Car runs well except for idle during warmup. I come to a stop, rpm about 850, then after a few seconds, drops to 500. The vacuum drops from 18" to 12" and runs rough and may stall. There are no error codes and the timing and hot idle is set correctly with green 1 pin connector grounded. Slight throttle feed will smooth out idle with rpm at 850. I have tested egr, pcv, purge control 1, 2. It acts like a vacuum leak, but. The Throttle sensor idle to ground is 60 ohms, the gap is set correctly, the prc and tics solenoids work. Any clues? Isc valve? Water thermo sensor or switch? The car does warm up slowly. Can ICS valve be cleaned?
Friday, December 30th, 2011 AT 5:54 PM