Perhaps a vacuum leak, or clogged throttle body. Perhaps just a worn out engine. When you replaced your idle air control valve, did you remove the battery for at least 10 minutes? It will reset the computer, then start the car up with all the accessories on, let it idle for about 5 minutes. It should relearn how to idle. Perhaps that will help.
Minimum of 10 psi at idle when the engine is warm.Minimum of 10 psi at idle when the engine is warm.
my 96 dodge Dakota wont idle when engine is warm and i changed idle air controle valve what else could be wrong
it helps control your idling from cold to warm up and when decelerating.as far as the time it takes-depends on engine size-i believe its a little quicker on a 2.0
IAC - in other words idle air control valve
I am able to answer my "own" guestion, after taking my car in for repair at my local Ford Dealership. Ford first check to ensure fuel pressure is good and it was. They found a problem with idle air control valve. It sits right on top of the engine. It must be replaced can't be fixed or repaired.Ford part number cx-1854 (f68z-9f715-eb valve)
The IAC valve is on the back of the throttle body. It has 2 bolts on the back of it and a black cylinder on one end. The idle adjuster screw is on the front of the intake and has a couple cables running to it. Let your car fully warm up and turn the screw to adjust the idle.
Try changing your PCV valve it messes with the idle control. and shifting prob is likely in tranny and may not be related at all. try PCV valve and have your tranny serviced.
Sounds like your catalytic converter is getting plugged. The Rough idleing could also be apart of the IAC (Idle Air Control valve) being gunked up. Check the cats first, then if it continues to idle rough, take the IAC out and clean it with throttle body cleaner.
The idle speed control valve was bad.
Your Idle Air Control valve may be sticking. Or the engine oil is to cold, thickens there is more power needed to crank the engine.
Does it only occur when the engine is cold? There should be an idle valve with a vacuum hose i.e. BMW has a hose that comes from the intake manifold goes down into an electric valve then goes on to the throttle body intake hose. The timing is retarded to help start/idle the engine when it's cold if the hose came loose it will not advance the ignition when the engine is warm.