Strange Problem
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New User
Joined: Mar 2008
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Strange Problem
My 2002 reg cab f150 has been havei some strange reving problems at idle and in drive.
In idle the engune revs extremly high, once put into drive or revese it lurches sharply, recently causing a u-jont failure, and when you apply the brake it acts like its going to die then revs back up sharply, but has no problems while on the throttle or crusing.
Does anyone have an idea? or a soution?
THX
In idle the engune revs extremly high, once put into drive or revese it lurches sharply, recently causing a u-jont failure, and when you apply the brake it acts like its going to die then revs back up sharply, but has no problems while on the throttle or crusing.
Does anyone have an idea? or a soution?
THX
Freshman User
Joined: Dec 2002
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From: SE Michigan
Originally Posted by Ninjadad
Does anyone have an idea? or a soution?
THX
Mine acted opposite to yours though...low idle cold (had to hold foot down to cold start on below zero mornings), so my diagnosis may not be correct. But for $6 and a half hour of work, its worth a try.
Could also be a vacuum leak too I suppose, is it throwing any codes?
Freshman User
Joined: Dec 2002
Posts: 38
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From: SE Michigan
Originally Posted by Ninjadad
no codes i have already ran those but ill give it a try thx alot
New User
Joined: Nov 2006
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Originally Posted by 8mmag
I'd guess the IAC is dirty. I just cleaned mine using Deep Creep (a Seafoam product) recommended on another site and mine is acting like new again.
Mine acted opposite to yours though...low idle cold (had to hold foot down to cold start on below zero mornings), so my diagnosis may not be correct. But for $6 and a half hour of work, its worth a try.
Could also be a vacuum leak too I suppose, is it throwing any codes?
Mine acted opposite to yours though...low idle cold (had to hold foot down to cold start on below zero mornings), so my diagnosis may not be correct. But for $6 and a half hour of work, its worth a try.
Could also be a vacuum leak too I suppose, is it throwing any codes?
I've had this happen to my '97 F150 4.6 on occasion.
Senior User
Joined: Mar 2003
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From: Canyon Lake Texas
Originally Posted by Sweet Christine
What is this "Deep Creep"? Where do you get and how do you apply it?
I've had this happen to my '97 F150 4.6 on occasion.
I've had this happen to my '97 F150 4.6 on occasion.
Freshman User
Joined: Dec 2002
Posts: 38
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From: SE Michigan
I got mine at AutoZone. You take the IAC off (2 bolts & a wire connection) and spray the daylights out of the inside of it. You may want a tiny brush of some kind to loosen up the carbon too. Put 'er back on and PRESTO, searching idle problem fixed.
I've heard cleaning them only works a little while, and while I can't attest to the long term effectiveness, mine has been working great for 2 months now, and I didn't feel like I did the absolute best cleaning job on it. I guess we'll see...
I've heard cleaning them only works a little while, and while I can't attest to the long term effectiveness, mine has been working great for 2 months now, and I didn't feel like I did the absolute best cleaning job on it. I guess we'll see...
