Possessed 7.3 running WOT wouldn't shut off - Ford Powerstroke Diesel Forum
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Old 06-06-2011, 11:13 PM
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Possessed 7.3 running WOT wouldn't shut off

long story short...I Had an air filter boot come loose on a 2000 7.3 and suck into the turbo..bound the comp wheel up and wobbled the shaft loose ... I replaced the turbo and while my truck was down the batteries drained and i noticed a buzzing from inside the cab one time W.T.F??? i dunno.. got ready to start it up hooked up my starter/charger and it started right up... idled fine for a second then started ideling faster and faster so i turned the ignition off and HOLY @%$*%! it started running WIDE OPEN with the key off ..I ran to the front and yanked the cables off " i know i know what good is that gonna do" it ran wide open for about 10 seconds and died...it blew smoke hard enough that several neighbors from the next street over came outside looking for a house fire asking w.t.f were did all that smoke come from... ......So what would make this 7.3 do this???
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Old 06-06-2011, 11:18 PM
spool up that turbo!!


 

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Originally Posted by fazt201 View Post
long story short...I Had an air filter boot come loose on a 2000 7.3 and suck into the turbo..bound the comp wheel up and wobbled the shaft loose ... I replaced the turbo and while my truck was down the batteries drained and i noticed a buzzing from inside the cab one time W.T.F??? i dunno.. got ready to start it up hooked up my starter/charger and it started right up... idled fine for a second then started ideling faster and faster so i turned the ignition off and HOLY @%$*%! it started running WIDE OPEN with the key off ..I ran to the front and yanked the cables off " i know i know what good is that gonna do" it ran wide open for about 10 seconds and died...it blew smoke hard enough that several neighbors from the next street over came outside looking for a house fire asking w.t.f were did all that smoke come from... ......So what would make this 7.3 do this???
Sounds like its sucking oil out of the crank case somewhere
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Old 06-07-2011, 12:33 AM
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Originally Posted by hollister25073 View Post
Sounds like its sucking oil out of the crank case somewhere
yup this happened to a friend of mine, it took off on him. sounds like oil eating to me.
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Old 06-07-2011, 08:25 AM
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would a stuck valve cause that to happen? or a fuel pump relay ? i did just check the codes and got a p0231
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Old 06-07-2011, 08:40 AM
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Where did you get the turbo you used to replace the damaged one? It sounds like it's running on it's own oil and is normally caused from a bad compressor side oil seal.
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Old 06-07-2011, 08:51 AM
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I bought the turbo from a guy i met thru this site actually, He's been more than helpful and seems like a straight up knowledgable guy. I'm not sure i understand what you mean by "running on it's own oil" ?
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Old 06-07-2011, 09:18 AM
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i think he is saying that the oil seal in your turbo is leaking oil into the intake. so much so that it is fueling your run away motor. could it be that a bunch of oil made it into your intercooler when you destroyed the old turbo? have you tried to start it since?
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Old 06-07-2011, 09:20 AM
spool up that turbo!!


 

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Originally Posted by fazt201 View Post
I bought the turbo from a guy i met thru this site actually, He's been more than helpful and seems like a straight up knowledgable guy. I'm not sure i understand what you mean by "running on it's own oil" ?
The turbo is taking oil from the engine and pushing it into the cylinders which makes it take off like that and usually the only way to stop it is too shut off the air supply
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Old 06-07-2011, 09:48 AM
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This is called a "runaway" it is common with diesels that are cranking out huge numbers. Below is a video of a cummins running away after a sled pull. Basically what happens is in some way (normally a blown turbo seal) lubricating oil gets into the cylinder which acts as fuel. Since engine oil and diesel fuel are very similar the motor will run. Regardless of the electronics being turned on or not the engine will run until it runs out of fuel (oil), the air is shut off, or something mechanical breaks stopping the engine abruptly. Check your seals and engine oil before trying to start it up again.

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