idle goes up and down

Asked by backyardmechanic64 Sep 13, 2013 at 02:42 PM about the 2001 Ford Escort

Question type: Maintenance & Repair

when stopped with heater on is this normal  2001 ford escort

4 Answers
125

acmech52 answered 11 years ago

dirty or faulty idle air control valve cold idle. dirty or faulty egr valve when warm.

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diyfixer answered 11 years ago

If it is a ZX2 it doesn't have an egr, the timing belt could have slipped a tooth or a vacuum leak can cause this. I've even seen a bad battery / alternator cause it when it was undervoltage. Put a voltmeter on it and see if it is at least 13.5 volts to rule that out at idle.

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diyfixer answered 11 years ago

The blade on the backside of the throttle body can cause this as well as others have mentioned the IAC usually gets carboned up.

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