Nissan OEM Air Regulator - Nissan 300ZX Z32
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The air regulator provides and air by-pass when the engine is cold for a fast idle during warm-up. A bimetal, heater and rotary shutter are built into the air regulator. When the bimetal temperature is low, the air by-pass port opens. As the engine starts and electric current flows through a heater, the bimetal begins to turn the shutter to close the by-pass port. The air passage remains closed until the engine stops and the bimetal temperature drops. Sometimes these ports remain stuck open or closed, and causes inaccurate idle.
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