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RPMs fluctuate up & down at idle on startup

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RPMs fluctuate up & down at idle on startup

Old 12-14-2011, 12:32 PM
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Join Date: Sep 2007
Location: Aurora, IL
Posts: 95
Question RPMs fluctuate up & down at idle on startup

When I start the car, not just cold days, but even in the hottest days of the summer, my RPMs fluctuate up and down when idleing.

What do you think the problem is?
Old 12-14-2011, 12:34 PM
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Join Date: Aug 2007
Location: DUB Caeser
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Only when the car is started? How about after the car is warm? Does the idle surge still?
Old 12-22-2011, 01:09 PM
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Join Date: Dec 2011
Posts: 1

Ive had this prolblem for a few months and fixed it about 20 minutes ago. I tried a new map sensor, new throttle position sensor, and tried reprogramming the idle by pulling the ecu fuse ect... I cleaned the IACV but nothing worked untill...... On the IACVthere is an electrice magnetic thing where the wire harness plugs into the IACV, I took that off and the metal round cylinder looking thing was stuck, I grabbed it with two fingers and twisted it till it would turn about a half turn in each direction, in one direction I could feel the resistance of a spring which is on the opposite side of the IACV held on with two screws. Once I loosed it up by twisting it about a dozen times I put the white plastic electrical piece back on it and it idled at about 2000 then went down and held stead at 1000. before it would idle around 2000 then it would warm up and rev from 1000 to 2000 repeatedly like a yo yo. you hear be babe?
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