When I purchased the Cookie Cutter TJ, I thought for sure I would be replacing the motor as it was purchased with “oil pressure issues”. Even though the thing lost oil pressure while running down the highway, it seemed to have oil pressure at low rpms. Puttering around the neighborhood showed no signs of distress in the motor department. So before condemning the motor, I went ahead and dug into it to see what was going on.
“Ah ha!” I thought, “There is some plastic things under the valve cover (PCV stuff), one of those must have failed and gotten munched up!” So I pulled the valve cover only to find all was well under there:
That mark is the same diameter as the oil pickup! What seems to have happened is that the oil pain met a rock at some point in its life, pushing the bottom of the pan very close to the oil pickup. Time passes and as the motor started to sludge up a little bit (there really wasn’t much), the “pre sludge” clogged up the oil pickup to the point that running down the highway starved it for oil. Thankfully, the crank and bearings were still good, so I just started cleaning things up:
Then I started the nasty process of getting rid of all the shotty wiring. Of which some was from the PO, and a lot of it was poor design from Chrysler. Melted junk everywhere, how did this not burn to the ground!:
The Motor Mount Lift mounts that were on the TJ when I bought it made things way too buzzy for me. I’m sure they’re fine in the 4.0 application, but the 2.5 was a bit much. So I made my own lift with stock mounts. Much smoother:
I’ve been daily driving the thing for awhile now working on getting rid of all it’s remaining quirks. It’s a pretty solid package at this point, and I’m hoping that we’re nearing the end of the maintenance portion of the project and getting close to the improvement portion of the project.