Hi XXXXXXX,
Thanks for using Just Answer for your questions again
Is the code that keeps resetting is it for a particular cylinder? Do you have the code number?
These engines have had problems with the ignition coil's causing the misfire.
The coil is interchangeable with the other cylinders, as a test, swap coils with another cylinder to see if misfire swaps cylinders, this would indicate a faulty coil.
If misfire stays on cylinder # 1 check to make sure injector is recieving voltage and has pulse from PCM on the ground of the injector. Check the resistance of the coil of the injector. Also a compression test on cyl #1 and a couple of the others to make sure this is no the problem.
Any more questions just reply back
Scott
ASE Master Tech/Instructor
20 yrs Experience; GM factory Training ASE Master Certified with L1 advanced engine diagnostics
Because of the Cyl# 1 only misfire, we are looking for something different on this cylinder as to the others, the compression should be close to the others, there are many factors such as temperature and normal wear that might lead to a wrong diagnosis with a specification. the Factory spec for a compression test is around 215 psi with all of them being within 70 percent of the highest reading, With this said I don't want you to tear the engine out if the compression is not 215.
The correct resistance for the fuel injector coil is 10-15 ohms, and it should have battery voltage to both sides with the engine off, because ground is open at the PCM with the engine not running,
I really think your problem is with the ignition coil, but I gave you a couple of other possibilties.
The first step I would take is to swap the coils, clear the code and see what comes back.
Curious if you found the problem yet?