4.0 engine

Hello everyone, Long time lurker who's appreciated the wealth of knowledge from this forum! Over the course of several years I took the knowledge gained from reading forums on repair and restoration work and I was able to overhaul quite a bit on my TJ throughout 2025. Some backstory; My TJ was...

I bought my 4.0l Auto TJ Sport new in 2001 and have always taken good care of it. At 275K miles it has developed a bad rattle. Also, if it sits for a few days when I start it up it takes 5ish seconds for the oil pressure to build, long enough for the check gauges alarm to go off. Once the oil...

This is my 2001 Jeep Wrangler TJ 4.0 5speed that I have slowly been building over the past two years as my daily driver. I bought it from one of my family’s friends for $4000 and have been throwing parts at it ever since. I recently bought a 2003 Jeep TJ Rubicon that I plan to build out as a...

I purchased my jeep years ago as a 4.0 Jeep but was curious if this was an original AMC engine. Not sure what the codes mean. I posted two picture as a reference.

After putting up with a long crank time for a little under a year now, I finally started getting misfire codes. I suspected it was losing pressure at the rail because the injectors had 120k miles on them and the top of the intake manifold and around the injectors was FILTHY! The rough starts got...

I dug through the other threads and did not come across one that is similar to the issue I am experiencing with my 32RH. Here is the list of notes/things ive tried. Notes/Things Ive tried from other threads - 2001 Sahara 4.0 w/ 32RH - 29" wheels with 3.Slow7 gears - Rebuilt prior to purchase -...

So I was driving my tj and all of a sudden the rpms dropped and would not start again, before this it was stuttering while driving but I didn't think anything of it, had it towed to an oreillys, replaced the crank sensor and still nothing jeep has 169k, fuel is going to the fuel rail, but...

Hey everyone, I've been on a rollercoaster journey with my 2003 Jeep TJ Sport over the past three years and am now at a crossroads, looking for some wisdom from this knowledgeable community. Current Configuration: 2003 Jeep with a 4.0 engine, 42RLE transmission connected to an Atlas 4.3:1...

The other day the cigarette lighter was not working so I tried to replace a fuse to get it to work. It did not work. Then after that my heat wouldn't blow no matter what setting you put it on. I tried replacing the fuse behind the glove department same thing it didnt work. Its a 99 wrangler with...

My 2004 Jeep LJ automatic is having some trouble sometimes on startup, the engine will shake pretty hard, and it sounds like a pretty bad misfire, but when I turn the key off, and restart the engine, the problem usually goes away and it runs smooth as normal. This has been occurring on starts...

Hey Guys and girls, my daughter blew my TJ and i mean grenaded it. With that said i have been looking for a while and found 3 builders i would like to choose from and would like to know if anyone has any personal experience with any of them. here they are and i welcome all of you opinions. 1...