2014 GMC Truck Misfire Diagnostics With Known Good Part
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- čas přidán 17. 12. 2022
- I diagnose a #1 cylinder misfire on a 2014 GMC truck with a 5.3L engine. I swap #1 and #3 spark plugs. Still has misfire on #1 cylinder. Checked #1 ignition coil for spark output. No spark. I swap #1 and #3 ignition coils. I have spark output on #1 cylinder but not #3 cylinder indicating that misfire moved with the coil and coil is faulty.
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I am having the same issue with my 2014 Silverado. This was very informative! Those old wires are such a pain to get off without damaging the aluminum heat shield!
Thanks for taking the time to make this video, I have a 2015 Silverado with 37,500 miles has the same problem. This video will help me to fix my truck, thanks so much🙏
Glad it helped. Thanks for watching.
You were absolutely perfect. Thank you for sharing. You did an amazing job with your explanations and video. I need to research this for a mis fire. I was wondering if it was a coil or an injector. Thanks again!
Thanks for watching.
information really helped thanks!
Glad it helped. Thanks for watching!!
Very helpful thank you
Thanks for watching!!
I have a 14 Silverado with 41k miles. This seems like the problem I’m having.
Very nice work! Thanks boss
Thanks for the feedback and thanks again for watching!!
easy instructions. thanks
You bet!
Should have moved plug wire & coil also evap solenoid probably bad .. which allows it to draw fuel vapor from tank which is not metered by pcm
Should have watched the whole video!!!
You mentioned not hearing the lifter, having this issue on an 07 Sierra with a cylinder 4 misfire. Changed plugs, wires, and coils already but the lifter is ticking. Any diagnostic tips?
Collapsed lifters are an issue on these engine. Diagnostics as shown in the video is just a simple way to check some of the basics without throwing parts at it. If you have a known good firing cylinder you can swap ignition parts between the misfiring cylinder. If nothing changes, then it's not ignition related. Then you go to the next step. Injector flow test, compression and cylinder leak tests. If your hearing a tick in the valve train, the compression and cylinder leak test will identify the issue. If it fails a compression and cylinder leak test, the next step would be to remove the valve cover and check valvetrain. Thanks for watching!!
I have replaced plugs wires still have misfires on number seven and replaced ignition coil on seven what could it be
Did you verify the misfire on #7 with a scan tool??? If so did you have spark output on that cylinder? If so, you need to check compression and fuel on that cylinder. Thanks for watching!
What about checking the spark directly out the coil. Could of been a bad spark plug wire
Checked that. No shorting "arcing" through the wire. Thanks for watching!!
I have a random misfire on my 2014 silverado , l have spark on all plugs , what else could it be ?????
Could be a lot of things. You would need a scan tool to look at engine data. I would recommend starting with checking misfire data and what cylinders are effected. Then I would look at fuel trim to what that is doing and go from there.
What Autel model were you using?
MS 909. Thanks for watching!!
In my case after swaping plugs, wires and coil, its still showing same plug, any idea what to check next?😅
Sounds like a mechanical fault in the cylinder. Check fuel injector then compression test and cylinder leak test.
Yup I’m in the same boat currently. Moving onto the fuel injector next. We’re you able to find out what your issue was?
The #1 ignition coil was faulty. Thanks for watching!!
@@luismejia5448changed fuel injectors still have a misfire on number seven
@@luismejia5448 any luck ?