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What is the small tube going into the valve cover on the drivers side of a 98 chevy blazer 6 cyl engine because it is very noisy and vibrates?
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PCV. Positive crankcase ventilation. It removes and reintroduces gasses from the crankcase back into the intake.

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Answers.com > Wiki Answers > Categories > Cars and Vehicles > American Cars > Chevrolet > What is the small tube going into the valve cover on the drivers side of a 98 chevy blazer 6 cyl engine because it is very noisy and vibrates?