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My 96 Thunderbird gradually idles up to about 2000 RPM's can u help?

Tiny
STARVINMARVIN
  • MEMBER
  • 1996 FORD THUNDERBIRD
  • 129,000 MILES
I have replaced nearly everything I know to replace. Changed idle control, temp control, tps, vacum canister, maf sensor, the oxygen sensor I coulnt get off but I pluged another one on it and laid it on the exhaust. The check engine light was on. It was the temp. Sensor and now no codes but still I start the car and it idles about 1200 then after a minute drops to 1000 then gradually idles up to about 2000-2500 rpm's. Other than the idle problem it runs great.I did replace most the parts with ones from junkyard.I wanna fix this car and give to my mother, please help
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Saturday, August 4th, 2012 AT 6:12 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you looked for a vacuum leak yet?
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Saturday, August 4th, 2012 AT 6:16 PM
Tiny
STARVINMARVIN
  • MEMBER
  • 5 POSTS
Ohh I forgot to say it is a 3.8 v6
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Saturday, August 4th, 2012 AT 6:17 PM
Tiny
STARVINMARVIN
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  • 5 POSTS
Yes ive checked everywhere and plugd off power brake booster sprayed carb cleaner all over and cant find any leaks
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Saturday, August 4th, 2012 AT 6:19 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
When the idle goes up have you tried covering the throttle body opening to see if it getting outside air other then the throttle body.
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Saturday, August 4th, 2012 AT 6:44 PM
Tiny
STARVINMARVIN
  • MEMBER
  • 5 POSTS
No I will but I covered the air pasage to the maf and it idles down and thanx
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Saturday, August 4th, 2012 AT 7:33 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Your welcome keep me posted.
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Saturday, August 4th, 2012 AT 7:39 PM
Tiny
STARVINMARVIN
  • MEMBER
  • 5 POSTS
After I got your last suggestion I realized I must have created a fuel leak when I replaced the fuel presure regulater. Im gonna take the top intake off to get to itproperly first. If it idles down when I block the throttle body this means I have a vacuum leak?
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Monday, August 6th, 2012 AT 2:12 PM

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