Hello all, On my 92 Grand Caravan 3.3 I have a high idle problem that consistently trips the Code 25 (IAC circuitry). Idle at startup is around 1500 RPM's and moves steadily higher(1850+) as engine warms. Here is what I have checked and replaced. Idle Air Control Motor Cleaned throttle body and plate and replaced gasket. Swapped out Engine Control Module(ECM) from another Caravan(exact match). No known vacuum leaks or other gasket leaks No other codes found The code 25 immediately sets itself even after I disconnect the battery for an extended period. I even disconnected the ECM and reconnected. It will show the code before I ever start the vehicle again. It sets itself when key is in on position and checks signal voltage. I am suspecting wiring. Resistance tests appear normal. I would like to get this car past 300,000 (only 57 miles to go). It starts great and ran very well before this high idle issue. For those who know a ton more than me: What would be your next steps if you were in my shoes? Thanks
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18 years ago