I am not able to get the jeep to the auto parts and get it's diagnostic but I'm wondering if the coil pack could be my problem? I've tried to deduce the misfire for days and have read and tried numerous adjustments, but cannot get the motor to advance and run smooth.
I have a newly rebuilt 89 XJ 4.0L inline 6 cylinder in my 91 Wrangler. I'm still trying to work out the misfire problem. It's never been driven more than a couple blocks. It will idle okay, but to drive it I keep having the backfire in the exhaust when I accelerate.
One thing I'm unsure of is the coil: is it okay to have it mounted to a metal fabricated mount or does it need to be grounded directly to the block? It is wired to alt. and starter could they be wired backwards by chance?
Also, I read the PCM needs to be reset at the dealer if I used the brain that was originally on my Wrangler motor? It seems like the timing is off and it is in the correct firing order. I tried the one tooth forward and back etc.
It does now start and idle at least, but I can still hear a miss in it and something is not right. Could the coil be going bad and fouling the spark plugs?