Well, I took the 3L's PCM back out of the 2.5, put everything back together and tried running the 3L again. I uploaded my mild tune, and let it sit and idle while I was putting the cowl back together and picking up tools. I took it for a test drive and with the exception of once while rolling out of the gate (revved slightly with the clutch in), the PATS light stayed off, and the car would go though the full range. I drove it around for maybe 10 miles on the city streets, then my GF wanted to stop at a friend's house on the way home, so I did. As soon as we pulled out of the driveway there, SOB, the issue was back.
:help:
Besides wiring obviously
, the only other thing that I could try to pin this on is the fact that the car has an older aftermarket Viper alarm system that also seems to have gone haywire since the bucking started. When we went over to our friends' house, I made sure NOT to activate it, but rather to just press the lock button on the door and open it back up with the key, but obviously I still had the problem afterwards. When I say that it went haywire, I KNOW for a fact that it worked before this stuff started because I accidentally set it off on myself twice when opening and closing the trunk with the key (alarm fob doesn't do it :nonono
. The proximity/motion sensor sent out a warning chirp when I opened the lid, and set the alarm off when I closed it. I seem to remember that when I first got the car, the little light flashed sort of like the PATS light, and now instead it is on solid whenever the ignition is off. Now the alarm doesn't go off when I mess with the trunk, and I've actually tried setting it off by rocking the car back and forth with it on, with no success. Also, it doesn't chirp at me when I lock/unlock the doors anymore like it did. I suppose the speaker could have gone dead, but somehow I don't think so. The alarm is a little quirky in the fact that the lock button on the remote both locks and unlocks the doors, and none of the other buttons seem to do anything. I had the panel under the steering column off the other day and all of the connections going into the box where connected at that point, but there is about 8 miles of wires under there, or so it seems. Is anybody knowledgeable about car alarms on these cars and whether or not they could potentially cause these symptoms? Should I have it removed to be safe?
Ray- I will try to hit up a junkyard and steal some TPS and DPFE plugs tomorrow for the hell of it and check out the ignition, as well as try to make sense of my wiring diagrams that I have.