1994 F250 Powerstroke Issues

[George_7.3IDI]

I've been trying to help a friend get his 1994 extended cab F250 running. So far we know that his truck turns over and will run on ether just fine of course with the glowplugs disconnected. Diagnostically his ignition is working because his chime works and starter works. But when his key is first turned the glowplugs do not energize... it's a brand new relay and the signal wire from the ignition to the glowplug relay has been confirmed as not getting power when the key is turned on. Also when we got the truck running on ether it didn't stay running. So I'm thinking there is some sort of electrical problem that is affecting the glow plugs and the injectors firing. At first we thought that maybe the ECU was shot so we replaced it with one off a good running powerstroke. That didn't solve the problem! So now after some additional reading in the "7.3 Bible" I am thinking that it might actually be the barometric pressure sensor. Whenever someone has the chance I'd like some feedback on whether you think this is the problem.

Thanks George

 

[94f450sd]

check fuse #22 in the fuse box under the hood.if blown disconnect the fuel heater(top plug on the fuel filter housing,looks squarish) replace the fuse and see what happens

 

[OLDBULL8]

check fuse #22 in the fuse box under the hood.if blown disconnect the fuel heater(top plug on the fuel filter housing,looks squarish) replace the fuse and see what happens

Sounds like that is the problem. Here is the heater replacement from an IH truck dealer, $26 in the lower US.

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