5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Throttle problem

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Old 11-03-2007, 07:21 PM
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89GT351
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Default Throttle problem


Hi, I have a 89 mustang with 351W 5-speed. I have a weird problem the car would start and drive great in the morning, but once I get it warm I get this weird throttle problem in neutral I give it a little gas to like 2000rmp and release the gas paddle and the engine stays at 2000rmp like the butterfly in throttle body got stuck? This also happens when I come to a stop and what ever engine speed the car was when I took it off gear it stays that way. This started happing about a week ago and it would do it randomly but now it does it all the time. I installed all this hoping it would fix the problem - new TPS, idle motor, 76mm C&L air sensor, timing is set at 12 degrees, picture below is the picture of that engine a lot of new parts. can’t find any vacuum leaks I thought it was a bad gasket or something. Can any one help me? Any help would be appreciated.
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Old 11-03-2007, 07:25 PM
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Default RE: Throttle problem

sorry, having problem with the pic.

[IMG]local://upfiles/61614/454C3BA6B5D444C2812934C144072361.jpg[/IMG]
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Old 11-03-2007, 08:00 PM
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Default RE: Throttle problem

iac(idle air controler) for about 149$ that fixed my idling problem
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Old 11-03-2007, 08:15 PM
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Default RE: Throttle problem

I already replaced it did not help.
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Old 11-04-2007, 12:26 PM
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Default RE: Throttle problem

anyone else have any idea?
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