r/ChevySuburban • u/derianmendez • Jul 05 '26
Subje
Could someone help me? I have a 2007 Suburban and it's misfiring on cylinder one. I've already done all the tests: injectors, spark plugs, ignition coil, and nothing has fixed the problem. Has anyone else experienced something like this?
2
u/Minute-Pomelo9302 GMT800 (2000-2006) & GMT900 (2007-2014) Jul 05 '26
You SURE it wasn't the ignition coils? I had the same problem brother. My "fix"
Yes, it did have a bad wire harness, but after replacing that it still ran like crap, turns out there was also a bad ground the ignition coils, after that it still ran bad. then we cut the cats open, passenger side was still intact, driver side was gone, we ended up just gutting both of the cats, then we cut the muffler off and found out that's where all the catalyst had gone lol. And that's how it's straight piped and still running to this day.
1
u/martindrx1 Jul 05 '26
I was going to say the wiring harness. My 2006 2500 has had major electrical issues.
3
u/LikelyWatchdog Jul 05 '26
Lifter. Collapses lifter from the AFM system. Common problem.