I have a code showing for cylinder 5 misfire?

2016 CHEVROLET TAHOE
184,000 MILES • V8 • 4WD • AUTOMATIC
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PMARTIN6
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For the misfire. I have a code showing for cylinder 5 misfire. Changed the plugs and I changed the number coil pack and still having misfire. You can't notice it unless it's at idle or speeds below 40. No taping or ticking noises, just a rough shake. Before I spend more money on things that don't work, I need directions about what to do next. Also, the back air isn't working. I need some direction. I just bought it and didn't realize it has these problems and now I'm wanting to pull my hair out. Please help. Thank you !
Jun 3, 2023 at 8:32 PM
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STRAILER
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We only handle one problem per thread. We need to remove the spark plug to see what it looks like, if it is clean or like new there is no fuel getting into the cylinder and the fuel injector needs to be changes out here is the instructions so help you do the job and I have included this guide which may help as well.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

You will need to remove the intake manifold which I have included instructions on as well. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.



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Jun 5, 2023 at 10:21 AM
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PMARTIN6
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Okay. I apologize, I was trying to do two things at one time. I have already changed the spark plugs as well as the coil pack. When I removed the spark plug it wasn't clean and it did have fuel on it. Like the fuel wasn't burning off it. When I get a chance, I will record it and see if you can here the rough idle. It runs fine except at idle or speeds below 40. Done an oil change and there was no evidence or water or fuel in the oil.
Jun 5, 2023 at 10:38 AM
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STRAILER
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Yep, it sounds like a bad/weak fuel injector, if it was not firing you would have raw fuel on the spark plug.
Jun 6, 2023 at 7:46 AM
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PMARTIN6
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So, I have now changed the wires on the new plugs along with a new coil pack. After changing the wire today, it did seem to run a little better for a while. I got home and let it idle. It still had the slightest shake and was running smooth and maintaining RPMs. After about 8 minutes or so it changed. It started to shake more and idle rough. The check engine was flashing. I could smell gas, so I gave it some gas and held it at 2 grand for about 1 minute and then it smoothed back off again. Driving it home it ran smooth. So I do for sure now feel that it is a bad injector. So hopefully will be changing that this weekend and see what happens. After that if it don't solve the problem I don't know what else to do. So fingers crossed and prayers said that this fixes the issue.
Jun 8, 2023 at 2:57 PM
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STRAILER
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Yep, yep! it sounds like you are on the right track, please let us know what happens.
Jun 9, 2023 at 10:57 AM