Any 7.3 owners?

[CATCHDAWG]

Driving down the road and the truck just shuts off. No light, no cutting out, no nothing! Runs perfect then quits? You can let it sit about a hour and it cranks and runs fine, might make it ten miles might make it a mile and shuts off again. It is NOT the camshaft sensor, done replaced that and the fuel filter. I know low oil pressure will do that but I should have a light if that was the case. What could be causing this? My yota is down also and I'm out of vehicles, got to get this fixed and preferably get it right the first time! Lol

 

[DocHunter]

My 7.3 did something similar and it turned out to be a fuel line. Next time it happens look where the fuel lines make their turn down into the tank. The lines go from metal to rubber near the tank. They become weak over time and will collapse. My fuel bowl where the filter is located would be almost empty of fuel, I would let is set and after a few minutes, it would fill back up and start.

 

[Hunter 257W]

That is a classic failure of an ignition coil. The coil gets hot and stops working, cools down and works fine. Of course this assumes your engine has just one coil that fires all cylinders. And that's also assuming you aren't talking about a diesel.

 

[medic]

Sounds like it is running out of fuel could be the fuel pump is going out it is under the drivers side door on the frame. Call Diesel Plus in Ringgold Ga they are the best around and great to deal with.

www.dieselplus.com

 

[wskp11]

Fuel pump could be weak or might be the the cps I've got new ones that were bad. With diesels I've found I always buy Ford not aftermarket much better success. Could also be the tps, which if you pull and clean with some electrical cleaner should do the trick. Best thing with 7.3's is simplicity just don't over think it.

 

[CountryBoy053]

Hunter, all 7.3 is a Powerstroke Diesel.

And catchdog. If you have low oil pressure it will studder, and seem EXTREMELY sluggish. Will puff out white smoke and then will die. If its not doing that, its not oil. But might as well check your levels.

If sounds like a fuel line, or fuel pump. I know you said you changed fuel filter, but check it out just to enusre its all fine.

 

[cecil30-30]

what about the crank sensor? My dads 96 7.3 powerstroke did almost the same thing.He was pulling his horses down the road at 55mph and it just shut off like you turned the key off and never would start back.Took it to the dealership and it turned out to be the computer/brain box went out.$900 later and it was fixed.

 

[CountryBoy053]

It could be Cecil, but it the computer went out, his truck wouldnt start back up after it sits and "rests"

 

[lungpuncher1]

Its the cam posistion sensor.

 

[cecil30-30]

Its the cam posistion sensor.

Thanks what I was trying to think of.

 

[Unicam]

Its the cam posistion sensor.

Thanks what I was trying to think of.

He said it was not the cam sensor. Sounds like an air/fuel delivery problem.

 

[Unicam]

It could be Cecil, but it the computer went out, his truck wouldnt start back up after it sits and "rests"

If the computer is failing it can act like a coil on a gas motor. The computer gets hot it shuts the motor down and after computer cools down it resets and your running again. Cold solder joint maybe? Still think its a fuel delivery problem. Check the relays under the hood too.

 

[CATCHDAWG]

Fuel delivery makes the most sense but shouldn't it cut out or at least do something before it stops? It's like just turning off the switch, no warning signs at all? It ain't easy trying to control a nine thousand pound truck when it quits running! And once again, IT IS NOT THE CAMSHAFT SENSOR, I put two of them in.

 

[TeamMainStreet]

If it was fuel or oil pressure either one it would smoke and miss like crazy until it quit as well as when it finally did restart. Sounds like a bad ECM/IDM if it restarts after sitting a while.

 

[CountryBoy053]

If you were closer i'd meet up with you and run my diagnostic code reader on it and see what it pulls up lol.

And TeamMainStreets post does make more sence than mine, I know the oil pressure would make it smoke and miss, seen it happen to my father in laws f350. So i would assume it would at least start missing with less fuel. So give the ECM/IDM a looking into

 

[TeamMainStreet]

Also, I know you said you have replaced the Cam sensor twice but if you didn't get it from either Ford or International I would replace it again with one from either place, preferably International. Autozone and Advance don't cut it on stuff like that most of the time,

 

[WGK]

Lungpuncher1 nailed it and ford had a recall on that problem. I would check with my local dealer. Might be a free fix.

 

[280longshot]

I had a 7.3 for 11yrs and the only problem I had with it was the cam sensor. It would die going down the road, stop and I could start it right back up.
At this point it's about guessing unless you take it and have it hooked up to a diagnostic machine.
I do remember Ford sending out a recall notice about it.

 

[CATCHDAWG]

Also, I know you said you have replaced the Cam sensor twice but if you didn't get it from either Ford or International I would replace it again with one from either place, preferably International. Autozone and Advance don't cut it on stuff like that most of the time,

I got the sensors from Ford. I could be wrong but I just dont see two in a row being bad...

 

[CATCHDAWG]

Well, I finally got around to fixing my truck! I told y'all it wasn't the camshaft switch! Lol. It turned out to be the oil injection pump, so if any of you diesel owners ever experience the same symptoms with your truck don't overlook this possibility. It's also not a cheap or easy repair!
Btw,Sorry I didn't know how to add "update" on the post title. This is a old topic...