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On a 2008 6.4 powerstroke, ran perfect then started smoking

Second opinion] on a 2008...
Second opinion] on a 2008 6.4 powerstroke, ran perfect then started smoking slightly and missing a bit, no hard knock or anything, was showing code for cyl 8, turned inj off & on with scanner and it didn't do anything... so I was going to replace inj but did a quick compression test and gauge won't even lift. put my finger on GP hole and very little pressure. rockers move fine. can a piston blow out totally without sounds? It did also dump a pile of coolant out the rad cap then as well that hadn't before. But the cap doesn't hold pressure when I tested it. So can a HG blow out in a way to cause it or a piston toast? Rest on that side have 200psi across the board... Is there any chance that a valve or HG can cause all these issues?? I don't want to pull the head in the truck if theres no chance of it being hgs or valves. I want to rather then pull the whole engine.
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Answered in 1 hour by:
10/18/2017
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 16,066
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Hi, my name is ***** ***** is most likely the headgaskets, 200 on the others is also low, but the HG can also cause this, what color was the smoke when it was running?

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Customer reply replied 1 month ago
light colored.

then this would be coolant,you have a bad headgasket, and as yo know, these have a very common problem with blowing the head gaskets,Tim

Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 16,066
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Verified
Tim Mohr and 87 other Ford Specialists are ready to help you
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Customer reply replied 1 month ago
True.... Thanks!

Anytime my friend,Tim

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Tim Mohr
Tim Mohr
Tim Mohr, ASE MASTER TECH
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