'07 PCV Upstream ?
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#9
A leak from the crossover tube wont cause knock codes but a head gasket starting to fail can cause coolant loss (burned during cruise) and cross pressurization (in boost) leading to lean AFR's. A bad valve cover allowing oil into the intake track will cause knock. How many miles on the engine? Has the valve cover been replaced? How long ago.
#10
A leak from the crossover tube wont cause knock codes but a head gasket starting to fail can cause coolant loss (burned during cruise) and cross pressurization (in boost) leading to lean AFR's. A bad valve cover allowing oil into the intake track will cause knock. How many miles on the engine? Has the valve cover been replaced? How long ago.
#11
Well damn. Sounds like it might be about time to roll up the sleeves. The good news if you do most of the work yourself is that a cylinder head shop will probably only charge you about $350 to replace the seals and do a valve job. Had a head done for a friend not to long ago and thats all they charged. YMMV though.
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