Burning carbon from exaust.no power when pushing gas

you could have a leaking injector or a misfire..have you had it check for trouble codes...most major auto parts stores will check for trouble codes for free

Could be a faulty O2 sensor. The sensor would not take action until the engine warmed up. Have you checked for trouble codes in the engine computer ?

check the coolant level, if it is low or empty chances are a blown head gasket. A leak in the head will draw the anti freeze into the cylinders and burn

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.

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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

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.

i think you will need to return car to BMW and ask for a reset of the management system ,i hvae no idea as to what this weekend boy racer gizmo could have done to your car but i suspect that the change in fuel mixture caused it to burn the O2 sensors out and also this has burnt the cat out so its going to be an expensive sort out job,i was taught at college 40+years that if you want a faster car buy a jaguar or a ferrai thats built with power in the design not try to add it later as the braking and chassis is not designed for this sort of increase in power ,

You most likely have a bad fuel pressure regulator which is causing the fuel to dump into the cylinders and flood the car.

is it leaking, or burning in the combustion chamber? Comming out the tail pipe? Blue smoke is oil, white smoke is water, black smoke is carbon. Smell your exaust; smell like "prestone"? Does the engine over heat? My guess would be a bad head gasket. Is the oil a light brown color?

EGR valve stuck or not working clean or replace