I have a 1995 Buick Century with the 3.1 V6 engine. One morning I started it and the engine was racing over 2000 rpms (estimate), I could idle at over 50 mph (It makes all the shifts) I turned the car off and on a few times with no change. I noticed a crack in the pcv tubing to the pcv valve, I taped that up and the idle went down considerably but still way too high now I idle at 15-25 mph. I replaced the IAC valve and cleaned the whole throttle body. I tested for vacuum leaks by spraying braking cleaner and found nothing. I plugged in the IAC and watched the piston move when I turned on the ignition before I put it in. But she is still idling way too high. If I unplug the IAC while it is running it makes no difference in idle speed.
Thanks in advance for any suggestions!
Wednesday, March 9th, 2011 AT 3:52 PM