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  1. XJ Cherokee Technical Forum
    Hey everyone, A bit of background, I have a 91 XJ with a 4.0 block (4.7 stroker) and quite a few other modifications. It was running and has always run fantastic with the stock ECU, higher fuel pressure and upgraded injectors (runs clean enough to pass California emissions). Yesterday, I...
  2. XJ Cherokee Technical Forum
    Expert advice please! ’97 XJ Grand Cherokee, Anti-theft system, no power / ground to Injectors Hi from sunny South Africa. I hope there is someone on here who has expert knowledge of the ECU and Anti-theft system on this model. (SA Export model) Background - Overnight the XJ developed a...
  3. KK Liberty Forum
    Hi all, My 2012 KK is not charging. I think I need a new PCM, and I'm curious if I'm missing anything before I go buy a new one. The day I first got a low battery signal I replaced the battery, original was 10yrs old so it was time anyway. After I put a new battery in, the alternator got REALY...
  4. TJ Wrangler Technical Forum
    Hello. Jeep Wrangler 2004, 2.4L MT. I have replaced the electronic engine control unit. It needs the right setting because it doesn't work properly. We are unable to install the software update. We use HP tuners for Dodge. It has worked 10 times so far, but the menu for adding software does not...
  5. YJ Wrangler Technical Forum
    Just finished dropping in a reman 4.0 in my 93 YJ and for the life of me I can't figure out what's going on with the electrical gremlins that were never present before the swap. Initially, I was getting a crank, no spark condition with error code 11. ASD relay worked and fuel pump primed for 1-2...
  6. XJ Cherokee Technical Forum
    I'v been doing some searching, possibly ♫♩ in all the wrong places ♪♫, and cannot find a diagram for the ECU/ECM for my Jeep. The goal is to see if one can be scratch-built. I know that in another forum, for Subaru, one user had made on using a Rasberry Pi. I'm looking to go a little more...
  7. TJ Wrangler Technical Forum
    So I’ve almost completed a multi-year TJ ground up build. Background: Started with a Bare 2000 TJ chassis sitting on jack stands. Stripped frame of all paint and bracketry. Designed a double triangulated long arm rear suspension, long arm front. Welded all new brackets on. Put Cherokee high...
  8. YJ Wrangler Technical Forum
    I was driving the other day and shortly after I got fuel, my tac, speedometer and all of my gauges went dead. I thought/hoped it might be a loose fuse & continued to drive her for about an hour and then I started to loose a little power, she just couldn't maintain 75, I was driving on the...
  9. ZJ Grand Cherokee Forum
    Hi all I have 1997 JGC 5.2 limited edition. Couple of months ago, oil cooler of transmission was damaged and coolant in the radiator is mixed with transmission oil. After that we replaced the radiator and transmission oil. But transmission was damaged. After we rebuilt the transmission my...
  10. XJ Cherokee Technical Forum
    Heyo, let's start with the background of the issue with my 1991 Cherokee. 1. Fuel pump function degraded over time, would only prime at key on position under ideal temps. After much troubleshooting, which included replacing the entire fuel pump assembly and triple checking all of the grounds, I...
  11. YJ Wrangler Technical Forum
    I have a 90 manual wrangler with a 4.2, I recently did the head swap and fuel injection using parts from a 4.0 Cherokee. After doing the swap, I was able to get the jeep running, but only without the alternator fuse in. When I would put the alternator fuse in the pdc, the jeep would start, but...
  12. TJ Wrangler Technical Forum
    Hello, I have a 1982 Jeep CJ7 that I have swapped a 2003 TJ 4.0L engine and transmission into. I'm trying to supercharge it, but have found that the computer isn't re-flashable even though it's OBDII. What have most people done in order to supercharge or turbo the TJ 4.0L's? I know doing a...
  13. TJ Wrangler Technical Forum
    Hello Guys, I have a TJ 4.0L from 1999. I have a damaged ECU from a car crash. The current ECU has the part number P56041 - 471AD. Now I can buy an ecu with the part number P56041 - 520AB. Will this work on my car? If not, what numbers will do match for me? What does the last digits say? I...
  14. TJ Wrangler Technical Forum
    My wrangler is throwing like 5 codes and 4 of them are saying that a possible cause is my pcm has failed. :rantscream: So i am looking for a computer for a 97-06 2.5l manual jeep that is under $300 and none of junk yards around me have any that will match
  15. Jeep CJ Forum
    i have a 1984 CJ7 with a 4.2 258 i6, i want to get rid of the ECU this summer and i was wondering what the best arb and distributor to get i am thinking a HEI distributor and a weber 32/36 DGEV. since i am new to the whole wiring thing i was wondering if you guys had any input, thanks!
  16. WJ Grand Cherokee Forum
    I've got a 2003 Jeep Grand Cherokee with 160,000 miles on it. The problem I have is I've got a bad catalytic converter, my mechanic said that my Jeep is from California so I've got to replace it with another California cat which is 700 dollars. I've found that a normal 49 state cat is like...
  17. YJ Wrangler Technical Forum
    Hey everyone, I live in PA and winter is almost here. As it gets colder, my 93YJ is getting harder to start. I read a lot of threads and determined its probably a bad fuse connection. Inside the fuse box of the engine compartment is a white powder. Im assuming a bit of oxidation on the metal of...
  18. YJ Wrangler Technical Forum
    I took my jeep to my mechanic and they diagnosed it with a bad ECU and told me I need a new one. I am used to doing my own work and I don't feel that they properly examined the issue.. Symptoms: Popping in the exhaust, off timing, difficulty starting after sitting for a while and over all lack...
  19. XJ Cherokee Technical Forum
    Okay so long story short, Ive been having a recurring misfire in one of my cylinders and have tried nearly everything to correct the issue. I took my car to a mechanic to have some tests run and he is suggesting that the PCM is sending the incorrect signal to that particular cylinder and...
  20. YJ Wrangler Technical Forum
    Hi, new to the forum, this is my first post. I was hoping to bend some experienced ears on the trouble I've been having with my 4 banger jeep ('93 YJ2.5L) SYMPTOMS: -My engine will occasionally sputter like it is running rich and I lose power, then it clears up -My temp gauge or temp sending...
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