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What is the Iac? 200

posted by  someone claiming to be Rhys on  Thu Jan 29 19:06 CST 2004 [RELATED]

I don't have that green book Doug. The early K-jet auxiliary air valve, is a slide valve like you say, normally bolted to the edge of the cam cover. The wires are for a heater circuit. Conduction and the heater expand a bi-metal strip that closes the slide as the engine warms up. It is a cold fast idle device. The Idle Air Control valve is plumbed similarly into the intake tract, but it controls idle speed constantly through feedback. So it does the cold idle, and hot idle, and compensates for loads like AC and steering. It replaces the AAV and does more, so its wiring is from the computer, and is a true output device.






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