car idling up by itself

sonic281 · Nov 27, 2011

So when im drivin slow through my apt complex in 1st gear the car will idle up by itself and when i push in the clutch it will go up to about 2 grand then idle down then back to about 1500. does the same at stop lights its very annoying any idea what this could be? Other than that the car runs fine.

Three50won · Nov 27, 2011

sonic281...IAC maybe? Dirty MAF?

GDawg · Nov 27, 2011

Three50won said:
sonic281...IAC maybe? Dirty MAF?

That and check for vacuum leaks.

wmburns · Nov 27, 2011

+1 on above. Start first by changing the PVC value. Check all vacuum hoses for leaks or rot.

Check the throttle linkage for binding. Check the throttle return spring.

Check the TPS.

For more information:
Is your mustang stumbling, dieing at idle or idling rough? - Page 14 - Ford Mustang Forums

sonic281 · Nov 27, 2011

cleaned the maf this morning havent driven it yet tho

twogts4us · Nov 27, 2011

Likely the IAC.

sonic281 · Nov 28, 2011

Do you have to replace the iac? Or can it be cleaned. cleaning the maf didnt fix the problem so thats out

Three50won · Nov 28, 2011

sonic281...try spraying it with some cleaner. Sometimes a little gunk and grime gets in there and keeps it open. Cleaning it may help...if not then try replacing it (provided you tried all the other posted suggestions).

sonic281 · Nov 29, 2011

ok I will try cleaning it tomorrow

djdizzydave · Nov 29, 2011

i had an idling problem 2 weeks ago.. course mine is an automatic and i changed out the Throttle position sensor and haven't had an issue since. hope you get it figured out, i know its annoying as hell.

sonic281 · Nov 29, 2011

djdizzydave said:
i had an idling problem 2 weeks ago.. course mine is an automatic and i changed out the Throttle position sensor and haven't had an issue since. hope you get it figured out, i know its annoying as hell.

Yeah its very annoying Im sure ill figure it out today

sonic281 · Dec 1, 2011

Three50won said:
sonic281...try spraying it with some cleaner. Sometimes a little gunk and grime gets in there and keeps it open. Cleaning it may help...if not then try replacing it (provided you tried all the other posted suggestions).

The iac is on the front of the plenum with the plug on top correct? IF so I took it off sprayed it out and put it back on. Seems to idle down quicker now. I also found that the hose that goes from the driver valve cover to the cai has electrical tape on each end from previous owner will that affect anything?

joshjwc9 · Dec 1, 2011

Yea, it gets gunk in it. Be careful though. By spraying too much cleaner in there may ruin the valve system inside of it. I found out the hard way..

sonic281 · Dec 2, 2011

joshjwc9 said:
Yea, it gets gunk in it. Be careful though. By spraying too much cleaner in there may ruin the valve system inside of it. I found out the hard way..

Well I cleaned it and drove it. a lot better but still idling kinda funny ill just have to replace it.

car idling up by itself

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