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S.O.S. air control valve 200

posted by  B.C. on  Mon Apr 30 03:42 CST 2007
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last visit: Wed Mar 28 22:28 CST 2012
[RELATED]

Tnoy H. has it - connect the hoses from the IAC like he says to. That way, you see, the IAC does its job.

Without the IAC, when the throttle plate closes the engine would get no air, and die. The IAC, which goes into action when the throttle position switch signals to the ECU that the plate is closed, allows controlled air into the engine. The ECU controls the IAC to allow enough air to keep the idle speed around 750-800 rpm.

So the hoses from the IAC must bypass the throttle body. Make sense?

While you are in there, inspect the air intake accordion hose. I have found on several 240s that the bottom side of it gets little holes in it that are impossible (for me) to see without taking the hose off the car.

A hole there will allow unmetered air into the engine. Seen by the 02 sensor as running lean, the ECU will add fuel. Whack! on the gas mileage.

If you find a hole, some black vinyl electrical tape will do as a short term patch. Gives you time to order and install a new one.

Good Luck,

Bob

:>)





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