I had to take a break from working on this jeep. Here's the latest.
Got the BT dongle & TORQUE software - AWESOME! Works great - on my 09 Charger & 2013 Jeep JK. that is. It will not work on this 99 WJ (remember that in a minute). It sometimes connects to the BT Dongle, but can never make a connection to the computer.
I got the fuel filter replaced. That was not the problem. I tested the fuel pressure (steady about 50psi), which I beleive is normal.
I'm starting the think PCM. Pulled that last night, cleaned all connections. I actually opened the PCM up too, didn't see anything visably wrong. BTW the PCM is a pretty simple circuit board. There is not much in there to go bad, 3 capacitors mostly & they checked out fine. The circuit board has a conformal coating too. There is no question at all these things go bad (I might have a bad one)! But after looking at my PCM, I suspecting a lot of the quick/ghost PCM fixes actually relate to the fact you are messing with it! Disconnecting wires, moving things around, etc.
But what do I know
P.S. If you would have a bad capacitor in your PCM, you can replace it for a dollar or less if you can solder. Also, if you open the PCM up you will break the water proof seal. Just add a little silicone before you tighen up the screws and your good to go.
Last PCM notes -
1) use an air hose (low pressure) or other method clean out the area where the PCM is at. Just get as much dirt/dust/rust out of there before you start to work. That will help to eliminate the chance of anything getting into one of the electical connectors you have to remove, etc.
2) get electrical parts cleaner (lots). Clean out all of those electrical connections, if you open the PCM up, you can clean that as well. Mine looked bad on the outside, but like new on the inside.
OK. Sorry for the long post. Just sharing info!
So, my fuel filter is fine, fuel pressure is good. PCM could be bad, but it looked OK upon visual inpection.
Back to my problem. My jeep either will not start, or starts for a second, runs rough and dies. Lately - NO CODES! Nothing, except occassionaly now a FLASHING LOW FUEL LIGHT and/or that WRONG KEY light. I don't get these all of the time now, but they consistantly show up say 25% of the time.
I searched and can't find anything related to a "flashing low fuel" or "wrong key" light that could cause this problem.
So..... remember that BT dongle not being able to read my PCM I mentioned earlier. That works on my other vehicles & it should work on my 1999 WJ (OBDII). So, I'm now thinking I might have a wiring problem (possibly between the OBDII port and the PCM (basically inside starting with the PCM wire bundle behind the glove box). OR I have a bad PCM (some non-capacitor failure or "corrupted software").
I'll check the wiring and update this thead. Also, if I order a PCM online who would you recommend? I would like to get one already flashed.
Thanks - and one last question. Do you think I should start a new thread? This problem has evolved beyond the "Transmission Band" adjustment that I was orginally 90% sure caused the problem!