Skip the auto shop - Our mechanics make house calls

Q: There is heavy black smoke during driving.

asked by on

Heavy black smoke during driving

My car has 57430 miles.
My car's transmission is unknown to me.

Heavy black smoke is usually a sign of a rich fuel condition present in your car’s engine. When this happens, the motor is receiving more fuel than it can otherwise burn during the regular combustion cycle. This excess fuel is sent out the exhaust in the form of black smoke as you have experienced. This can happen for many reasons such as a faulty mass air flow sensor, which is what monitors the air intake signaling the ECU to provide more or less fuel.

This may also be the result of a leaking fuel injector that is leaking too much fuel into the motor at once. I would recommend having an expert mechanic, such as one from YourMechanic, come to your location to determine why the car is emitting smoke.

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: Something loose in dashboard or steering column

A rattling noise from under the dash can be multiple things one of which could be a loose wiring harness bracket rattling against something. There could be fastener nuts that have backed off loosening components causing a similar issue. An...

Q: i'm looking for a radiator fan for my 2010 hyundia Sonota. What model sonotas can I get one off of to work on my car?

Hello, thank you for writing in. Without knowing the sub-model of the vehicle it is difficult to say. The Sonatas do use different designs for their models. You are going to want to find one on a 2009-2010. If you...

Q: White smoke.

If you are not having any loss of coolant in the system or any excessive oil consumption, then the exhaust may emit a small amount of white smoke from the exhaust. The smoke is a small amount of moisture that...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.