car idling up by itself

[sonic281]

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]

sonic281...IAC maybe? Dirty MAF?

 

[GDawg]

sonic281...IAC maybe? Dirty MAF?

That and check for vacuum leaks.

 

[wmburns]

+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]

cleaned the maf this morning havent driven it yet tho

 

[twogts4us]

Likely the IAC.

 

[sonic281]

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

 

[Three50won]

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]

ok I will try cleaning it tomorrow

 

[djdizzydave]

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]

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]

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]

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]

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.