4.0

  1. Q

    New owner of 2000 TJ 4.0: What would be a good course of action with this engine?

    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...
  2. KeepinitKeeled

    New rockers still have some wiggle at FSM torque

    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...
  3. Clocktower07

    SOLD 2005 Patriot Blue LJ - $17,000

    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...
  4. T

    No spark: how to tell if crank position sensor is bad?

    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...
  5. SolarYellowshortbuss

    Mystery electrical issues

    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...
  6. SolarYellowshortbuss

    Electrics issue engine not starting

    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...
  7. C

    4.0 oil pressure gauge and fuel pump

    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...
  8. SolarYellowshortbuss

    Rough idle and takes a minute to get going

    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...
  9. C

    4.0 A/C leak

    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...
  10. SolarYellowshortbuss

    PCM failure?

    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...
  11. SolarYellowshortbuss

    Jeep randomly doesnt wanna start

    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...
  12. SolarYellowshortbuss

    4.0 doesn't wanna turn over good when cold.

    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
  13. L

    97-06 4.0 automatic wiring harness differences?

    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...
  14. J

    Junkyard motor or crate engine?

    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...
  15. MrV7

    Transmission Reinstalled, Jeep won't start

    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...
  16. W

    Input shaft not aligning to pilot bearing

    Hey, guys, my input shaft isn't going into the pilot bearing on my '98. 4.0, 5-speed, clutch is lined up it's just that the input shaft will not line up to the bearing. I used the clutch alignment tool, splines are on the transmission shaft. Pictured below is how much I have left to go before...
  17. W

    Hydraulic cylinder attached to steering, I don't think its hydro assist?

    Hey, everyone. I've got what's essentially a stock TJ here and it has this cylinder attached to the steering. These are pictures taken from the modded one I bought, swapping engines and lift and all due to bad frame. They both have this, and I don't think it's hydro assist, because it looks...
  18. G

    Bad Manual PCM?

    I have an 06 4.0 manual that is bone stock (yes, original owner). When starting out, the Jeep has started to stall and even die (pretty embarrassing in traffic). When it dies, depressing the clutch will not save it, but it will fire right back up. After a couple months of very light driving, it...
  19. D

    Is there anyway to get a 4.0 to sound good at all?

    I’m a big fan of Jeep 4.0 so I can’t bring myself to change out the engine but a sick sound matters a lot to me I’m not sure why but it just does, I’ve been told that there isn’t a way to get it to sound good but I figure I’d ask you guys instead of just a bunch of locals thanks in advance.
  20. B

    Utah Sold

    The TJR has been sold. Thank you to all the great members on this site, maybe one day I will be back