Greetings. 96 limited with the 4.0. I'm having misfiring issues. It all started after I neglected to replace my worn motor mounts. I have an eBay APN style header and it would hit the motor mount bracket. I have since replaced the driver side mount and at first, I thought that was main reason for all of the vibration inside the jeep. At one point, I had p0304 code but it hasn't came back. All of the following relevant parts have been replaced in the last year:
- New Reman Distributor
- Cap, rotor button, plugs and wires.
- MSD Coil
- Injector at #4 (This was replaced out of desperation)
A few more things to point out. I have compression tested the #3 and #4 and got 40psi.
Today, I'm going to check the rest of the cylinders to see if its a universal 40, so I'll let you know. Today, I ran it up to temp and noticed bubbling at the intake/exhaust manifold gasket. Would it be plausible that my intake gasket is toast causing the loss in compression? I'm thinking that when that exhaust manifold was hitting the motor mount bracket, it may have caused stress points on the gasket. I could be wrong, but just throwing it out there.
I have also noticed a loss of coolant; however, I think that may have to do with the water pump as I noticed dripping near it. I also fear it could be the valves or piston rings. Can anyone shed some light on my situation? This has been the worst ZJ I have ever owned. Always something with this one.