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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

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Old Sep 22, 2011 | 09:57 AM
  #1  
packratF350's Avatar
packratF350
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Hey All!

Its been since 2006 that I last logged in here! Thats when I blew up my last F350, a CrewCab Centurion dually I still miss that truck!

Well, now I have another F350, much smaller than the last, but maybe a better truck (that remains to be seen, tho!).
This one is slated to be a work truck, apparently it used to be a Moving Company truck (at least from the faded letters in the paint...).
Its in the exhaust shop right now for an exhaust leak. Then back to work!

My trouble is that I can't get the idle to come down from roughly 1000 RPMs.
I'm not sure where to be looking, other then the normal tune-up items I started on yesterday (cap, rotor, and new plugs). I'm not much of a fuel injection guy, so pointers are welcome.

The truck in question is a '94 F-350 single cab, 5.8L, 5 speed (is this a ZF5?), with a dually rear axle.
 
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Old Sep 22, 2011 | 10:08 AM
  #2  
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Did you retard the timing on the distributor a little bit?
 
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Old Sep 22, 2011 | 11:11 AM
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Also check to make sure the idle screw on the throttle body wasnt turned up.
 
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Old Sep 22, 2011 | 11:39 AM
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I played with the timing a little, it doesn't seem to do any good.
Edgethis, I actually grabbed a screwdriver from the guy I bought it from and tried to back it off before I had decided to buy the truck...no dice on bringing it down...
 
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Old Sep 22, 2011 | 11:52 AM
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You might try and take the TB off and clean it with a strong TB cleaner and brush. Might have build up that doesnt let the butterflies close.
 
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Old Sep 22, 2011 | 01:38 PM
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I'll try that as soon as I get the truck back and have time to mess with it. All my tools are two hours away right now in my shop.
I did spray the TB down with cleaner when I first got it, It didn't look too bad in there. There is a solenoid or something on the driver's side of the TB that looks to have been recently replaced. What is that, and would it affect the idle?
 
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Old Sep 22, 2011 | 01:57 PM
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That should be the Idle air controller i believe.
 
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