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5th & 6th Generation (2002-2006 & 2007-2011) Toyota Camry Discussion for years: 2002-2006 & 2007-2011 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 04-21-2008, 10:48 AM   #1 (permalink)
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Gen5 Vaccum or not

When the motor is running and the oil filler cap is off, should you feel a vacuum or air blowing out and why do you feel anything? Should this change as the motor warms up?

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2003, 4cyl, Camry
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Old 04-21-2008, 11:31 AM   #2 (permalink)
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You would typically feel air blowing out, This is blow by, which is combustion that seeps past the piston rings.

This is why there is a PCV system (Positive Crankcase Ventillation). The PCV system relieves pressure from the crankcase, if the system becomes clogged, the most common side effect is an engine that leaks oil from everywhere because the increased pressure blows out the gaskets.
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