Computer?? Again?!?!
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Mountain Pass
Joined: Sep 2010
Posts: 237
Likes: 1
From: Wyoming
Computer?? Again?!?!
Just got a new PCM for my 99 F350 everything has been fine and dandy until today. Let it warm up for about 15 minutes, it was plugeed in, since it is -5 here today. Got a few blocks down the road and the truck shut off out of nowhere. Won't start acts like the computer is froze up. This exact thing happens if I'm programming the truck with my edge chip and it unplugs. When this happens I call them and they send me a stock writer however, this time they say it cant be the chip since I was driving and they cant help me basically. Any suggestions? Or another new PCM? Thanks!
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 237
Likes: 1
From: Wyoming
No wait to start light. That's what's got me leanin toward some kind of electrical problem.
Cargo Master
Joined: Mar 2006
Posts: 2,502
Likes: 2
From: Bend Oregon
Do you have power to the PCM? Do you still have a fuel bowl heater and is it hooked up?
If you still have a fuel bowl heater and it is hooked up check fuse 30 in the iin cab fuse box. If it is blown unplug the fuel bowl heater on the back of the fuse box and replace the fuse.
https://www.ford-trucks.com/forums/1...wts-light.html
If you still have a fuel bowl heater and it is hooked up check fuse 30 in the iin cab fuse box. If it is blown unplug the fuel bowl heater on the back of the fuse box and replace the fuse.
https://www.ford-trucks.com/forums/1...wts-light.html
Last edited by clem1226; Dec 4, 2013 at 12:37 PM. Reason: added link
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 237
Likes: 1
From: Wyoming
My chip comes on and says no communication to with the pcm and gives an error. Not sure if I still have power to it or anything. I'm at work now had to tow it back to the house and leave the tests for tonight. If I Do anything tonight being that its only getting windier and colder right now. I will start with checking power to the pcm though
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Mountain Pass
Joined: Sep 2010
Posts: 237
Likes: 1
From: Wyoming
I will dediny start there! That would be awesome!
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Given the extreme cold, it could also be a "sticky" PCM power relay. Under-hood box (I believe for a '99):
It's the top one in the row on the right.
Also, the IDM relay is the third one down.
The washer pump relay is the fourth one down, so use it to swap into the other positions to test.
Pop
It's the top one in the row on the right.
Also, the IDM relay is the third one down.
The washer pump relay is the fourth one down, so use it to swap into the other positions to test.
Pop
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Lead Driver
Joined: Jul 2003
Posts: 7,406
Likes: 52
From: Wheatland, Mo
The fuse for the fuel bowl heater/PCM is the bottom one, second column from the right, on the under-dash fuse box. 30 amp fuse. I believe the ONLY 30 amp fuse in there. If it is blown, unplug the fuel bowl heater (White plug at the back/bottom of the fuel bowl), then replace the fuse and try again.
Thread Starter
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Mountain Pass
Joined: Sep 2010
Posts: 237
Likes: 1
From: Wyoming
The fuse for the fuel bowl heater/PCM is the bottom one, second column from the right, on the under-dash fuse box. 30 amp fuse. I believe the ONLY 30 amp fuse in there. If it is blown, unplug the fuel bowl heater (White plug at the back/bottom of the fuel bowl), then replace the fuse and try again.
Lead Driver
Joined: Jul 2003
Posts: 7,406
Likes: 52
From: Wheatland, Mo
Good to hear it is back up and running again.
I did mine during rush hour in the middle lane of a 5 lane highway. YIPPIE!!!
At least it doesn't take much to do it. Now you can work on getting a new heating element.
I did mine during rush hour in the middle lane of a 5 lane highway. YIPPIE!!!
At least it doesn't take much to do it. Now you can work on getting a new heating element.
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