Skip the auto shop - Our mechanics make house calls

Q: Smell gasoline and see black smoke from exhaust

asked by on

I smell gasoline and see black smoke coming out of the exhaust.

Hello. Black smoke from the exhaust is the first sign of a rich condition. This means too much fuel is entering the engine. This can be caused by a number of reasons from a leaking fuel injector to a failing sensor. In some drastic cases, it can even be an internal engine failure. A mechanic would typically install a computer scan tool that reads engine data to see what the sensors are seeing. This will let them know if a sensor is reading incorrectly. If not, then it may be a fuel injector that is stuck open. The best place to start is with a scan tool so that you do not replace any parts that are not needed. If you do not have a scan tool, then you should enlist the assistance of a certified mechanic to scan for fault codes and replace any failing parts.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Lights out

When vehicle headlights go out, normally a simple fuse or light bulb replacement can correct this issue. However there is a known problem where the headlamp assemblies, sockets and wiring are melting due to high heat and resistance in this...

Q: Bad mileage & strong gas smell in dipstick/oil pan - 1996 Nissan 300ZX

Okay, so usually the answer to problems are usually hidden in the fine details. The whole reason you started noticing a problem was the gas mileage. If this was my car, I would be thinking that I have a fuel...

Q: Car key loose in the ignition

There is a common problem with the batteries on that car that will cause the engine not to crank. You need to have the battery load tested to see if it has enough cranking amps to crank the car. A...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...