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The mkiv Supra Owners Club

Erratic Idle (due to air con?)


cheekymonkey

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I've had erratic idling in the past with this car but usually a tap of the throttle pedal sorts it out. Tonight however it seems a lot worse, both when the engine is cold and warm.

 

Today I found that turning the A/C off seems to solve the issue, the car idles normally at around 900 rpm. As soon as I switch the a/c back on again and tap the throttle, I get an erratic hunting from 1000 rpm or so almost down the stall. Turning A/C off again returns to a normal idle.

 

This leads me to suspect something more than a dirty IACV (which I've cleaned in the past). Anyone got any ideas?

 

Running PowerFC rather than standard ECU if it makes a difference.

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