Thread: 2000 GTP Running Rich

I have a P0172 code and the car runs really rich.

The following has been tested and I believe is not the problem.

MAF sensor - replaced
FPR - replaced
Plugs/wires - replaced
Throttle body - cleaned
Tstat - replaced
Injector o-rings - replaced

Other tests that have come back clean:

O2 sensors operating properly
Checked back-pressure for clogged cat
Fuel Pressure okay

Injectors seem to be injecting more fuel than what seems normal. Is this just due to the fact that it is supercharged? Or could that be the problem. The reliable mechanic that did the test for me said he is not 100% sure if this is just because of the supercharger so I thought I would ask you guys. He said it was slightly more than normal and seemed a bit inconsistent.

Any other possibilities would be greatly appreciated!!!

Other symptoms:

Worse when it is hot. Upon hot restart the rpms surge really bad.
Seems like when you are coasting (like down a long hill) the rpms surge especially when you hit bumps and once in a while the car will die all together.

Check your ECT (engine coolant temperature sensor), and make sure that it is giving accurate information to the ECM/PCM. If this is malfunctioning, it will make the engine run richer than normal, or leaner than normal depending on the malfunction of the sensor.

The scanner showed a good reading from the ECT as far as I could tell. It slowly warmed up as the car warmed up, and eventually leveled out between 88-90 degrees. Is this number normal? Anything else I should check? Any other advice would be great! Thanks!!

Okay let me know what happens because I have thrown too many parts at this thing. Thanks!!

I think at some point during all of this I have, but I'm willing to try anything again to figure this out. I'll let you know how it goes.