2014 GMC Truck Misfire Diagnostics With Known Good Part

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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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Опубликовано:

17 дек 2022

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Комментарии : 30

@freddiebarrera7346 4 месяца назад

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!

@gerardoespinoza7202 5 месяцев назад

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🙏

@paycheckmonster 5 месяцев назад

Glad it helped. Thanks for watching.

@user-lb6om9sy8q 5 месяцев назад

information really helped thanks!

@paycheckmonster 5 месяцев назад

Glad it helped. Thanks for watching!!

@allovruracing9404 17 дней назад

Very nice work! Thanks boss

@paycheckmonster 16 дней назад

Thanks for the feedback and thanks again for watching!!

@JamesFerragamo-fu7qm 8 месяцев назад

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!

@paycheckmonster 7 месяцев назад

Thanks for watching.

@CA-nh3ek 11 месяцев назад

Very helpful thank you

@paycheckmonster 11 месяцев назад

Thanks for watching!!

@edlozano8694 Месяц назад

easy instructions. thanks

@paycheckmonster Месяц назад

You bet!

@juanl1900 День назад

I have a random misfire on my 2014 silverado , l have spark on all plugs , what else could it be ?????

@BChev4 3 месяца назад

I have a 14 Silverado with 41k miles. This seems like the problem I’m having.

@ronclaman156 4 месяца назад

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

@paycheckmonster 4 месяца назад

Should have watched the whole video!!!

@lauracallahan8927 Месяц назад

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?

@paycheckmonster Месяц назад

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!!

@philh9238 Год назад

What about checking the spark directly out the coil. Could of been a bad spark plug wire

@paycheckmonster Год назад

Checked that. No shorting "arcing" through the wire. Thanks for watching!!

@webbytwo 7 месяцев назад

What Autel model were you using?

@paycheckmonster 7 месяцев назад

MS 909. Thanks for watching!!

@robertlatta950 Месяц назад

I have replaced plugs wires still have misfires on number seven and replaced ignition coil on seven what could it be

@paycheckmonster Месяц назад

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!