Engine Performance problem
1994 Buick Regal 6 cyl Front Wheel Drive Automatic 100K+ miles
My 3.8L has been fully rebuilt. It has performed flawlessly for 25000 miles. Last trip it began to idle high intermitantly. It does it cold or hot. The PCM throws no codes even while it is hapenning. A restart sends the idle speed and IAC counts back to normal. The PCM has been replaced (again) and the IAC has been replaced (again). The interconnecting wiring and circuitry verified from both ends of the circuit. There are no vacuum leaks. Any significant load at idle( ie:shift to drive, a/c request) ratchets up the IAC count and the idle speed, but removal of the load does not drop the count or RPM. Every subsequent load application raises the indicated count and rpm (shown on the scan tool )until it gets too high to safely shift into gear. A restart of the engine brings the count and rpm down to normal. This event doesn't always happen, but is getting noticably worse.I posed this problem to your online "competition" but got only generic answers that didn't help. Any idea?
have the same problem?
Friday, September 25th, 2009 AT 6:19 PM