME STRANGE REASON WHEN I SAW IT I KNEW THIS VIDEO WAS IT! AND I WATCHED AND LISTENED TO EVERY SECOND OF IT AND USUALLY I DONT HAVE THE PATIENCE BUT LIKE I SAID I JUST KNEW THIS VIDEO WAS IT AND SURE ENOUGH! THANKS AGAIN SIR!
@KITS_Auto_and_Truck_Repair 6 ай бұрын
@joemarquez1515 My Pleasure! I'm glad to hear that the video was helpful, Good luck with your truck
@hell_pike9150 3 жыл бұрын
I think its not my problem but I still enjoyed the video and watched to the end. You are like a doctor with cars! Good job and please keep up the good work! You are making the whole world a better place to upload these videos.
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Hell_Pike Thank you!!!
@BobbyFigliola 10 ай бұрын
Great through job on testing.... wish mechanics looked at all repairs this way.. you are a diamond brother
@KITS_Auto_and_Truck_Repair 10 ай бұрын
@dinocards57 Thank you!
@jorgemora7190 2 жыл бұрын
Hi mr k this is the first time l see some body show all this cyn miss fire and expand the all inf about leaking valves thakns mr k you are a master on mecanic god bless you you and you all family
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Jorge Mora Thank you!!
@hcxchange 2 жыл бұрын
I really enjoyed watching your expertise in accurately diagnosing this issue. I came across this video after already subscribing to your channel a few weeks ago. I'm having a similar issue with the p0300 code but my engine is running fine. I wish you were closer or that I could take it somewhere to get properly diagnosed.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
hcxchange Thanks for subscribing and welcome to our youtube community, you should take your car to a pro mechanic who can diagnose it properly!! Good Luck!!
@chapinburgess3220 2 жыл бұрын
Thanks for the thorough explanation of each part. My 2004 6.0L is doing the exact same. I finally got it to give me a code showing that it too was cylinder #6 on my truck. I did not replace all the parts only plugs and wires. I tested and cleaned all the other parts you mentioned including the MAP and MAF. Today I found a vacuum leak and that changed the rough idle to run a little better. Tomorrow I will try the pressure test and cylinder leak down test. Thank you for direction on my new route of testing. Here is hoping it is only the head and not the piston rings.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Chapin Burgess My Plaesure!! Good Luck with your project!!
@jabermazigh81 2 жыл бұрын
What happened next?? Did you fix the misfire? I am also having the exact same thing.
@elgarfio4186 Жыл бұрын
You're the Buda of mechanics, literally thanks so much for your information and knowledge, and must to of all, sharing with us!🙏🙏 God bless you!
@KITS_Auto_and_Truck_Repair Жыл бұрын
El Garfio My Pleasure! Thanks!
@rodelgarcia1847 Жыл бұрын
Very thorough diagnosis explanation.Learned a lot from this.Thank you!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Rodel Garcia My Pleasure!! I'm glad to hear that the video was helpful!
@daveseck5182 2 жыл бұрын
Your teaching is very useful , i have replaced all of things you said on 2005 avalanche. What is so helpful is you are speaking on a level of skill that doesn’t start with “This is a wrench”, it is used……..bla bla
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
dave seck hahaha Thank you!!
@jodenc 2 жыл бұрын
Great video! I enjoyed watching this. My expertise is in 5SFE and 3SGTE Toyota engines, but I have had a LM7 5.3L engine since 2017 that I have been avoiding tearing down and replacing the heads on. Recently I got a P0300 code and I know that I am having valve seat issues. I have the stock Castech 706 heads which were notorious for developing a crack in the casting. I also am burning coolant. Time for me to man up, crack my knuckles, and tear this baby down. Thank you for such good information, and for giving me the inspiration to start pulling the heads.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Jody C My Pleasure!! Good Luck with your project and reach out if you have any questions!!
@jodenc 2 жыл бұрын
@@KITS_Auto_and_Truck_Repair Thank you! Will do.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
@@jodenc My Pleasure!!
@stevenallen6245 Жыл бұрын
Good thing there're easy to work on
@abisismael1343 3 жыл бұрын
Clean job ! Thank you for your professional way !
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Abis Ismael My Pleasure! Thank you!!
@train4905 2 жыл бұрын
Dear sir,i have just found this video.i would like to compliment you,on the presentstion,it was do clear,precise,articulate,methodicsl.and analytiical.an absolutely brilliant video sir.this is exactly whats happening to my car.av just subbed,steve from the uk.keep up the great vids.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Stephen Allen Thank you!! and welcome to our youtube community!!
@rolandgutierrez813 5 ай бұрын
you are 1 awesome mechanic and very good teacher at that ! i am surprised that the compression test did not show a very low compression for cylinder 6 ! wow
@KITS_Auto_and_Truck_Repair 5 ай бұрын
@rolandgutierrez813 Thank you!
@sulemanhabib1743 3 жыл бұрын
Very good and nice job,we proud of u , good intro, KD u make me great technician, Habib Auto from Ghana Accra West Africa
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Suleman Habib I'm glad to hear that! Thank you my man!
@stratsman7556 3 жыл бұрын
Great Video...Very good diagnostics and well done! I just threw a p307 on my silverado now have to find problem. Hopefully not a valve..
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Paul Zeipelt thank you!!!
@eileenenos7350 Жыл бұрын
I chose thumbs up because you went step by step. Pin pointed the problem, well explained and very understandable!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Eileen Enos Thank you!
@BeADad2447 2 жыл бұрын
Bro! This is ridiculous! Nobody is going to comment on how cool this brother is? I want to know where you are from? Thank you my brother! I wish you lived near me. God bless you!
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
A Tre Thank you!! I'm From the Republic of Congo!!
@something2do528 2 жыл бұрын
Right on! this is a perfect content video. With no fluff. thank you
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
something2do My Pleasure!! Thanks
@paulsullivan1901 Жыл бұрын
Awesome video!!! I have been chasing this same code in my 2004 sierra 2500HD. I did do the plugs, plug wires and coils which made a huge improvement but every now and then I still get the code. Definitely going to do more research before just replacing the injectors. Thank you so much for an excellent video!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Paul Sullivan My Pleasure!
@budman201 Жыл бұрын
What did you find out? I have same truck same code
@paulsullivan1901 Жыл бұрын
@@budman201 unfortunately I got hit in the rear axle shortly after posting so I haven't done anything based in what I've learned from this video. If I figure anything out once I start working on it I will let you know.
@danmoore5509 10 ай бұрын
This is the best diagnostic I have seen with this issue. I can't stand it when "mechanics" want to just throw parts at a problem.
@KITS_Auto_and_Truck_Repair 10 ай бұрын
@danmoore5509 Thank you!
@Maxhorizon2 2 жыл бұрын
You are a lifesaver! Thank you. I almost bought like 500 bucks worth of parts & do it myself 😅😅 I will have it checked. Thanks a million!! Blessings 😎😎
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Eduardo Duran My Pleasure! Thanks
@abrahamharris2464 2 жыл бұрын
Great job very informative and thorough
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Abraham Harris Thank you!!!
@chrisjones8683 3 жыл бұрын
A true master technician at work 👌likesd subscribed
@KITS_Auto_and_Truck_Repair 3 жыл бұрын
Chris Jones Thank you!!!
@13ernest13 Жыл бұрын
i have had the same problem for two years , i am so glad i watch your awsome video! i now know i will be doing a valve lash on my heads. btw my # 6 has the same high count of missfires. cheers
@KITS_Auto_and_Truck_Repair Жыл бұрын
Ernest Mazurek III I'm glad to hear that the video was helpful!
@justindodson7471 2 жыл бұрын
Excellent information! Helps me a lot! Ive probably misadjusted my rocker arms which is giving me the p0300 and rough idle after replacing my lifters. Dipstick was a great tip as well.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Justin Dodson Thank you!!
@chondelgado5325 Жыл бұрын
Amazing video, I have this code in my truck. I was about to start chasing down the problem myself. But I think I’m going to take it to my ASE certified mechanic and let him diagnose it the right way 😅
@KITS_Auto_and_Truck_Repair Жыл бұрын
Chon Delgado Thanks! That's a smart move!!
@GrievenceCapitolist Жыл бұрын
Thank you for simplifying the leak down test . Nice job making things clear and precise .
@KITS_Auto_and_Truck_Repair Жыл бұрын
CMC I live My Pleasure! Thanks
@chevybob9836 2 жыл бұрын
Great video. And great explanation of a problem I'm also having with my 2004 Silverado. Thank you for sharing.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
chevybob My Pleasure!!
@ivanesquivel8456 5 ай бұрын
First time i see this technique very quick way to check a leak your a smart man
@KITS_Auto_and_Truck_Repair 5 ай бұрын
@ivanesquivel8456 THANK YOU!!
@joper817 2 жыл бұрын
Great video great work i am having same issues with my 07 Tahoe i am definitely going to try this. You should make an update video.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Jose Peralta Thank you!!
@jasonpecor 2 жыл бұрын
Hi Jose - did you ever figure out what was going on with your '07? I have the same issue with my 2007 Tahoe on cylinder 4.
@richardhudson7206 Жыл бұрын
Excellent diagnostic video. The other shop obviously did not have the proper equipment and skills to locate the problem and used the "shotgun" diagnostic procedure. The customer needs to find out if the other shop would prefer to issue a refund or spend some time in small claims court. With over 200,000 miles, the rod, main, and camshaft bearings as well as the timing chain, oil pump and all other internal parts have the same mileage. I would probably recommend a low mileage used engine or a rebuilt one if the rest of the vehicle is in good condition.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Richard Hudson Thank you!! Yes I recommended engine replacement!
@davidfrank6432 2 жыл бұрын
WOW!! Outstanding video with sound mechanical reasoning and diagnostic's. Son has 08' Avalanche with very similar problem and shop in Texas is throwing parts at it. Told him to stop! Get it home and I'll come look at it. This video helps immensely in my thought processes and diagnostic plans. Well done my friend! Wished we had more True Automotive "Technicians" like you !!
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
David Frank Thank you!! Good luck with your son's truck!!
@mtsanchez27 2 жыл бұрын
What was the fix?
@davidfrank6432 2 жыл бұрын
@@mtsanchez27 Marcos...I could never definitively the culprit. His 2008 Chevy Avalanche still has some misfires on #5 and to lesser degree some on #7. I followed K Diagnostics logical approach. I scanned vehicle using my Bluedriver OBDII and checked Mode 6 data and many other parameters. I saw nothing that stood out. Next visual inspection of wires, connections, grounds. I replaced all plugs and wires with AC Delco along with air filter. Did spark check with spark tester set at 35Kv gap. Healthy spark. Did NOID light check of injectors and all were showing indications of electrical continuity. I checked MAF sensor, then removed and cleaned throttle body. I checked Fuel pressure at rail with Bluedriver backup. I did power balance. I ran vacuum check warmed up and truck pulls steady 19" Hg. Still nothing definite. I pulled valve covers and checked integrity of valve train, especially cylinders 1, 2, 4, and 7 since those are AFM cylinders. I did warm/dry compression check and all were around 185 psi! I did cylinder leak down test and all 8 cylinders had minimal leak and near identical numbers (Regulated 30 psi with leakage gage at 28 psi). Car idles great and for 156, 000 miles pulls strong. So I came back to OKC from Houston and told son drive it and keep me advised. A local Chevy dealer looked at it after all my work and told him he needed new engine due to suspect sticky valves!!! I asked the Service Manager to tell me with all the date I have (which I gave them), why they think it needs a new engine?! Nothing but crickets! Anyway, one item left untested was the actual injectors as to spray pattern etc. They appear original so I can only surmise that "maybe" that #5 fuel injector is erratic or dirty and maybe not spraying a nice atomized pattern? Good luck with your endeavors.
@davidfrank6432 2 жыл бұрын
Marcos, I forgot! Early on when I did visual and got ready to check vacuum I pulled the PCV hose from drivers side valve cover...at the rear area. It has like a factory 45 degree angle hose fitting there about 2.5" long? It had a near 1" crack in it! I replaced the entire hose from that valve cover to the intake with new GM part number then did vacuum check. I suspect part of the issue was A/F ratio issue with intermittent leak from that hose. For grins I checked entire intake area and other common spots to see if there were any other vacuum leaks downstream of the MAF sensor and did not find any others.
@mtsanchez27 2 жыл бұрын
@@davidfrank6432 thank you so much for your help!!!
@dhx4133 Жыл бұрын
this guy is Grade A. Very knowledgeable, he knows wats up
@KITS_Auto_and_Truck_Repair Жыл бұрын
D Ace Thank you!
@kaylamarie8309 2 жыл бұрын
Great video, very helpful. My 2005 Chevy Silverado 1500 5.3 threw a code PO303 on me at work a couple of nights back. The engine was running a little rough lately ( while in gear, idling with foot on the brake) so I pulled the ignition coil (I also smelled burning electrical components from under ) and it tested bad so I replaced it and the plug. I also changed the drivers side valve cover because I knew the fixed pcv orifice was likely plugged up. It was terrible. Cleared the codes with a scan tool and took a drive. Now the PO303 is gone but code PO300 Pending is now showing up. Engine light on, blinking etc. I'm a contractor and I own the truck..high mileage, 300,000 miles plus. Fix one problem, expose another one I guess. I didn't fire the parts cannon at it..just the number 3 ignition coil and spark plug which actually didn't look too bad. Anyway, hope I can figure this thing out. Oh, engine has low oil pressure as well which I confirmed with a manual tester, not just relied on oil pressure switch. Great channel Sir, new sub.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Kayla Marie Thanks for subscribing to the channel, did you check for vacuum leaks and fuel pressure?
@kaylamarie8309 2 жыл бұрын
@@KITS_Auto_and_Truck_Repair My pleasure Sir, your channel is awesome! I have not as of yet..I have to go pick up another fuel/vacuum tester gauge from HF..probably pick up a noid set as well. I did not notice any noticeable vacuum loss but when I changed out the bank 1 side valve cover due to the fixed pcv orifice being clogged up, I disconnected brake booster for the install and then plugged it back in. Engine might be freaking out because it can breathe again. I wondered if that caused an issue. I ran another diagnostic today with my Autel Maxicheck scan tool which showed long term fuel trim bank 1 steady at 5.5 percent while the other trims fluctuated so I suspected a bad o2 sensor..not sure whether it would be sensor 1 or 2. My scanner does not support looking at all o2 sensors in real time data. I also think that cylinder 3 has a bad wire. I listened to all the plug wires through a mechanic stethoscope and #3 ticks like a spark tester lol. I know that's less than a pro approach but this PO300 pending code is perplexing . I'm not a certified real mechanic and my scan tool is limited.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
@@kaylamarie8309 if you don't have some of these tests tools, you should have it diagnosed at a pro mechanic shop, so you can really find out the problem!!!
@kaylamarie8309 2 жыл бұрын
@@KITS_Auto_and_Truck_Repair Thank you once again for the kind reply Sir! Turns out I already had the fuel/vacuum gauge after all so I just went and picked up a noid kit at our local HF..never know when you might need that. I'm really trying to hard to learn all this stuff and you have to have equipment to really do that. After I changed cylinder 3 ignition coil I also bought a new plug for it just out of caution even though the plug that was in it seemed to indicate that it was operating properly and under the right heat condition. I kept the old plug. Coil for three tested bad so I knew it was an issue. Even with the new coil and spark plug, I tested them through the old spark plug wire and the spark in the tester seemed weak (dim and not firing well) to me so I put on a new set of wires before getting too involved with other directions. The spark in the tester was much brighter and more active and the engine ran great. I ran it a while under load and it still ran really good. I cleared the code with the scan tool which actually has more options upon closer inspection and I have been driving the truck for a couple of days with no problems and no further codes popping up. When I initially checked for the pending code po300 prior to clearing the codes , the scanner did not find it so I am assuming the problem is fixed. If it returns I will take it to a pro shop for a more in depth examination. Does that sound reasonable or should I take to to a mechanic anyway?
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
@@kaylamarie8309 That sounds Reasonable keep driving it and see if the check engine light will come back on!!
@Dion764 Жыл бұрын
Your car contains what seems like an endless array of sensors, one of which is the knock sensor. Although the knock sensor doesn’t get as much publicity as some of its counterparts, it does play a crucial role in keeping your car’s engine running right.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Dion Alexander Thanks for your comment!
@sabrinakoehler1105 4 ай бұрын
Spot on..
@tes7513 Жыл бұрын
i like the way you follow to narrow down and find the real cause
@KITS_Auto_and_Truck_Repair Жыл бұрын
Thomas Gofar Thank you!
@GRJCLyon 11 ай бұрын
I’m going through this with a 2017 Silverado except it’s cyl 3. I tried the leak down test but was inconclusive because when I put air in the cylinder the engine spun just enough to open the valves again. I know this because I marked the serp belt and alternator as a starting point. It’s crazy that these motors all have the misfire but I see so many things causing the same issue. Very good video. It’s been a little while since I’ve done this so I wanted to make sure I did it correctly. Thank you for this.
@KITS_Auto_and_Truck_Repair 11 ай бұрын
@GRJCLyon My Pleasure!
@markstorjo3432 2 жыл бұрын
Great job, very well explained without a lot of wasted time on common preparation of test procedure. Your buddy is not going to like you making him look bad by throwing parts at this issue.Haha
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Mark Storjo Thank you!! LOL!
@elbeemer 2 жыл бұрын
Excellent videos. You are an excellent mechanic. You should be teaching at a college, sharing your knowledge.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Jorge Arballo Thank you!!
@agoodneighborautorepair2176 2 ай бұрын
Very good information and explanation.
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@agoodneighborautorepair2176 Thank you!
@stevewaddell2859 2 жыл бұрын
I’m in this exact current situation. Thanks for your help & expertise.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Steve Waddell My Pleasure!!
@billsmith2212 Жыл бұрын
Just a suggestion . Would a relative compression test also point you to cylinder #6 . Then put an articulating bore scope with 2 cameras to look at the valves . If you see a piece missing , it could save removing the valve cover . The leak down test is positive proof . What I am thinking is that the other tests could possibly save you time if the result is obvious . Great diagnosis .
@KITS_Auto_and_Truck_Repair Жыл бұрын
Bill Smith Thanks for your suggestion but for some reason this engine passed the relative compression test!
@billsmith2212 Жыл бұрын
My point is if you suspect a problem and get a borescope in #6 and see a valve burnt , it may save you time . At that point , the customer has to make a decision . Lucky you could get the valve cover off and #6 plug out . And the leak down test is proof . Good Luck 👍 .
@Dvdinhulkmania Жыл бұрын
Let me bring Ppl up to date on a common problem with with GM / GMC with 4.8, 5.3, or 6.0 between 02 -06 if you only notice the P0300 code after reaching 65mph or more and especially after changing all of these parts out it is likely that the Crankshaft needs to be relearned. It’s definitely worth a try before changing out or rebuilding the motor. On the video the motor didn’t sound too bad to me while running. I got a 05 Yukon Denali with the 6.0 and it’s having the same P0300 code after changing out spark plugs, wires, mass air flow sensor, and all 8 ignition coils! No problem with fuel pressure or fuel injectors or Oxygen sensors! Im taking my truck to the shop on Tuesday for Crankshaft Relearn if anyone wants to know the outcome just ask l will reply
@KITS_Auto_and_Truck_Repair Жыл бұрын
David Haynes Thanks for sharing that! the crank relearned was done before the truck was brought to me! it didn't fix the problem! Good luck with your truck!
@ramoncezar1919 Жыл бұрын
What happen after crankshaft relearn?
@Dvdinhulkmania Жыл бұрын
@@ramoncezar1919 l had the crankshaft relearn done and now No More P0300 codes. Check engine soon light has been off every since😎
@jb333zy3 11 ай бұрын
Did it cause a no start or a very very long crank
@modus_operandi2508 2 ай бұрын
Crank shaft sensor does not have to be reset , look it up.
@cornwasher Жыл бұрын
Absolutely first class job of tracking down the problem.....
@KITS_Auto_and_Truck_Repair Жыл бұрын
MM Reporter Thank you!
@user-hi3pt3mv2i 15 күн бұрын
u stated u used a compression gauge was it the old analog gauge. i got on board 5 yrs ago with in cylinder pressure transducer that changed everything for me , dont even use the old gauge anymore. you would have seen your problem with that, if u dont have one get one and learn to use it. its amazing.
@KITS_Auto_and_Truck_Repair 14 күн бұрын
@user-hi3pt3mv2i Yes! I agree, I use an in cylinder pressure transducer now, this video is been a here for a little while before I got the transducer!
@Z14kt12timandjes1 Жыл бұрын
Very nice video. Thanks. I've been helping my son with his 5.3 L engine. I did a relative compression test and a couple of the cylinders show a bit low on the trace compared to the rest. The truck runs good, and is not showing any misfires in scan data. I don't have a leak down tester, but I'm considering getting one. Question, if a leak down test showed a non-sealing valve, would it be an acceptable repair to just pull the head off and replace the valve and the spring components? Would I necessarily have to send the head to a machine shop to be resurfaced if there was no evidence of warpage with a straight edge? I also saw on eBay some used cylinder heads for this engine for around $200 for the complete heads. I'm wondering if that would be an acceptable route to take? My son doesn't have a lot of money to sink into this truck, so just trying to find the least expensive fix possible.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Timothy Horne Thanks! is the head on eBay new or used? it's always good to send the head to the machine shop to get it checked and cleaned if you plan on reusing it!
@Z14kt12timandjes1 Жыл бұрын
@@KITS_Auto_and_Truck_Repair it's a used head. Thanks!
@KITS_Auto_and_Truck_Repair Жыл бұрын
@@Z14kt12timandjes1 My Pleasure! I think you'll be better off sending the one you have to the machine shop than getting a used one online!
@mrbranson73 2 жыл бұрын
The original mechanic is a "parts replacer". They're very expensive
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Corn Pop won hahaha yeah!!
@sambitar8448 Жыл бұрын
METICULOUS, VERY CAREFUL AND PRECISE DIAGNOSTICS, RIGHT ON THE MONEY WITH CLEAR EVIDENCE.THANKS AS ALWAYS.
@KITS_Auto_and_Truck_Repair Жыл бұрын
sam bitar My Pleasure! Thanks
@bill2873 2 жыл бұрын
Your mechanical skills are excellent. Some details are repeated too often. Thanks for a helpful video.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Bill Thank you!!
@bennybrown7086 Жыл бұрын
I'm just going to buy an electric car I'm sick of this 😂🤣🤣
@KITS_Auto_and_Truck_Repair Жыл бұрын
BENNY BROWN Lol!!
@user-vs1vd7us8g 2 ай бұрын
My truck only knocks when cold. With p0300 code
@bryanrackley2058 Жыл бұрын
Excellent video. I am fighting this exact same issue now. I pulled my engine after 225k miles due to one of the cylinder’s lifter making a crazy amount of noise. My 2011 features the DOD/AFM feature but not anymore after my rebuild. I didn’t do any piston or head work just cleaning and valve lapping. I will proceed next with your cylinder leak down test. I could use you here in South Carolina, lol. Thank You!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Bryan Rackley My Pleasure!! I'm glad to hear that the video was helpful!! Good Luck with your Project!
@JohnMPavin 9 ай бұрын
Fantastic explanation for a professional or beginner. Excellent tutorial sir.
@KITS_Auto_and_Truck_Repair 9 ай бұрын
@JohnMPavin Thank you!
@kaylamarie8309 Жыл бұрын
Stumbled across your video again, Watched it again and concluded that you are stilll a genius lol.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Kayla Marie haha Thank you! I appreciate you!
@kaylamarie8309 Жыл бұрын
@@KITS_Auto_and_Truck_Repair You're welcome Sir and I appreciate you right back! You have a great channel.🙂
@KITS_Auto_and_Truck_Repair Жыл бұрын
@@kaylamarie8309 Thank you!!
@cuivincent9744 2 ай бұрын
Great Job!!!.. The grim logic is awesome. If the spark plug can lit spark but still misfire, than 80% is from valve head .
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@cuivincent9744 Thank you!
@ryans9103 6 ай бұрын
Mine was the ground wire on the lower left side of the block. Thanks for showing everyone this helpful video
@KITS_Auto_and_Truck_Repair 6 ай бұрын
@ryans9103 My Pleasure!
@92camaro100 14 күн бұрын
Was the ground wire rubbing up against something
@ryans9103 14 күн бұрын
@92camaro100 No, it just broke off from corrosion on mine. But corrosion will make a bad connection too.
@92camaro100 14 күн бұрын
Ok thanks for letting me know about the ground wire being corroded.
@michaelwcisel2553 8 ай бұрын
I like to thank you for taking your time to go over everything , you did a awesome job thank you
@KITS_Auto_and_Truck_Repair 8 ай бұрын
@michaelwcisel2553 My Pleasure! Thanks
@esetoker2711 2 жыл бұрын
one of the best and most informative videos to date rock on bro
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
ese toker Thank you!!
@esetoker2711 2 жыл бұрын
Definitely subscribed brother looking forward to more videos bro
@HUNT3R737 Жыл бұрын
This was a great video. I really like your step by step troubleshooting
@KITS_Auto_and_Truck_Repair Жыл бұрын
HUNT3R Thank you!
@zackbullock8198 Жыл бұрын
Thank you! You are knowledgeable and incredibly articulate.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Zack Bullock Thank you!
@gabealexander519 2 жыл бұрын
Very Cool, You Explained it Very Very Well. I have a PO308 and have checked and exchanged ignition coils , test Wires, Plugs, Compression at min, but did not do a Leak down test. This Video Should Help me determine what problem is. I have tho 487k miles on motor and Did a Valve and grind years ago at under 200k miles. I know I should get a motor at junk yard with hopefully low miles of 80 to 100k. Thank You, You Explained well that I can try following your Class Advice Tutorial. I'm not a Mechanic but I have years of Machinist Exp... Thanks, Gracias.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Gabe Alexander Thank you and Good Luck with your project!!
@CarlosSanchez-cj5wo 2 жыл бұрын
Great video. Master technician makes it look easy. Great troubleshooting.
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
Carlos Sanchez Thank you!!
@josephbyrd7769 Жыл бұрын
This guy's video is great 👍. You got a new subscriber, excellent diagnosing
@KITS_Auto_and_Truck_Repair Жыл бұрын
Joseph Byrd Thank you and welcome to our youtube community!
@Benhall1 Жыл бұрын
Man this was an informative video. I am in the exact same position as this truck owner. Mechanic just threw new parts (exact same) for this mystery P0300 code. They just gave up but I ended up with the bill for all the parts which they claimed the L99 engine needed but didn’t. I am praying its not an exhaust or intake valve. But i had new o2 sensors b1s1, 8 spark plugs, 8 spark wires, 2 coils, 3 injectors, but P0300 remains 😤 I wish you were near NYC!
@KITS_Auto_and_Truck_Repair Жыл бұрын
Ben Hall Oh I'm sorry to hear about what you went through! I hope you can find a Technician who can fix it right!
@texan4jesus789 Ай бұрын
Great in depth tutorial. Hope my Burb doesn't need that.
@KITS_Auto_and_Truck_Repair Ай бұрын
@texan4jesus789 Thanks!
@greggb1416 2 ай бұрын
Oh man…, excellent video..! Yep, a bit late to viewing this video. Now subscribed. Thank you sir.
@KITS_Auto_and_Truck_Repair 2 ай бұрын
@greggb1416 My Pleasure! welcome to our youtube community!
@Matt014X Жыл бұрын
thanks for the video I learned something. Video's like this are what contribute to making youtube such a powerful tool.
@KITS_Auto_and_Truck_Repair Жыл бұрын
Matt Sweeney My Pleasure!
@doromorales4711 Жыл бұрын
Great explanation on troubleshooting, you are great at explaining, hats off to you. 30:58
@KITS_Auto_and_Truck_Repair Жыл бұрын
Doro Morales Thank you! I appreciate it!
@bobbyboy1962 2 жыл бұрын
ABSOLUTELY the best video for this problem and now i check on mine thankyou
@KITS_Auto_and_Truck_Repair 2 жыл бұрын
BobbyBoy1962 My Pleasure!!
@kennethdickinson1023 10 ай бұрын
I’m going through this right now. Heading to Harbor Freight right now to get one. Cyl 5 and 6 constantly misfiring. Replaced damn near everything because we are planning on keeping the truck and just rebuilt the engine but still couldn’t get past this. I suspect this is my problem but heading out to get the tester. Thank you so much. You are a great teacher.
@KITS_Auto_and_Truck_Repair 10 ай бұрын
@kennethdickinson1023 My Pleasure and Good Luck with your project!
@kingcobra6049 3 ай бұрын
Found the problem?
@kennethdickinson1023 2 ай бұрын
Yeah. It turned out to be several problem. Rocker arm was loose on cyl 6. I also used an aftermarket crankshaft sensor that would fail when it got hot. Put the original ac delco back in and the problem went away without having to do the crankshaft relearn process.
@kingcobra6049 2 ай бұрын
@@kennethdickinson1023thanks, I’ll see what I can find on my.
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