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Got a 2007 6.0 F20..was driving down the road and the boots gauge maxed out and truck died....now it wont even turn over...there was oil that came down from passenger side. Was wondering what it could possibly be?
 

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When you say it won't turn over - you're saying the starter isn't engaging at all now? Or that it won't start? That will help determine the next tests.
 
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Probably a catastrophically failed STC fitting, but that wouldn't keep it from cranking.
 

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Try engaging the starter by jumpering the starter solenoid wire to the passenger battery + terminal.

Disconnect starter solenoid wire (yellow wire with light blue stripe) at the connector along passenger side of engine compartment, and touch on battery positive to crank. It is adjacent to the passenger side battery in the engine compartment, near the vacuum pump that has a "squeeze-and-pull" type connection.


 
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Highly likely that you have a bad starter then.
 

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Just to make sure that it isn't hydrolocked, can you rotate the engine by hand?
 

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Hope you don't mind me asking, but how did you try rotating it by hand?
 

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If your ratchet was 12" or longer, then it should rotate. Sounds like time to pull the glow plugs and try again.
 

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Yeah - it sounds like it because you should be able to rotate it by hand - assuming a reasonable amount of force behind a decent sized ratchet.

That said, you haven't described anything that describes coolant OR fuel filling a cylinder. Usually you would see white smoke and even liquid in the exhaust - at least for a bit before it died.

Sometimes you can see liquid stains at the exhaust manifold bolts.
 

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Maximum boost might be an indication. I missed that. Do you still have a functional EGR cooler? If so, you might want to pull the EGR valve and see what is in the intake manifold.
 
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