Thread: Ask a tuner...
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Old 02-28-2011, 05:41 PM   #393
P3Auto
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If you took the oil cap off while the engine is running then yes there is crank case pressures. This is normal and this is why there are 3 or more crank case and valve cover vents.

The loud whistle could be a lot of things. Turbo going bad, air filter issue, boost leak, etc.

I doubt it is related to the oil cap unless you left off or forgot the rubber oring around the cap, even that would not cause and loud whistle I think.
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