Question about 1984 Porsche 944

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My car will not idle its getting to much gas. blows black smoke out the tail pipe. runs at high speeds but not at idle? any suggestions?

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It could be the cold start valve is staying on. I would also check the thermo-time switch. Check the cold start valve for power after the car is warmed up.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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My truck blows white smoke


Hello!
There are two differnt reasons for black and white smoke coming from the tail pipe.
Black smoke means fuel runs rich (car getting to much gas). Check fuel pressure/air filter.
In some cases the white smoke means car is burning oil or transmittion fluid. Have tem checked/replaced.
If you can feel a smelly smoke it can be catalytic converter.
In a worsest scenario if car blowing white smoke it can be engine coolant is getting into an engine cylinder from a bad head gasket ,or a warped/cracked head. So you need to keep your eye on coolant level and check your engine for overheat. Also might be good to check your oil for traces of coolant (on a dipstick it would be a milky substance mixture of oil and coolant).
Good Luck

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