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Posted on Jan 02, 2017
SOURCE: I have a 2002 Ford
The "IAC" is not a sensor. IAC stands for Idle Air Control - it is an electric solenoid. These are not supposed to be "cleaned". If someone cleaned it, that is most likely your problem. You will most likely have to replace the IAC and get the engine to idle correctly so it will not stall at stops. This is a common problem for Ford 3.0L engines even if the IAC has not been cleaned.
Posted on Apr 11, 2011
If you did not disconnect the battery and drain the voltage from the ECM, it could be using old settings when the problem existed.
When a problem occurs, the computer tries to correct it or find new settings to work around the problem. When you fix a problem you have to clear the codes and sometimes erase the memory from the computer to allow it to start back at the factory settings.
When you disconnect something and the check engine light comes on, the computer goes into limp mode and uses values for the sensors preset by the factory. The car will almost always run rich to ensure the driver can get back to a place for repairs.
Posted on Aug 25, 2012
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