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What does it indicates when black smoke comes out from the muffler?
1990 Toyota Corolla

What does it indicates when black smoke comes out from the muffler?

(1990 Toyota Corolla)
smoke comes out continuously even after rev...
1 answer & 1 comment
Popular Answer
Black smoke out the exhaust is excess fuel, blue smoke is oil being burned. An engine that is burning oil will show signs of blue/gray smoke coming out the tail pipe when you first star the car in the morning? If so it would be a sign of worn valve guides or valve guide seals.Worn guides or seals may also exhibit being a problem if after prolonged idle at say a traffic light, when you pull away blue smoke is emitted from the tail pipe. Get a friend to follow you on the freeway on hard steady acceleration is there any "blue" smoke out the tail pipe, this would be a sign of bad piston rings, damaged pistons or a worn engine cylinder bore. Some engine oil "burning" is acceptable. I saw one manufacturer say they would not even investigate an "oil consumption problem" on a brand new car if it was not more than 1 quart every 800 miles. That to me is unacceptable! Their is a test called a cylinder leakage test where compressed air is put in an engines cylinder with its valves closed to determine if an engine has cylinder head gasket, intake or exhaust valve, or worn piston rings/cylinder bore. It is a very valid test to determine the over all health of an engine.
If you had a leaking fuel injector it could allow too much fuel into the engine or a defective coolant temp sensor could allow too much fuel into the engine which would emit black smoke out the tailpipe.
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thank you very much. God bless!
General Diagnosis
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Black smoke out the exhaust is excess fuel, blue smoke is oil being burned. An engine that is burning oil will show signs of blue/gray smoke coming out the tail pipe when you first star the car in the morning? If so it would be a sign of worn valve guides or valve guide seals.Worn guides or seals may also exhibit being a problem if after prolonged idle at say a traffic light, when you pull away blue smoke is emitted from the tail pipe. Get a friend to follow you on the freeway on hard steady acceleration is there any "blue" smoke out the tail pipe, this would be a sign of bad piston rings, damaged pistons or a worn engine cylinder bore. Some engine oil "burning" is acceptable. I saw one manufacturer say they would not even investigate an "oil consumption problem" on a brand new car if it was not more than 1 quart every 800 miles. That to me is unacceptable! Their is a test called a cylinder leakage test where compressed air is put in an engines cylinder with its valves closed to determine if an engine has cylinder head gasket, intake or exhaust valve, or worn piston rings/cylinder bore. It is a very valid test to determine the over all health of an engine.
If you had a leaking fuel injector it could allow too much fuel into the engine or a defective coolant temp sensor could allow too much fuel into the engine which would emit black smoke out the tailpipe.
Sign in to reply
thank you very much. God bless!

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