I inherited a 1998 GTP 3800 Supercharged car with a host of problems. I've fixed most of them, but I have started replacing items that aren't fixing problems.
The temp gauge self-tests from 0 to max to 0 when I turn on the key, but the gauge never moves off 0 when the engine is running. I have an Actron scanner showing it running at normal temp. This model has a 3-pin (dual output sensor) which I replaced. At first I couldn't even get a reading on the scanner with the new sensor, but traced that to a bad connection in the connector. Now it's back where it was at 0 again.
I have multiple problems and believe they may all be related.
I was getting a p0102 MAF sensor error but traced it to fuse 21 in the underhood fuse panel. Replaced it, blew it and replaced it again. It seems to blow if I rev it above 3000 rpm, and then of course the rev limiter won't allow it to rev about 4000 RPM.
The transmission indicator on the instrument cluster only lights up park when it is in park or when it is in 3rd (stil lights up in park) , All other gears have no indicator light, nor are there any lights on the floor console indicating the gear it is in.
The oil level light comes on whenever the shifter is taken out of park, while the ign sw is on with the engine running or not. I replaced the oil level switch, cleaned the connector, to no avail.
Thus far I replaced the oil level switch, the temperature sensor, and even the instrument cluster, and have solved nothing.
I'm down to either having mouse-chewed wiring somewhere or possibly the PCM is bad. I at least avoided buying a $130 MAF sensor when I found the blown fuse, but I haven't found the cause of the blown fuse yet. Any and all help will be greatly appreciated.