Black smoke tailpipe and smell like gas - 2003 Land Rover Discovery

white smoke indicates blown head gasket or head , get the cylinders compression tested , have the OBD codes read to give you some idea of any components faulty

Running rich. Does black smoke come out of the exhaust ?

White smoke is water vapor and in this cold climate it is normal. Strong gas smell is not normal although you may smell some while engine is warming up. Bad cat converter can produce smells, but usually more like rotten eggs. If engine is running rough and seems rich, check coolant temp sensor. Bad converter can cause stalling too. Otherwise, idle speed is controlled by idle air contol motor which can get dirty and stick. Any codes set?

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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your tail pipe is always going to smell like gas the white smoke is oil being burned from worn out valve guides or rings.

It could be either the engine, catylitic convertor if the smoke is black. If the smoke coming out is white it could be engine coolant problem. If it is not getting enough power it could be the carburator not getting enough gas.

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!!

You might have a louse timing belt, and your car might be out of timing.

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...

your catalytic converter is likely not working properly. That explains the raw smell and the black smoke.

Either that or you are leaking gasoline onto the exhaust from the car.