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High Idle when car has been running for a while (hot) 850 1995

posted by  HO on  Thu Jun 18 12:16 CST 2020
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last visit: Tue Aug 12 14:01 CST 2014
[RELATED]

This problem happened in around late April when we had the stay home advisory. When car is "cold" idle is fine, in park or waiting for traffic light. Once the car is driven for a while - "hot", idle speed goes up above 1300 rpm in Park position and a bit over 1000 rpm while waiting for traffic light.

Initially, I cleaned the IAC and the valve inside was moving freely when I shake the IAC. I also cleaned the throttle body too, not too much black deposit around the front and back side of the throttle body valve. Test drove the car after cleaning, same issue.

Then I got a new IAC from Volvo dealer and installed it. Still the same idle issue when car is "hot".

My car is 1995 NA wagon, what could be the problem here to cause the high idle in Park or waiting for traffic light ?

Thanks,

Ching-Ho Cheng
--
1995 855 NA, Bilstein Strut & Shocks, Volvo Protective Grill, E-Code Lens, Alpine CD-Changer, AutoDim RearView Mirror






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