It's under the throttle body. To get to it, you'll need to remove the throttle body and flip it upside down. The IAC valve is mounted by two screws to the throttle body, and it has a gasket that you will need to replace if you remove the IAC valve, so make sure you have a new gasket on hand if you intend to take off the IAC valve.
where is the iac valve on a 99 honda civic lx?
Under the throttle body
The IAC valve is mounted on the upper intake plenum (manifold)
Sorry. Not familiar with an "iac" valve. Could you please spell it out completely without abbreviating it?
The IAC is located on the throttle body. Simply unplug the dirty IAC and clean or replace the IAC.
The Haynes Manual (copyrighted) gives no instructions for the cleaning of the IAC, only its replacement if defective.
its the iac valve or maf sensor
idle air control valve (iac) could be dirty or clogged.
check for a coolant leak. even a pin hole in a hose can cause something like that. cheapest way to start. if not, get an iac valve its probably the fit valve here's a link: http://www.superhonda.com/forum/f55/troubleshooting-idle-problems-259965/
More than likely the Idle Air Control (IAC) is defective.
where is the iac valve for 2003 expedtion Eddie Bauer
Where is the iac valve located on 2004 dodge 5.7hemi