idle goes up and down

Asked by 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

114,245

Dirty or faulty idle air control valve. Clean or replace as needed

75

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

355

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.

355

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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