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    2003 KJ 3.7L Spark Plug experimentation

    I'm glad you added this note because it is an important step whenever any tuneup work is done, and I should have made a point of including it. Short answer, yes, I always drain PCM/TCM static memory. But I use the crossed cable method: (A) disconnect neg terminal, then (b) diconnect the pos...
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    2003 KJ 3.7L Spark Plug experimentation

    Thank you for correcting post placement as needed.
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    2003 KJ 3.7L Spark Plug experimentation

    I accidentally posted this to the KK forum 1st... reposting here I recently solved a rough engine performance problem by some spark plug trial and error. I had responded to someone else's post, then discovered an error I had made regarding diagnosis/recommendation, and did an edit/update to...
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    2003 KJ 3.7L Spark Plug experimentation

    I recently solved a rough engine performance problem by some spark plug trial and error. I had responded to someone else's post, then discovered an error I had made regarding diagnosis/recommendation, and did an edit/update to that response. What follows is taken from that correction, and may...
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    Rich air fuel mix problem

    ***Self-admitted disinformation*** Problem solved. Spark plug gapped too tight. Was .034 and it should have been .044. Not enough spark to fully combust. The truth is: 1. The underlying problem was *only parrtially due to* the plug gap set at .034 (which I found one reference to as being...
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    2002 fuel tank flange

    2002-2004 KJs all have that same white cover plate. Do you have local salvage yards? If yes, and the wrecks are off the ground so you can get under them, a pair of side cutters will release the holding straps to drop the tank and enable you to remove the plate. With cut straps and the tank on...
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    Fuel tank swap

    Ok... the preceding post was "stream of consciousness". Disregard. I looked up the fuel pump for a 2007, and my advice is now: "don't mix and match tanks". If you have a fuel pump problem, (a) buy a new locking ring Mopar 52100409AB because the old one is probably rotted, (b) buy a Crown...
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    Fuel tank swap

    Things to look out for: 1. Fuel delivery plumbing. 2002-2004 definitely has a fuel pump *inside* of the tank with an external connector back to the PCM, fuel filter outside with 2 specialized fuel line connectors, and a leak detection pump with a connector back to the PCM. IOW, specialized...
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    Fuel filter in 2004 jeep liberty HELP PLEASE!!!!

    Oops, skipped past your post that you were replacing the pump too. Smart move. Beware of that metal seal ring though....
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    Fuel filter in 2004 jeep liberty HELP PLEASE!!!!

    The fuel pump from Quadratec comes with an exact fit rubber gasket that mates to that metal ring, so all you need is a clean metal ring for the tank seal.
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    Fuel filter in 2004 jeep liberty HELP PLEASE!!!!

    If you are going to the trouble of dropping the tank... I advise that you spend another $150 out on Quadratec.com, and buy/install a new fuel pump. The blasted thing is internal to the tank. THERE IS A CATCH HOWEVER... there is a metal locking ring that seals the tank, and that ring is...
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    CEL - Cylinder Misfire

    Link to that checklist I mentioned: https://www.jeepkj.com/threads/engine-replacement-checklist-kj-2002-2003-and-maybe-2004.80359/#post-809316
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    CEL - Cylinder Misfire

    Swapping in a brand new PCM from Flagship didn't work for me unfortunately. In my case I think it was cumulative wear and tear from 305K mileage. Had corroded wire insulation, plus dying injectors, coils MAP, TPS, and a mixed bag of unreliable chinese junk parts installed by various local...
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    Random multiple error codes and noise after engine replacement.

    @Ksat, that makes total sense otherwise a noid light wouldn't work while doing a test...
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    Random multiple error codes and noise after engine replacement.

    The PCM is a "living" machine. It is constantly receiving and interpreting feedback information from all of your sensors... plus the TCM (trans control module)... and constantly adjusting engine behavior. If you do a swap, you need to go over the complete checklist I posted regarding...
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    Help! 2002 jeep liberty 3.7 *** P0201

    Any chance a mechanic has recently replaced injector #2? If "yes" and the replaced injector is not either a true new-in-sealed-box Mopar or Bosch part... then its probably a garbage aftermarket (or "rebuilt") injector will generally go bad after a couple of weeks/months.
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    Engine swap stumbling badly 2002 KJ 3.7 2 Whl

    I went through 2 AC compressors in the last 8 years. Aftermarket seems to last about 6 years.
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    Engine swap stumbling badly 2002 KJ 3.7 2 Whl

    If you need any kind of sensors, injectors, electronics, etc... and you are unfamiliar with Quadratec, recommend that you go here... https://www.quadratec.com/ ...they sell nothing but top-shelf OEM parts that are 99.999% Mopar equivalent and reliable. If you use them, look up the recognized...
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    Engine replacement checklist KJ 2002 2003 and maybe 2004

    I think what you are talking about is the *sensor* at this point... not the cam/crank, right? If so, I strongly recommend that you buy any/all *sensors* from either (a) Mopar directly, or (b) https://www.quadratec.com/ . Quadratec sells Crown Automotive manufactured OEM parts that are...
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    Engine replacement checklist KJ 2002 2003 and maybe 2004

    Observations: If your original engine blew a ring, or anything else that caused filthy/smokey exhaust, that will trash your O2 sensors and catalytic converters. This will cause all kinds of runtime problems. Any good garage should be able to diagnose a bad cat. Use new, sealed box upstream...

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