auxiliary air regulator

[ORFORD2004]

When we start the car, the regulator receive voltage. Is that voltage stay ON all the time or something turn it OFF when the engine is hot?

John

[vandor]

On all the time.

[RRoller123]

I had been wondering about this myself. So the voltage heats the little beast and opens the slide a little? Or maybe the voltage starts to slowly close it while the engine is warming up? This thing has always confused me. I wish someone could explain it clearly.

[wikkid]

The AAV is located on the passenger side head cover. It has a standard Bosch electrical connector and a hose connecting to it at each end. It is simple in theory. It has a bimetalic strip inside that expands and contracts when it gets hot or cold. When cold it contracts and opens up a passage inside the AAV which allows more air to pass through it and and into the intake plenum. This causes the AFM to increase injector duration and it increases the idle speed. As the car warms up the AAV's passage closes slowing down the idle. I should note that the idle speed should never really changes much during warm up. The engine will idle at a higher speed as it warms up with a given amount of airflow so what the AAV is actually doing is providing extra air when cold and then cutting off the extra airflow as it warms up to keep the idle about the same. The electrical connection has nothing to do with any other system. It is simply provides electrical current to the AAV to cause it to warm up and close a little faster then it otherwise would.

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[RRoller123]

Got it, thanks. So the electrical impulse just helps warm it up a little faster, thus being on all the time makes no difference, since once it is warmed up, it is and stays closed.