Quote:
Originally Posted by Dackelone
Crankcase vapors! PCV (or CCV crank case vent) is where the oil vapors come from and buildup on the hot intake valves.
Blame D.I. and long oil change intervals - hence the oil gets thinner/diluted and ends up on your intake valves.
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How is this dirt related to leaky injectors(rough cold starts and missfires )?