4.0

Hello team, I bought an LJ with 140,000 miles that looked super clean and without leaks. After driving it hundreds of miles home and a few miles in town, there is a clear coolant leak. It drips down along the oil pan and creates a big puddle. It does this even if it hasn’t been driven in...

Hey guys, first time poster here. Bought my '06 4.0 (auto trans) a little over a year ago. Had a lit CEL for a faulty o2 sensor when I bought it. Recently the CEL has begun flashing, but only at idle once up to operating temp (wont flash at idle from cold start). It also starts to smell like...

Back in '22 I made the mistake of buying someone else's project Jeep on FBMktplace. After 2 years of fighting the combination of a patchwork frame and a myriad of electrical gremlins, I finally got the shits and decided I would start hunting for a project to call my own. Around the turn of the...

I’ve been having the common heat soak issue when starting after the engines warm so i ordered the Design Engineering fuel rail cover kit to try and help with that. I was looking around the engine today and noticed 4 out of my 6 injectors have some pretty decently sized cracks. Now my jeep is...

Have a buddy just posted this on FB 2002 Jeep Wrangler Sport TJ. Gray. 5 spd, 4.0. Dana 30 front. Dana 44 back. Lunchbox lockers (Aussie Lockers) front. Spartan locker in rear. Cav fab adjustable control arms (upper and lower). BK Fab works high clearance crossover steering. Metal cloak track...

Hello, I have been going through lots of posts here.. We just inherited a 2000 TJ from my late father in law. I unfortunately do not know the full history of the vehicle. He was going to give it to my son when he turned 16 and then he passed away a year ago. My son just started driving it a few...

Hey all, Long time lurker to the forum, so first want to thank you all for the incredible wealth of knowledge contributed here — I've been able to learn so much from all of you and have tackled tons of projects I would have never thought were in my wheel-house five + years ago. So the gist of...

2005 TJ Unlimited / 4.0L / 6-Spd Manual / 136,000 Miles $17,000 OBO *The previous potential buyer was unable to make the logistics work, so the jeep is back on the market!* This jeep will get you anywhere you want to go (and back again) without any drama – in fact, it just completed a...

Morning Yall, I have a wrangler 97 4.0 manual. The last few days my jeep has failed to start when the weather is cold in the morning. (EDIT: Cranks but does not start). If I wait till after work, it starts up (15 degrees warmer). I have just started having this issue now that the weather has...

This is my 49 billionth post on this, but no luck, so I’m going to try to detail every little thing this Jeep has done. It started with, at random, it only cranking. I thought maybe the fuse box being shaken around could have messed up something because when I would mess with it, I’d either...

I thought I fixed my electrical issue to no avail its like chasing my own tail around, I was up at Jeep invasion and my wrangler failed to start so I mess with the relays and I dont know if me shaking the fuse box around on accident or me messing with the fuel pump relay I pulled it and the Jeep...

Hey everyone, about 4 days ago I was driving on the highway and I saw my oil pressure shoot up to 80 psi. Scared the hell outta me and pulled over until it went back down. went back down to about 25 psi idling. changed the oil the next day with Shell Rotella 15W-30 oil. reason for this is...

A guys been foolin with his Jeep for the last 94,274 years it feels and I think I finally fixed my electricamadigitals but now while she does turn over fine and all its a little random for how long it takes and along with that the idle is properly rough she sits at 500 rpms and I dont know if id...

Hey everyone, my ac blows pretty mediocre. Cold, but not cold eneugh for Florida heat. I recharged about 4 months ago and it is pretty consistent with air temp. It’s tolerable but not the best. I tracked down the leak, but I don’t know what this specific part is called. There are 2 places that...

For the past forever ive been having issues with my wrangler from it saying I dont have a fuse, the oil pressure gauge going up and down, to the wrangler starting up very quickly one day to nothing but cranking a few days later. I took it to a fella who ran the codes for me and he says the brain...

Ive been chasing this problem for 2 months now at random times my Jeep doesn't wanna start I've replaced the fuel pump, relays, and made sure the fuel pump connection wasnt bad Ive been stranded twice now and the same thing happened those two time crank crank crank crank crank just refusal to...

My 2003 TJ with the 4.0 has been not wanting to turn over on the first crank when the engines cold it does always start on the 2nd or 3rd crank. Thanks in advance

Hey, I bought a 2002 tj 4.0 with 32rh automatic, the po replaced the transmission(I don't know if he used thr right year model, or if the year matters) but he said after that he couldnt get it to run and said it was not getting power to the fuel pump! He cut and hacked up the factory wiring...

Hi yall! I have a 1998 4.0 TJ with 183k miles, sadly the engine overheated while I was driving one day, took it to a shop, they quoted me 1k to fix the head gasket and resurface the head, I’m debating if it’s worth just investing into a crate motor, I don’t want to replace the head gasket and...

Ahoy! SoI finally got my new clutch, fly wheel, and old transmission/transfer case put back in the LJ. Went to turn her over and she did not want to start. 4.0, 6speed, 231 Battery is reading 12.7, can hear the starter pop out. Shifters in neutral, clutch pushed in, go to turn the key and...