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Message: [QUOTE="IHPowerstroke7.3, post: 1417900, member: 7642"] As a dealer tech 9 out of 10 times I get the chance to talk to "tech hotline" or an "engineer" it amazes me how little they really know. There have been times when I have run into strange circumstances and have gone above and beyond to diagnose an issue instead of throwing parts at a vehicle to prove the point that the part won't correct the issue. Whenever bean counters get involved it just makes it worse. Now to your truck's issue, P0016 is a camshaft/ crankshaft correlation (timing) code. It could be caused by a wiring/ sensor issue/pcm issue, I wouldn't rule electrical out. I believe you said the truck has an rpm signal which is measured at the rear of the crankshaft. They did a compression test, proving that the crankshaft is not broken and all pistons and rods move. However since the cam drive and high pressure fuel pump drive gears are driven off the front of engine, something could be a mess there. It builds rail pressure, so you know that cam is turning along with the HPFP gear. I can't see excessive crankcase pressure causing anything but seals to fail but anything is possible. However I feel it could have been a coincidence when you heard the (pop) noise. You said that the engine would run on carb cleaner i believe, along with that and a good compression test, i see no reason to pull a head. If the actual cam timing was off that far, it wouldn't have good compression numbers. That leads me to believe its one of two things. Camshaft gear has moved on the camshaft or crankshaft gear has moved on the crankshaft. [/QUOTE]

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