Runnnn away 7.3, then....boom. - Ford Powerstroke Diesel Forum
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Old 04-11-2011, 10:48 PM
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Runnnn away 7.3, then....boom.

long story short got a bud with a 7.3, had a turbo go bonkers, the motor ran away and over revved by itself, ate up the turbo, so he replaced a piston(everything else checked out), put it all back together new turbo and all... got it to run then it just died.

swapped IDM's, nope not that. IPR is good as well.
Ran on ether(dumb dumb i know i wouldnt) and really rough, put a gauge on the oil rail and got 600psi at idle and max 1300 psi revving..

Im thinking its possible the hpop did get damaged revving the motor up that high and out of control, what do you all think?

Thanks..

EDIT: also tons of white smoke when they got it to run on ether for a few minutes. Also managed to pull a code with the superchip and it was the ICP low code, sounds like its time for a hpop.

Last edited by Dietoremain; 04-11-2011 at 11:42 PM.
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Old 04-12-2011, 04:57 AM
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sucks, man sorry to hear that. They sure it wasnt like an injector stuck open, how would the turbo cause the truck to rev itself?
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Old 04-12-2011, 06:02 AM
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All of our old tractors puff white when you assist start with ether. So I don't know if I would be concerned with that.

Bigger concern would be what would cause the motor to run away?
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Old 04-12-2011, 06:08 AM
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This may be a dumb question so sorry if it is but why wouldn't the rev limiter have kept it from over reving? I would understand the dieseling but not over reving?

If your getting 600 at idle, I would think you should be able to idle pretty nice and just not have any power, right?
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Old 04-12-2011, 06:23 AM
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icp, ipr or hpop are my thoughts.

have you check compression in all cylinders?

justin - the runaway was likely cause by self fueling, leaky injector or oil getting into the cylinders or intake, so no control over fueling.
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Old 04-12-2011, 07:18 AM
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Quote:
Originally Posted by ridiculously_necessary View Post
icp, ipr or hpop are my thoughts.

have you check compression in all cylinders?

justin - the runaway was likely cause by self fueling, leaky injector or oil getting into the cylinders or intake, so no control over fueling.
That makes since now. Hard for a computer to shut it down when its bypassing every thing. Thanks
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Old 04-12-2011, 07:30 AM
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Diesel engine "run away" is usually when the turbo seals let loose, letting oil into the cylinders. The oil ignites and and continues to burn and makes the engine take off out of control because you're not controlling the "fuel" intake by the engine. It's feeding itself, therefore, you can't stop it you're just along for the ride.
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Old 04-12-2011, 07:35 AM
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Quote:
Originally Posted by Dietoremain View Post
long story short got a bud with a 7.3, had a turbo go bonkers, the motor ran away and over revved by itself, ate up the turbo, so he replaced a piston(everything else checked out), put it all back together new turbo and all... got it to run then it just died.

swapped IDM's, nope not that. IPR is good as well.
Ran on ether(dumb dumb i know i wouldnt) and really rough, put a gauge on the oil rail and got 600psi at idle and max 1300 psi revving..

Im thinking its possible the hpop did get damaged revving the motor up that high and out of control, what do you all think?

Thanks..

EDIT: also tons of white smoke when they got it to run on ether for a few minutes. Also managed to pull a code with the superchip and it was the ICP low code, sounds like its time for a hpop.
Did you re-ring the whole motor while you had it down? If not I would definetly run a compression test on it to eliminate that. If that checks out then its probably some thing a little more simple like ridiculously_necessary was asking about.
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Old 04-12-2011, 09:10 AM
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thankfully not my truck, a friends, and he replaced a piston and reinged the one, did a compression test on everything that was the only one that was low which he replaced.. now this happened... so yeah im leaning towards HPOP for sure now.
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Old 04-12-2011, 02:40 PM
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Did he pull the ICP and check it? Run it w/ the ICP unplugged?

I would just check that before the HPOP.... but it does kinda sound like it.
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