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Car idle goes up and down - 2003 Ford Taurus

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Take the idle air control valve off the throttle body and clean carbon out of it using a non chlorinated brake cleaner then reinstall and reset computer.

Posted on Apr 09, 2011

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Posted on Jan 02, 2017

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Toyota corolla hatch 2002 idle at 2000 rpm when


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Idle goes up and down when aircon is on


This is pretty much normal as the AC engages and disengages. Though it should be subtle and not erratic. Is it causing your engine to stall? Does your AC work efficiently or is the air not real cold. It should output around 40 degrees. The compressor may be going out or it needs oil. When the AC turns on the car idle sensor should raise the idle so the AC does not drag the idle down too far. If you turn AC off and try pounding on the brake & turning the wheel violently at the same time (in park of course) if you still have an erratic idle it's not the compressor. It will probably be the IAC or a vacuum leak is suspect.

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Start car and the idle goes to 3000 rpm, holds there for around 12 seconds or so and then comes down to around 1200. when driving if stopped and you put the car in park or nuetral the idle will go up to...


it sounds like a vacuum leak to me, my car had the same problem but when i changed the hose that connected the valve cover to the fuel injectors the rpms dropped back down to about 800 rpms

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if the car drives just fine at normal speeds, and only revs up and down at idle, i'd say idle air control module.

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Can't turn the idle down


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tepfy

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94 civic erratic idle when warm


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High fast idle at start up.


On most newer cars there is a fast idle motor controlled by the computer that will hold the fast idle till the engine reaches a preset temp in the computer then the engine should drop down to the set idle according to specs for that car. If the oil pressure continues to stay low after the idle goes down you may need to replace the oil pressure sending unit or if worse case the oil pump.

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