1994 Ford GT Mustang Cold mornings engine idle problems

Tiny
EDJENKINS
  • MEMBER
  • 1994 FORD MUSTANG
  • V8
  • 2WD
  • AUTOMATIC
  • 15,000 MILES
On cold mornings after starting the car, the 302 engine runs smooth for about 30 seconds and then it starts surging up to about 2000 rpms and drops to 500 rpms. This goes on until the engine stops running. Some cold mornings the engine will run fine for 30 seconds or so then just stop like someone cut the ignition off. On the 2 situations it this does not occur everytime. During these occurances, if I start the engine and stay with the car keeping the rpms about 2000 for 30 seconds or so, engines runs fine. This only happens when engine is cold. The idle sensor and throttle position sensor has already been replaced and did not solve the problem. Also another problem has started occurring. Now when it is warm and changing gears, the engine will idle up and sitting at intersections the engine cuts off unless you keep the rpms up.
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Monday, January 4th, 2010 AT 12:25 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Two things. Have you checked for vacuum leaks? Also, have you checked the temp sensor?
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Thursday, January 28th, 2010 AT 11:04 PM
Tiny
EDJENKINS
  • MEMBER
Thanks for the suggestion on the temp sensor. That solved the issue. Also found a bad new part the throttle sensor was also bad too.
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Monday, March 1st, 2010 AT 9:35 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm glad it worked and things are back to normal for you. Let us know if you have questions in the future. Also, thanks for using 2carpros. Com.

Take care,

Joe
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Monday, March 1st, 2010 AT 1:23 PM

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