Skip the auto shop - Our mechanics make house calls

Q: Strong odor of fuel, black smoke on take off, and rough running

asked by on

Rough running strong odor of fuel black smoke on take off feels like a motor or trans mount broke but is not

My car has 350000 miles.

A: Hey there. The rough running condition is d...

Hey there. The rough running condition is definitely related to the black smoke and fuel smell which indicates the motor is running rich or being supplied with too much fuel. This can happen for a variety of reasons such as leaking fuel injectors which may leak more fuel into the motor than it can effectively burn. This can also happen when the mass air flow sensor is dirty or malfunctioning causing it to send incorrect signals to the computer which then makes incorrect fueling adjustments. When the oxygen sensors (O2 sensors) are faulty, this can also cause them to send inaccurate signals to the computer which can make incorrect adjustments to fueling causing this kind of condition. I would recommend having a professional from YourMechanic come to your location to properly diagnose your rough running condition so that this can be repaired correctly.

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: Possible gas leak in car

The Check Engine Light will not come on due to a gas leak. It will only come on when any electronic issues occur with the engine such as a failed sensor or ignition component. If it was leaking fuel only...

Q: Several warning lights came on and the car is overheated, making a weird noise, and giving off a bad smell after being jump started.

There are a few possibilities with the symptoms you are having. The most common with what you have described is you may have attached the jumper cables incorrectly. This could cause a number of issues including the symptoms you are...

Q: It sputters bad when i hit the gas pedal to hard and want to die

When an engine is cold, it needs to have rich fuel condition to run. Only when the engine has warmed up can it run at full power and efficiency. The thermostat not only keeps your motor from overheating, but it...

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...
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.