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.

A: Hello. Black smoke from the exhaust is the ...

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: a/c question

This is usually the result of an electrical switch in the A/C system. Electrical components are uniquely affected by temperature. Even if the system is full, it can act as you have described. The system may have been low at...

Q: Oil leaking from oil pan gasket

The oil pan gasket is made from a rubber compound and if the pan is over tightened the rubber is pushed out and will cause the pan to leak. The system needs to be checked to make sure there are...

Q: Are fuel injector banks and catalyst converters considered different issues and warranties?

Question sent to CS for warranty information regarding fuel injectors and catalytic converters for a Chevrolet 2010 V6-3.6L.

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...