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Engine runs rough black smoke smells raw gas - 2003 Chevrolet Tahoe

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COULD BE FAULTY FUEL PRESSURE REGULATOR OR WEAK SPARK IN THE IGNTION SYSTEM.EVAP SYSTEM COMPONENT HAS FAILED OR CANISTER FUEL SATURATED,FUEL CONTROL SENSOR OUT OF CALIBRATION ECT IAT OR MAF.BAD HO2S SENSOR FAILED.HAVE VECHICLE SCANNED TO CHECK FOR FAULTY SENSOR BECAUSE SENSORS ARE TOO EXPENSIVE TO REPLACE IF YOU DONT NEED IF.

Posted on Aug 28, 2010

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I have a 92 blazer 4.3 vortec


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

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Mar 04, 2012 | Cars & Trucks

1 Answer

I have a 92 blazer 4.3 vortec


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Mar 04, 2012 | Cars & Trucks

1 Answer

I have a 92 blazer 4.3 vortec


Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | Cars & Trucks

2 Answers

Black smoke>fuel consumption>rough idle


Hi there:
Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | Cars & Trucks

1 Answer

I have white smoke coming from my tailpipe in my 01 chevy impala, also engine coolant is leaking on the right side of the radiator where a little white smoke comes out if the car is running for about 10...


I have an 01 Impala 3.8 engine. At first start-up white smoke is seen, smells like raw gas, and tail pipe is black as coal. Fuel milage isn't good either. Would the regulator be bad?

Feb 24, 2011 | 2001 Chevrolet Impala

1 Answer

Black smoke comes from exhuast when engine gets hot


black smoke is raw gas burning. a rich condition could be the cause---a bad oxygen sensor, a bad map sensor, a bad fuel pressure regulator, a plugged up air filter, or bad injector. if it was a oil problem then you can smell it. when after running til hot. shut off engine and rub finger around inside of tailpipe to tell! have a good one!!

Nov 15, 2010 | 1998 Volkswagen Passat

1 Answer

2005 amante V6 started running rough, smell of raw gas, chk eng light on white smoke smelling of raw gas. changed plugs , wires, ran injecter cleaner through, gets about 1 mile per dollar of gas ....


Run a compression test. Sounds like a bad head gasket, letting coolant into the cylinder and causing misfire. I think you will find one (or two adjacent) cylinders have much lower compression than the others. There should not be more than 20% difference from highest to lowest.

Sep 05, 2010 | 2005 Kia Amanti

1 Answer

1993 lumina euro is blowing black out of tailpipe smells gas


Black smoke is unburned gas. If the car is running fine besides the black smoke, it's most likely the Coolant Temperature Sensor. The part is roughly $20 and an easy fix.

PS- I'm guessing your check engine light is on...

Jul 10, 2009 | 1996 Chevrolet Cavalier

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