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This is sort of a re-post of the same problem I have been having for some time. '00 XJ Sport, 4.0, AW4 tranny. Stock except for OME lift. I commute, at 80mph, 36 miles nonstop, each way daily. Recently the jeep has been "hiccupping" for lack of a better term. It stops pulling for just a second...

HELP! Daily driver, 2000 XJ, 4.0, stock engine except for replacement Tupy head off of a Wrangler. A little over 200,000 miles on lower engine and tranny. XJ has Cruise Control, Stock AW4 Tranny, NP231 Transfer, OME Lift. Pretty normal Jeep. I take care of it well, it is my daily driver, and I...

My 4.0 is stock with 170,000 miles on it. Recently I got a salvaged 2005 Wrangler TUPY head and had it remanufactured and put on the XJ. I had the pan pulled and the oil pump replaced at the same time. After this partial rebuild, the cold start/run oil pressure surges up to 75-80 psi under...

2000 XJ with a 4.0. 175,000 miles. New head. FSM says HOT idle oil pressure at 11 psi is within specs. Chilton says HOT idle oil pressure at 13 psi is within specs. (I got this data form forums, NOT the actual manuals.) My question: Is that number the recommended factory expectation in a...

I have not actually pulled the head from my 4.0. Nor am I a mechanic, other than shade tree. So feel free to laugh at me...but while doing so, please actually answer the question and educate me. Will my new, salvaged head include lifters? Thanks. JG

I have seen many threads where people say "Just purchase a long block and be done with it." I can't seem to agree. I would like some input please. It is my opinion that ALL parts sold in parts stores are cheap parts, mostly made in China (etc), with Napa being the best of the bunch. As I get...

I have the dreaded 0331 head. I am about to grab a 2003 (new version of 0331 head) from a salvage yard and take it to the local machine shop and have it cleaned/gone through. Question: Is this head a DIRECT SWAP? I have heard of having to move the temp sensor to a different port because it will...

First: THANK YOU for taking the time to read this post. I am a long-time member of JeepsUnlimited forums but new to NAXJA. I am really in need so I came to NAXJA, looking for new friends who may be able to help. This post is quite long because I wanted to be very thorough. Second: YES….not...