Chevrolet Silverado 5.3 : Misfire

In an effort to salvage a video I came out with this one. I have been messing with a screen recorder on my Autel 908 and it really messed up on the first vid to the point it just wasn't usable. Needless to say I drag you along for "Part 2" and try to salvage what I can. Oh well, some days you get the bear and some day the bear gets you. -Enjoy!

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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

[SouthMainAuto]

*Be sure to check out PJ over at Voltage Drop Diagnostics as he demonstrates how to check injector flow to diagnose a lean problem on a Toyota. This is a method I learned from him and has been very helpful and can be added to your diagnostic arsenal as well! Tell him Eric O. sent ya* 😉

[bobbiebigg]

Eric Every time ya work on a Chevy Truck I say "I didn't Build it, but I'm gonna fix it, because I bought it" I still love my Chevys.

[kimpettit]

I am glad I am retired from busting knuckles as an Master Tech at Toyota for 36 years, we did not have all the fancy tools to diagnose as they are today. I love seeing the new tech world of tools to make jobs more easy and making sure things are fixed.Keep up the great work, with the videos As the old saying once a grease monkey always a grease monkey.

[deathk]

I recently had a sudden dead cylinder misfire issue with my '06 G6 V6. Got a P0303 (cylinder 3 misfire) along with the flashing CEL and lean codes. Went through troubleshooting steps: swapped plugs and wires between cylinders, checked spark with inline tester, checked compression on that cylinder (was 190-200PSI). Was looking like a fuel delivery issue. Tested the injector coil resistance and it was good. Checked as much wiring as I could and nothing seemed amiss. Checked the signal from the ECM to the injector and it looked good. All evidence was pointing to a clogged or stuck closed injector.

I replaced the faulty injector (new bottom o-rings for all the others too) along with plugs and wires for good measure. Was a bit of a job due to having to remove the top intake plenum and everything in the way. Got it all buttoned back up and that fixed it :)

[crashcourse]

A persons troubleshooting ability is the difference between a parts changer and a true mechanic. Thank you for continuing to make in depth videos.

[luispatino]

After a week of scratching my brain out trying to figure out a rich running engine (that i still cant figure out)... A night off watching some SMA is all i needed!

[eileenheitman]

Hi Eric, After the injector swap and you fired the engine and reviewed the scanner info, you mentioned the slightly negative fuel trim averages and theorized that vapor pulled into the pvc system from fuel contaminated oil was likely he reason. Brilliant. Information like that is another reason as to why I follow your channel. Thanks for taking the time and effort to share your vast depth of knowledge. I began my learning 60 years ago in the pages of my beloved HotRod magazine. I still read it (Street Rodder et. al. have just been cancelled as a print media, sadly) and for some years now YouTube has been a huge contributor to my continued attempt to learn. You’re the best, Eric. Thanks, and best wishes to you and your family. Semper Fidelis Dave Heitman in Omaha

[nickstarks]

THANK YOU VERY MUCH ERIC!!! For going through the effort of doing this video twice. I genuinely appreciate it. Keep up the great work!

[OhioLiving]

Eric you are the absolute best technician I have ever seen. Colorful, honest and smart .. A real class act!

Keep up the great videos even if YouTubers are constantly calling you asking for help lol..

[sgrichardson]

Mistakes happen to everyone using video recording, still salvaged enough to make sense and for us to learn from. Appreciate everything you do, thank you!

[pickles-tofq]

More towns need more shops ran like guys like you.

[tombeilman]

Watching you makes me want to go clean my engines, my vehicles have never been this dirty

[spelunkerd]

Gotta like the way the scope recorded the results, at about 6:21, and it was helpful to see how you had the pressure sensor attached later. Of course the slight variance in the pause between each test doesn't make any difference, since the duration of each 'on' time was identical. Cool to see the test automatically boosted rail pressure to exact baseline before each cylinder test. Excellent point about how excessive fuel in one cylinder causes lean misfires on the rest of the bank. It is so nice to see another SMA video!

[mikebaca]

Eric O, My greasy old hat is off to YOU Fine Sir .. Im 64 and been fiddling with mechanics for a very long time. You fine sir are teaching this old dog new things with every vid you do. I especially love your explaing the diagnosing that brings you to the fix... Proof positive that an old mechanic can learn new things. You are right if You can do it, I can too, I just LOVE that. Best teacher I ever had, and replacing my DAD is a feat I thought no-one would ever do. So sorry for your loss. Keep the vids coming Ive got a lot to LEARN.... MB in Ut.

[anthonyl]

Hey SMA, I'm glad you didn't let the setback of the video error stop you. Fixing a vehicle problem can be maddening by itself. Not many can fix, video, edit, and entertain. Keep 'em coming SMA.

[petebovenzi]

I only wish I lived closer . I could drop off my basket case Sierra .You Rock . Just brilliant

[mattsnook]

'that happens when someone's been pulling it in and out, not lubing it up, nicking the end off the rubber' 🤣😂 that sir is how you become parents....

[adamtrombino]

Interesting that you should post this. I just had an 06 2500 w a 5.3 that had been to 3 shops for a rich code that they couldn't figure out. They replaced o2s, pump, MAF, and oddly enough, intake o rings. Shop before them did coils on bank 2 and full ignition tune up. The 3rd was talking about a new ecm. When I got it, every cyl. on bank 2 showed misfires in history, but only 8 was current. I used my old school Snapper fuel pressure gauge with the scan tool hooked up and ran the balance test. #8 showed a 12 psi difference as opposed to the rest. Honestly, I'd not seen this style injector fail like this before, so your vid is definitely worth watching!

[shawndouglass]

I wish we had a guy like you in our area. I love watching your videos. It's awesome how you do not give up on something until you figure out the issue. My 2003 silverado ss 6.0 LQ9 has similar issue. Spits and sputters. Drives ok for a minute and backfires and pops the next. Had a few local guys try to diagnose the issue and it still hasn't been diagnosed. Has random misfire code. Has codes for running rich and codes for running lean. Just frustrating to keep spending money for people to not figure out this issue. And I have a beautiful truck sitting in the garage that I can't even drive. Once again. Awesome job the people in your area hopefully realize how nice it is to have you for such issue. Stay healthy and stay positive

[scottxp]

I can't help but appreciate how thorough your are, personally I would just watch fuel trim corrections. If ltft drops to + or - 5% I would ship it. Also change the oil if it smells "gassy" from the #6 overfueling...