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RPM surge w/AC at idle


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maggie
New User

Jul 5, 2008, 5:07 PM

Post #1 of 4 (1597 views)
RPM surge w/AC at idle Sign In

2005 Mercury Montego Premiere - RPM surge at idle with A/C on. Any help?


way2old
Veteran / Moderator
way2old profile image

Jul 5, 2008, 6:48 PM

Post #2 of 4 (1595 views)
Re: RPM surge w/AC at idle Sign In

Either the Idle speed control os not working properly or the a/c clutch is drawing too much current. Cleaning the ISC may help.



Being way2old is why I need help from younger minds


maggie
New User

Jul 5, 2008, 6:55 PM

Post #3 of 4 (1594 views)
Re: RPM surge w/AC at idle Sign In

It ONLY does it with the A/C on, so does that mean it is probably not the ISC?
Thanks


way2old
Veteran / Moderator
way2old profile image

Jul 5, 2008, 7:05 PM

Post #4 of 4 (1593 views)
Re: RPM surge w/AC at idle Sign In

Not necessarily. Does it do it at speed driving down the road? Or does it do it at idle? If it just does it at idle, look at the idle speed control. You can remove it and clean it with carburetor cleaner to see if it helps. Let us know.



Being way2old is why I need help from younger minds






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