Engine Performance problem
1993 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic 115000 miles
Hello all. I have a 93 Grand AM with a 3.3 litre with a high idle. (2000-3000 RPM's hot or cold). I replaced the IAC with a known good one, cleaned the throttle body, the MAF, and the IAC passages in the throttle body and still have the same high idle. Checked for vacuum leaks with carb cleaner with none found. I have an OTC scan tool and have scanned some data and what seems weird is that the IAC counts stay at 110-120 whether in park or in gear at 1300 RPM's. I've heard the IAC counts should be down around 20-30 or so. The TPS scans ok between.27 and 4.0 from idle to wide open throttle. O2 sensor is switching back and forth OK too. I just got this car and have no troubleshooting or wiring diagrams. I'm thinking maybe some wiring issues between the IAC and PCM? I'm at a loss on this one! Any ideas?
have the same problem?
Saturday, October 25th, 2008 AT 9:22 PM