95 460 shuts down randomly

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Dec 25, 2013 | 06:22 PM

87diesel

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95 460 shuts down randomly

I have a '95 ford f350 crew cab dually with a 460 in it and dual tanks. We hadn't had any problems until recently when the truck ran cold on a trip. I figured it was the thermostat stuck open so we put cardboard behind the grille to bring it up to temp. Then on the way home the engine shut off. I turned the key off and back on and it started right back up, no check engine light. The next day we drove it again and it did the same thing regardless of what tank was used. I don't know what would cause it. Any advice would help. Thanks.

Dec 26, 2013 | 05:08 AM

Necred

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I believe theres an issue with the distributor "PIP", you may wanna do a search on it...Most folks have them replaced before 100k...

Dec 26, 2013 | 09:35 AM

87diesel

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What does the PIP sensor do?

Dec 26, 2013 | 10:01 AM

87diesel

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Another thing i forgot to add was when it died the fuel pump wasn't kicking on until we turned the key to off a couple of times. Then it would work and start right up.

Dec 26, 2013 | 04:22 PM

rla2005

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Quote:

Originally Posted by 87diesel

Another thing i forgot to add was when it died the fuel pump wasn't kicking on until we turned the key to off a couple of times. Then it would work and start right up.

This symptom is classic for a failing computer (PCM) but it could be as simple as a bad Fuel Pump Relay. The fuel pump should kick on for 1-2 seconds when cycling the key from the Off to Run position. You could swap the Fuel Pump relay with the horn relay to test.

If swapping the relays does not help you might want to pull out the PCM, it comes out from the engine side of the firewall, then open it up to look for signs of corrosion, moisture, leaking capacitors or burned components.

Dec 26, 2013 | 04:39 PM

87diesel

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where's the fuel pump relay located?

Dec 26, 2013 | 04:41 PM

kermmydog

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I would also check fuel pressures. What about fuel filter. My 95 had 148,000 & the PIP was still fine. Something else on random stuff which can drive a man to drink. Check the top distributor bushing. I had an 86 F250 4x4 460 that drove me to complete insanity. I had a couple of buddies that were good mechanics they messed with it, after about a month of just dying then starting right up again one of my mechanic buddies called me & said bring that truck to my house. Sure enough he pulled the cap & the he could move the shaft enough that every so often the stator would hit the pickup & short out.

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Dec 26, 2013 | 04:45 PM

87diesel

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alright thanks ill try the relay first

Dec 26, 2013 | 04:50 PM

#10

kermmydog

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All the relays in mine are 7 pin so you can swap any of them around. I doubt that is the issue. It seldom is on Fords. But good to check just the same.

Dec 26, 2013 | 05:21 PM

#11

rla2005

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Quote:

Originally Posted by kermmydog

All the relays in mine are 7 pin so you can swap any of them around. I doubt that is the issue. It seldom is on Fords. But good to check just the same.

I wanted to start with the simple and easy things first. The relays are not known for going bad, but it is not impossible. I highly suspect the PCM at this point, but never overlook the obvious (and simple/cheap).

Jan 3, 2014 | 10:03 AM

#12

87diesel

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The relay didn't work i was going to go to a shop and let them test the computer would that help out?

Jan 3, 2014 | 12:51 PM

#13

rla2005

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Quote:

Originally Posted by 87diesel

The relay didn't work i was going to go to a shop and let them test the computer would that help out?

I did not point out to also check the Fuel Pump fuse "O". The photo I posted before shows it's location. If that fuse is blown there is no power for the fuel pump.

Circuit diagram: