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  1. Jeep Wrangler Forums
    I have a 91 yj (2.5) with a 2000 xj motor in it. I've swapped all sensors and added the distributor. lengthened and added my extra injector wires. and a 95 xj ECM, I've checked pinouts but some are different names or do different things. I got it to crank over but it doesn't stop unless I turn...
  2. Jeep CJ Forum
    Ok, trying to plan out my future 4.0 swap into my running 1980 CJ-7. I’m not looking at specific “how-to’s” as there has been a ton of documented stuff on here, but more opinion of the parts choices and combinations. Like many of you I’ve collected parts over time and haven’t decided down a...
  3. YJ Wrangler Technical Forum
    I am in the process of swapping a 1993 cherokee 4.0 motor into a 1990 yj which previously had the 4.2 liter. It is a pretty rough jeep and only going to be used on trails and around the property so I am fine leaving it pretty rough around the edges as far as wiring and look. What I know...
  4. Jeep CJ Forum
    Hello all! I have completed my 4.0/AW4 Swap in exception to the wiring issues. The wiring harness is an 87 YJ and the donor is an 01 XJ. I Have an OBD2 port wired up to the ECU, oddly enough only an 01 GC computer will link up and gives a VIN error code, both the original ecu and the replacement...
  5. XJ Cherokee Technical Forum
    A week ago I bought a 1998 Jeep Cherokee Limited that had a bad motor. I had originally planned to rebuild the engine, but today I found a 1995 Jeep Cherokee Sport with a 4.0 and 133k miles for $500, so I bought it to serve as a donor. However, before I start pulling parts I wanted to know what...
  6. Audio, CB/GMRS/Ham Radios, GPS, & Electrical
    Hello everyone. New to the forum. I know it has been done hundreds of times and this subject has been discussed to death, but it seems like every write up I read is completely different. I'm considering a possible Cherokee 4.0/AW4 conversion into my 2.5 89 YJ and I'm trying to figure out as...
  7. Engines & Drivetrain
    Hello everyone. New to the forum. I know it has been done hundreds of times and this subject has been discussed to death, but it seems like every write up I read is completely different. :confused: I'm considering a possible Cherokee 4.0/AW4 conversion into my 2.5 89 YJ and I'm trying to figure...
  8. YJ Wrangler Technical Forum
    I have a 2.5 setup in my yj now and have the opportunity to get a 2001 4.0 harness aand ecm what are some of the issues I will run into doing this swap
  9. TJ Wrangler Technical Forum
    I swapped a 2003 4.0L engine complete with computer and wiring harness into my '82 CJ-7, and I'm having a lot of trouble finding all the pinouts and wiring diagrams of the wiring harness (with wire-colors). Can anyone help with this? I've only found 2 pinout diagrams so far for the model year...
  10. YJ Wrangler Technical Forum
    Last week I bought Jennifer, an 87 wrangler with around 5 miles on the rebuilt, swapped 4.0. It sounded like it wasn't firing on all of its cylinders at the start of the test drive, but a couple minutes later it sounded fine, just sorta sounded like the timing was out, and we noticed it didnt...
  11. YJ Wrangler Technical Forum
    Just finished up getting my jeep back together after doing a 4.0 swap with a motor/ecu from a 93 xj. Im getting fuel at the fuel rail but no spark and no power to the coil. Ive changed the crank position sensor to one from my 2.5 that worked when I pulled it. Could this be my problem? Is that...
  12. Engines & Drivetrain
    I have an 89 yj that has a 90 cherokee 4.0, I got it swapped everything from cherokee is in there that needs to be and is running great. I bring it to the referee and he looks at my engine and fails me due to the vacuum connector on the intake that is right after the 180 degree turn at the...
  13. XJ Cherokee Technical Forum
    Hi all. I have a lot of issues with my 1988 XJ 4.0. Knocking, LOTS of oil blow by, and general rough running. I am thinking about doing a full rebuild or replacement. I found a 96 XJ HO 4.0 for pretty cheap which comes with the computer, wiring harness, intake and exhaust. I have read up on the...
  14. TJ Wrangler Technical Forum
    I swapped from a 2.5L to and 03 4.0L and im having trouble with the cab side of the harness. anybody with a 4 banger 99 mind telling me which color plugs go in what order under the dash and beyond that point what is the purpose for each plug. Thanks in advance!
  15. Engines & Drivetrain
    I have a 82 CJ7 with a 4.2 and a 4spd T3-51-097-901 transmission, I bought a 4.0 from a 96 Cherokee that had a automatic transmission. Can I use my trans with the 4.0? And how do I get them to match up if I can?
  16. YJ Wrangler Technical Forum
    gonna start the build thread with a little mechanix porn--scroll to the beginning im mainly gonna post the rebuild pix. the two sexiest things ive ever seen is a a woman in waders and a woman turning a wrench. this was day 1. this is my girl helping me pull the 2.5L i could never decide...
  17. XJ Cherokee Technical Forum
    Ok guys, more than likely I am going to be getting an entire parts jeep for some miscellaneous big parts and spares of others, it's a '99 and I already have my project which is a 2000, unfortunately body wise my 2000 is in better shape or I would be building up the 99. However, I want to swap...
  18. XJ/MJ Cherokee Non-Technical Forum
    Ok guys, more than likely I am going to be getting an entire parts jeep for some miscellaneous big parts and spares of others, it's a '99 and I already have my project which is a 2000, unfortunately body wise my 2000 is in better shape or I would be building up the 99. However, I want to swap...
  19. Jeep CJ Forum
    Hey guys, I am finally ready to upgrade the engine in my 81 cj7(258/t4/d300), and after weighing all of the options have decided on the 4.0 w the aw4 mated to my existing d300. I have read many threads on this swap, but have not found anything on the figment inside of the vehicle. I am...
  20. YJ Wrangler Technical Forum
    Hey all. I've had my YJ for ~10 years now, and the 4 angry squirrels have seen their days, with 213,000 hard miles on the clock. While she still runs very well, she starts hard, gets 10mpg, and burns oil. I bought a '94 4.0, AX-15, transfer case, ECU, & wiring harness for $1k. There are...
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