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International Automotive Technicians Network
Re: 1990 Geo idle hunts
Posted to Technical Discussion Forum on 9/5/2000

Hi Tom,

This sounds just like the Honda system. A coolant heated fast idle control valve that when it goes bad, flows way too much air. When warm, the amount of air flowing is more than what the PCM expects to see with the TPS' idle contacts closed, thus thi... Login to read more.