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Originally Posted by JFAZ
I have removed the idle control valve and cleaned thoroughly. I have also disconnected the wires going to the ICV- no change in idle....When i pull back the plug on the ICV and measure (with the plug still partially connected) it reads about 4v.
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Ok, this should tell you that the engine is able to get air to idle high without using the idle air valve. If the ECU is supplying voltage to the valve, it is unaware of the air flow you have. I.e., the airflow meter is NOT metering the air now flowing to your intake ports. Only one way this is possible - an air leak bypassing the throttle. If you have verified the throttle is fully closed, then you have an air/vacuum leak. Nothing else will do it.
Steve