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?
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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