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The 280zx non turbo has the cold start valve to raise the idle when it start in the morning. Can anyone tell me what raise the idle on a 81 turbo in the morning?
 

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The AAC valve also contributes to idle speed. When the cyl temp sensor tells the ecu the engine is cold, the ecu sends a signal to the modulator which puts more vacuum to the aac valve, thus opening it and increasing idle speed.
Dan
 

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where abouts is the AAC valve?

got a bad idle and im trying to find the cause. ive replaced & cleaned the air regulator, didnt help much.

is the cold start valve a possible problem too?

Jeremy
 
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