1995 Mustang GT Idle Problems

LOLALAMOUR

MEMBER
1995 FORD MUSTANG

My 'Tang has been acting up. When I drove from Sea level to above 6000 feet, the engine idle was above 2000 RPM. At speed, the car would not decellerate. Or, it would decellerate slowly. After shutting off the engine for a short time, the idle returned to normal. Back at Sea level, the same thing happened again. The Computer stored these trouble codes.122 and 124. Both relating to TP sensor. The TP checked out fine, but the IAC did'nt. In fact, the engine ran better when the IAC was disconnected. Replaced IAC. Engine Ran perfect. For a short time, and now I have the same problem. Help!

3 Replies

LOLALAMOUR

MEMBER
2 POSTS

Yes. I pulled the code(s) again. This time, Code 122 shoewed up...related to TPS. The only modifications to the engine/exhaust are a MAC cold air induction kit, Mac Ceramic Chrome Coated Headers, Flowmaster Mufflers, Taylor 8mm plug wires, Blaster Coil.

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Thursday, May 10th, 2007 AT 11:20 AM

MUSTANG2005

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5 POSTS

+1 I would replace the TPS and write back if it does not work.

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Friday, May 11th, 2007 AT 10:26 AM

LOLALAMOUR

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2 POSTS

I replaced the TPS with a new one from Ford. I still have the same problems. I still have code 122 showing -"TP sensor circuit below minimum voltage". And now I cannot clear the code from the computers memory. Additionally, the Check Engine light remains on when driving. Idle is still a problem. Too high, especially after starting the engine when warm. Also, between shifts, RPM drops abruptly. Not smothly as it once did.
There is also a problem when attempting the KOER test. My code reader says that the vehicle is not responding. I checked my code reader to make sure it was confugured properly and tried again. I was able to get codes 122 and 998 -("Hard Fault Present"), before my code reader could no longer function due to the "Vehicle not Responding" prompt.
Short of taking the car to the dealer, I am completely stumped by the cars problems. HELP!

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Tuesday, May 15th, 2007 AT 7:55 PM