91 Accord EX Having a idling problem When in gear no problem ...Put it in Park and or Neutral the car
will raise in idle to 1800 rpm then peak and cut down to idle at 750...repeatn
Never when its cold..Only after it warms up. Have check IAC valve No luck... ??? any solutions

 

You say you checked the IACV, but did you remove it and blow it out with carb cleaner? If not, that would be the first thing to do. Second thing is to make sure the ring in the FITV hasn't backed off. Remove the two screws that hold the cap on the FITV and screw the ring down. If neither of those fixes it you probably have a vacuum leak. You can check for a vacuum leak by spraying carb cleaner around the intake manifold to see if you can find a place where the engine RPM increases.

 

Fast thermo idle valve ... check it out and see if it's sticking.

 

Thxs ...havent had time to checkout the FITV yet been layed up with bad back
Will get to it soon....Have checked vacuum lines All Good, Cleaned and Check IACV even swopped
out with a back up that I have..Soooo next will be FITV, Am thinkn I could have a bad ECM? recieving
bad info from the mapsensor, FITV, IACV, Fast Idle Control valve, Coolant sensor etc, etc,