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May 6th, 2007, 05:08 PM
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#1 | |
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Resident Bubblehead
2000 Mustang GT
Join Date: Nov 2006
Location: Haymarket, VA
Posts: 6,045
 iTrader: 2 reviews
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idle question
i've noticed that when i'm in normal stop and go traffic, my idle rpm is really erratic. it doesn't spike, but it does drop to about 500 rpm. the weird thing is, it only happens when i'm running the a/c or the heat. car's not throwing any codes, and i've cleaned the IAC a few times. i've checked for vacuum leaks and haven't found anything. ideas, anyone?
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 Submariners Do It Deeper Military Crew MM1 (SS)Order of the Bluenose US Navy Veteran
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May 6th, 2007, 05:46 PM
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#2 |
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Proud American
 
1996 Mustang GT
Join Date: Dec 2006
Location: Lakewood, CO
Posts: 10,689
 iTrader: 3 reviews
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My best guess is that the A/C is putting a strain on your engine. Mine actually revs higher when I have the A/C on or the Heat on! Maybe somebody else will pipe in!
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RIP Travis Billings  Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars |
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May 6th, 2007, 06:01 PM
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#3 | |
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Regular
Join Date: Jan 2007
Posts: 121
iTrader: 0 reviews
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Re: idle question
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May 8th, 2007, 02:12 PM
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#4 |
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Regular
Join Date: Mar 2007
Posts: 124
iTrader: 0 reviews
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my car does the same thing more so a sudden stop or after long driving.
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2000 black mustang GT W CAT BACK |
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May 8th, 2007, 02:52 PM
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#5 | |
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Enthusiast
Join Date: Mar 2007
Location: New Port, NC
Posts: 717
iTrader: 0 reviews
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Re: idle question
Its normal, just the engine bogging a little bit from the strain of the A/C pump. |
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May 8th, 2007, 03:36 PM
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#6 |
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Enthusiast
Join Date: Apr 2007
Location: Pearl Harbor, HI
Posts: 606
iTrader: 0 reviews
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Its completely normal.. your AC is going to put a strain on the engine.. so its going to pull down your rpms a bit at a stop. No worries.
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Work Hard....Play Harder. 
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May 8th, 2007, 04:14 PM
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#7 |
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Enthusiast
Join Date: Jan 2007
Location: Solomons, MD
Posts: 634
iTrader: 0 reviews
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+1 normal. mine does the same.
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"America is all about speed. Hot, nasty, bad ass speed." Eleanor Roosevelt, 1936 
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May 10th, 2007, 02:03 PM
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#8 | |
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Resident Bubblehead
2000 Mustang GT
Join Date: Nov 2006
Location: Haymarket, VA
Posts: 6,045
iTrader: 2 reviews
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well, got this one figured out, too. i found out (by browsing through the owner's manual of all things) that if the battery is disconnected, you're supposed to start it and let it run with everything off for a few minutes and then with the a/c on for a few minutes so the computer can "relearn" the proper idle. this turned out to be tied in to the problem i was having where the car wouldn't start. all this over a battery that was going tits up. it needed more time to build enough power to turn the started. old battery out, optima battery in, hopefully no more issues. the gremlin hath been slain.
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Submariners Do It Deeper Military Crew MM1 (SS)Order of the Bluenose US Navy Veteran
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