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What might be the cause of white smoke coming from the air filter exhaust pipe in my 1975 Pontiac Firebird?
Wiki User
∙ 14y ago
White Smoke is a symptom of coolant in the combustion chamber. A blown head gasket or cracked head is the most likely cause. Stop drivng the vehicle immediately as serious engine damage will occur. Get this fixed ASAP.
There is a second possible explanation. It could be blow by. All engines have some amount of blow by.....but as piston rings wear, this can get worse. The way blow by and pressure is handled in most engines is through the PCV valve. The valve pulls these gases into the intake to be burned in the combustion cycle. If the valve is stuck closed, or missing altogether, the gases will build up and eventually start coming out through the air filter exhaust pipe as you've described.
Wiki User
∙ 14y ago
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