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Idling high out of nowhere

  • Thread starter Thread starter BlueChappy570
  • Start date Start date May 19, 2021
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    1994 convertible help me idle
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BlueChappy570

New Member
Jul 22, 2020
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Port St. Lucie
May 19, 2021
#1
  • May 19, 2021
  • #1
Please help! I have a ‘94 V6. Driving yesterday, it started idling at 15 to 1600 RPMs. Had to stand on the brakes hard at traffic lights just to keep it still. Even got to the point where the temperature got extremely high. I know there are other topics on the same thing, but I am so lost with all the different possibilities. It is not bouncing but staying steady at a higher RPM. This wasn’t happening two days ago. Can anyone help me?
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
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polk county florida
May 19, 2021
#2
  • May 19, 2021
  • #2
Start by checking for vacuum leaks
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
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Kearney, NE
May 19, 2021
#3
  • May 19, 2021
  • #3
On my 91 5.0 with all clear codes, a suggested hanging idle fix is cleaning the tps connectors. I will also be testing it with a meter. I figure the computer system is not so different in your V-6.
The high temp thing may be a clue. Have you run codes?
 

Chythar

Recently finished repairing my rear
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May 20, 2021
#4
  • May 20, 2021
  • #4
I had that exact thing happen on my old 94 V6. Turns out the idle air controller (IAC) malfunctioned and kept letting in air while the engine was running. Try unplugging it and see if that makes any difference. If you're not sure what the IAC looks like or where it is, search for "iac 94 mustang 3.8" on google, and click the Images tab.
 
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