1993 F-350 5.8 wont idle. - Ford Truck Enthusiasts Forums

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1993 F-350 5.8 wont idle.

 
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Old 11-13-2010, 07:53 PM
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1993 F-350 5.8 wont idle.

A friend of mine owns a 1993 F350 with the 351 motor. She lives 20 miles away and tells me her starter is cranking but not turning over the motor. I turns out the starter is turning over the motor, the motor isn't catching. I didn't have any diagnostic tools with me, just what I needed to change a starter. So before I drive all the way back up there, I thought I would throw this out there to see if anyone else has had this problem...

I hopped in the truck and turned the key, and it turns over but wont start. I can hear the fuel pump running on both tanks. I mashed the accelerator to the floor and it starts and revs up. As I bring the idle down it starts to stumble and dies at anything below 2000 rpm's. The truck was running fine when she hooked up her horse trailer and when she went out a few hours later to leave is when she started having problems. I swapped out the MAP sensor as well as the IAC valve with no change in performance. I went around and disconnected every other sensor one at a time to see if I got any changes, Nothing. No blown fuses, no check engine light, not chaffed wires from what I could see. The only change I got was when I disconnected the vacuum line to the MAP sensor I could bring the idle down to around 900-1000 rpms, and no black smoke was coming out of the tail pipe. What are the chances of a plugged fuel filter, or a bad FPR? Bad computer?!?!

Any help would be appreciated. I would like to try to get an idea of what is going on with this thing before I head back up the hill. Thanks, Chris.
 
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Old 11-18-2010, 07:21 PM
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EGR was stuck open. Thanks for everyones help.
 
 
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