I am having an issue with a 1993 Buick Regal 3.8L engine. Only on cold days (below 30) at first start-up it will continue to idle too high after an initial warm up period (a few minutes). This happens about once every 3 or 4 days. And if I "kick" the gas pedal it will idle even faster sometimes. I have to shut it down, and re-start and it will always idle fine. The TPS (throttle position sensor), the IAC (idle air control), and PCV valve have all been replaced. It has been scoped 2 times (no codes). No vacuum leaks have been found. The throttle body has been cleaned. I love the car (mint condition) with 108,000 miles. At first I was frustrated. Now I am MAD! Can anyone please help? THANKS in advance!
P.S. The TPS has only 5000 miles on it. I didn't notice a problem until it got cold this October (06). The TPS was replaced in February (but the car was stored and not driven until May). A mechanic on another web site mentioned the ohm setting on the TPS might not be correct. Any other opinions would be greatly appreciated.
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Saturday, January 13th, 2007 AT 9:40 PM
