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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Idling really high

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Old Mar 28, 2006 | 11:30 AM
  #1  
RAH4X4's Avatar
RAH4X4
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Cross-Country
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From: Robbinsdale
Idling really high

I have a 1989 F-150 XLT 4x4 and it runs really good when it starts up and warms up but as soon as I put it in gear and start driving it it idles at around 2000 rpm. It's not a big problem. I've gotten used to it. The only thing is when I come off the brake it wants to go fast but I just slowly come off the brake and it's fine. I'm selling it though because I just bought another truck and don't need this one. In order to sell it though I don't want perspective buyers to think there's something major wrong with it when they test drive it. Has anybody else had this problem with theirs? I've looked at the throttle body but can't figure out how to turn down the idle. I'm sure it's all computerized. It's a 5.0 EFI by the way.
 
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Old Mar 28, 2006 | 12:24 PM
  #2  
MemOrex's Avatar
MemOrex
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From: B/CS, Texas!!
Two things to check:
-Vacuum Leaks.
-Throttle Position Sensor.

Usually, its the TPS gone bad that causes that.
 
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Old Mar 28, 2006 | 04:32 PM
  #3  
RAH4X4's Avatar
RAH4X4
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From: Robbinsdale
Thanks alot. I'll check those items out.
 
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Old Mar 28, 2006 | 05:34 PM
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whiteyfordzx5
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IAC Valve may be the culprit as well. High idle is a telltale sign. You can try taking it off and cleaning it out. It's common for these to start sticking.

Mike
 
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