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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Strong odor of fuel, black smoke on take off, and rough running

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: Converting manual transmission to automatic

In order to do this swap, you will need to have the powertrain control module(PCM) from the vehicle that has the manual transmission. The PCM from your automatic transmission truck will likely not work when the manual transmission is installed....

Q: Car self-accelerates intermittently

Hello. The odor of oil is merely coincidental to the symptoms you report. Any vehicle of that vintage is going to have multiple oil leaks unless the engine has been re-sealed or re-built. Just be sure the leak is not...

Q: 1994 Chevrolet Silverado extended cabV-8 oil pan gasket replacement?

Hi there. You would have to drain the engine oil out of the oil pan, put the plug back in the oil pan, and remove the oil pan bolts to take the pan off. Once the pan is off, you...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...