Did some more diagnostics over the weekend. I rented a fuel pressure test kit and some NOID lights from O'Reilly's
The fuel pressure was right on 60psi for all throttle ranges and at idle. After turning off the engine the pressure dropped to 55-56psi within a few seconds but stayed at that level for 35 minutes.
I physically inspected and did continuity checking on all the main ground wires, loosened and tightened them. I checked the resistance of each injector, and I checked the continuity (or lack thereof) between the two leads to injector #1 between ground and each other. Gave everything a good wiggle and physical inspection all around the loom and back around the rear of the valve cover. Everything looked great, all readings were as expected on the multimeter, so I did the NOID light test and everything looked good there, too.
So I pulled the coil rail and plug #1. To my surprise, the plug looks pretty foul after only 6 months since new.
I bought a bore scope a while back so I put that thing to use, and I think I found my issue. Looks like a lot of oil is leaking into cylinder 1 around one of the valves.
The head of the cylinder itself is not in bad shape but it is covered in a thick crust of oil.
The good news (I think) is the cylinder wall doesn't look too bad. I don't see scoring or other indicators of bad rings etc.
So, my Jeep gurus, what is my next step? I am thinking valve cover gasket and valve stem seals, thoughts?
What all should I do while I am in there? Should I run a leak down test and compression test now even though I have seen this issue with the bore scope?
The fuel pressure was right on 60psi for all throttle ranges and at idle. After turning off the engine the pressure dropped to 55-56psi within a few seconds but stayed at that level for 35 minutes.
I physically inspected and did continuity checking on all the main ground wires, loosened and tightened them. I checked the resistance of each injector, and I checked the continuity (or lack thereof) between the two leads to injector #1 between ground and each other. Gave everything a good wiggle and physical inspection all around the loom and back around the rear of the valve cover. Everything looked great, all readings were as expected on the multimeter, so I did the NOID light test and everything looked good there, too.
So I pulled the coil rail and plug #1. To my surprise, the plug looks pretty foul after only 6 months since new.
I bought a bore scope a while back so I put that thing to use, and I think I found my issue. Looks like a lot of oil is leaking into cylinder 1 around one of the valves.
The head of the cylinder itself is not in bad shape but it is covered in a thick crust of oil.
The good news (I think) is the cylinder wall doesn't look too bad. I don't see scoring or other indicators of bad rings etc.
So, my Jeep gurus, what is my next step? I am thinking valve cover gasket and valve stem seals, thoughts?
What all should I do while I am in there? Should I run a leak down test and compression test now even though I have seen this issue with the bore scope?