HIGH idle
Thread Starter
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Junior User
Joined: Feb 2008
Posts: 77
Likes: 0
From: Farmington, IL
HIGH idle
Ok well my freind has an 89 f250 5.0L camper special and as soon as it fires up, it goes strait to wide open. throtle cable is not stuck/sticking and we've replaced the idle air control motor and still not helping. ANY ideas???
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Sounds like the throttle butterfly has become detatched fron the spindle.
With engine off look down the throttle body and move the throttle cable lever and check that the butterfly moves from closed to open with the lever.
With engine off look down the throttle body and move the throttle cable lever and check that the butterfly moves from closed to open with the lever.
Fleet Mechanic
Joined: Feb 2009
Posts: 1,672
Likes: 20
From: Nixa
Does it stay at high rpms at all times, even when driving? If so it is most likely the plentium gasket gone bad. my 92 5.0, did the same thing and it turned out to be the gasket went bad. I cost around 400 to replace it at a shop.
Thread Starter
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Junior User
Joined: Feb 2008
Posts: 77
Likes: 0
From: Farmington, IL
ok well the butterflys are closed as they should be but its a 5 speed so i dont know about going down the road its kinda been parked since it started this problem. i does have a whistle to it when we let it run also. will check the gasket next.
