Hey everyone,
I just picked up a 2000 GTP, and I'm loving it so far. Easy to work on, fast (ish), all the cool gadgets, etc. Anyways, car has 227,000 miles on it, so I'm going through it doing all the typical maintenance stuff. I've changed the S\C coupler, new belts, oil change, coolant flush, seafoamed, new thermostat, new 02 sensor, new ECT, and new plugs and wires. It still has a bit of a rough idle and it runs pretty hot. It will randomly throw a P0303 misfire code (which is why I did new plugs\wires), but I don't feel it misfire, seems to run fine. The PO replaced the coil that cylinder 3 runs off of, so I'm assuming that is not the problem. Whats the next step? ICM?
Also, the e-fans are not working, If I hot wire them, they work great. I checked everything up to the PCM, relays, fuses, etc. In my research online, the PCM provides a ground to the relays to turn the fan on, so I disconnected the PCM, grounded pin 5 and 6 (one at a time) and the fans turned on exactly like they should. Fans don't come on at all (A\C on or not). I've also gone around and cleaned most of the grounds, there's a few inside the cabin that I haven't gotten to yet, as well as the main ground by the battery.
I'm not new to wrenching at all, but I am new to Pontiacs, I've always worked on Fords, so this is a new field to me. I don't mind spending the money on a new PCM, but I want to make sure it is the problem before I do. Does anyone have any feed back on input on these 2 issues?
Thanks for any and all help you guys can provide.
Edit: The PO (genius BTW...) had a wire leading from the cruise (brown wire) to the e-Fans (Grey Wire). That has since been removed...not sure why he did that.
Edit 2: I read online that if you unplug the ECT the PCM should not only throw a code, but also have the fans on all the time. I unplugged it and nothing changed, no SES and no fans. Does this mean my problem revolves around the ECT? When the A\C is turned on is the ECT bypassed (when it comes to the e-fans)? My temp gauge works fine; I know there are 2 sensors inside the ECT, one for the PCM and one for the gauge.
