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Black smoke coming out the tailpipe usually indicates excessive fuel is being burned weather it be a gas or diesel engine. Oil will usually be blue. The first place for a DIY to look I suggest would be the air intake system especially the air filter. If you have an older vehicle that has a carburetor be sure the choke is fully opened when engine is at operating temperature and look down the venturis to see if fuel is pouring in at an idle. It should not show fuel delivery thru the hi-speed circuit at an idle. If you have a fuel injected vehicle check the fuel pressure if you know how and have the computerized control system diagnostics performed; you'll need a scan tool. If the engine has a mis-firing cylinder that also will cause excessive black smoke and have that 02 sensor showing rich. If the 02 sensors show a RICH condition I suggest you see first what is causing that rich condition before you go ahead and spend your hard earned coins on a new 02 sensor(s)! My experience has shone that if an 02 sensor shows a rich condition and you have black smoke pouring out the tailpipe the 02 sensor is doing its' job and replacing it won't do the fix.

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Q: What can cause black smoke to come from the exhaust?
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