2001 Mercury cougar rpm's racing in idle, dying at a stop. Already replaced the air control valve. What is it now?

Asked by Jan 13, 2017 at 12:24 PM about the 2001 Mercury Cougar 2 Dr V6 Hatchback

Question type: Maintenance & Repair

My sons mercury cougar was racing in idle, rpm's would go up. We were  told
to replace the idle air control valve, which we did. It is still doing it and
sometimes at a stop it will die, it didn't seem to help. What is causing it now?

5 Answers


Look for a vacuum leak.


when you changed the idel air control, you should unhook battery for 10 min, then hook it back up so computer can relearn idle.


Did you clean the throttle body when you replaced the IAC? Did you disconnect the battery for a few min after part was replaced?

1 of 1 people found this helpful.

Thanks guys, tried all but it ended up being the idle sensor, which has simalar symptoms. Anther $40-$50 part, easy to replace. Cars running great.

Lilybug what idle sensor did you replace?

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