If you shut the car off and restart it, does it idle normally again for a little bit?
And to be very clear, this happens with the car totally stopped? Otherwise, the rolling-idle strategy keeps the RPMs at about 1200-1400.
Question 2.. When idle goes high is it a steady high or a rolling idle. From cell phone i cant your info about ur car?
could be ur temp sending unit. could be telling it its cold so its giving it more fuel. which usually means difficulty starting when its cold. throtal positioning sensore too. also could be ur maf sensor (mass air flow) or ur map(mass air pressure) sensore depending on the year or set up on the car.
+1
I would check codes. An if you haven't done so check the useful tech treads, it is a sticky at the top of this forum. There is a Surging Idle check list that I would go through as many of the same things can cause a high idle. Or here is a direct link to it.
http://forums.stangnet.com/698148-help-me-create-surging-idle-checklist.html
The coolant temperature sending unit (not "sensor") is on the driver side of the intake manifold, and it's screwed directly into the manifold. (The ECT sensor is screwed into the heater core feed pipe which is then screwed into the manifold.) It has a single-wire lead that is pushed onto the stud coming out of the top if the sending unit.
http://www.allfordmustangs.com/foru...temperature-sensor-act-my-new-car-015-act.jpg
this sensor tells the computer the motor is cold. therefore acting like a choke it gives the motor more fuel to warm up faster and run right when u dont let it warm up properly. just like a carburated motor with a choke. usually when they go out its a reverse effect when its saying its hot its cold and when its cold its hot. seen it thousand of time especially on 80 model chevy. not saying that ur problem but may be. usually cleaning wont help.
after the car has sat over night, and the motor is cold is it hard to start in the morning? like does it turn over a few times befor it fires off or is it pretty short? and do u have to give it gas to keep it running till it is warm?
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