Re: spark plug issues, no compression in front three cylinders help please!
Looks like you had detenotation and busted some pieces of the ring lands off the pistons. The pieces probably crushed the plugs and got into the valve seats preventing them from sealing the combustion area. Looks like rebuild time. Do a leakdown to be certain but I'm betting the ring lands are shot. Oh and hate to even say it but pieces may have gotten into your turbo also.
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