truck quit without warning.

[Soot_Life]

so i was pulling out of my driveway running fine and the engine instantly shut off.everything appears normal.

1/2 tank of fuel
pcm checked
fuel bowls full
cranks fast
fuses all checked out

mech fuel pump sounds a bit louder than normal but i could just be paying more attention.
cps just go out instantaneously?
would trying starting fluid tell me anything?

[TulsaDave]

I wouldn't use starting fluid. You can really damage your motor. It's not sending fuel for a reason. Don't force it to fire.

My first guess would be the icp sensor or the HPOP... Do you have a way to check icp pressure while you are cranking? I think it has to be greater than 500 before it will send fuel.


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[Soot_Life]

not familiar with "icp pressure " possibly give me a quick run through

[TulsaDave]

Crap. I'm in the wrong section. It's a 6.0thing. I'm sorry. I'm not familiar with 7.3's at all.




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[Soot_Life]

haha no problem. did check my ipr sensor the harness has oil in it I'm sure that's not good. heard i can run with it disconnected just to troubleshoot. any Intel on that?

[madpogue]

If it's the sensor, not the regulator, you're talking about, then yes, if you disconnect it the PCM sets a default pressure and you should at least be able to start the engine. And indeed, if that connector is oil-sodden on the electrical side, the sensor is shot and is the likely cause of your no-start.

[helievacpilot]

I would still suspect the CPS. Yes, it will instantaneously shut the truck down. You didn't say if the truck fired right back up or not. If so, the CPS could still "test" good, and just starting to fail. That's what mine did.
- Bill

[Soot_Life]

Cps changed mechanical fuel pump changed ipr unhooked, cranks over with a gas rag , 50paint at the the pressure regulator, still just a big air compressor..

Any ideas.?

[jjohns816]

Originally Posted by Soot_Life

Cps changed mechanical fuel pump changed ipr unhooked, cranks over with a gas rag , 50paint at the the pressure regulator, still just a big air compressor..

Any ideas.?

CPS can be bad out of the box... did you use an international or ford part? Tach should bounce to about 100rpm while cranking. If tach doesn't bounce it could still be the cps. Check the level in your HPOP. Is it about 1 inch from the top? If HPOP is empty fill it up and see if it fires up. My LPOP went out so it was not filling HPOP up and my truck would only crank and not put out any white smoke.

[dirtfreak51]

yea it sounds like the cps, deff do not get the autzone ****, go with the dealer part, i hate going to the dealer but especially with the obs youll have to get most of your parts from them, atleast some parts