Q: Car stopped accelerating and started smoking while driving on the highway

asked by on

Car stopped accelerating and started smoking while driving on the highway

My car has 125000 miles.
My car has an automatic transmission.

Hi There, It depends on the color of the smoke you are referring to as the color of the smoke will mean a few different things. White smoke indicates that you may have an internal engine problem, such as a head gasket leaking coolant into a cylinder. Black smoke coming from the exhaust is usually an indication of a rich fuel condition. When this happens, this can be the result of many things such as faulty fuel injectors, a failing mass air flow sensor or a faulty fuel pressure regulator allowing too much fuel to be supplied to the combustion chamber to be burnt. When this happens the result is an excess amount of unburnt fuel being passed through the exhaust coming out in the form of black smoke. Blue smoke coming from your exhaust generally means that the motor is burning the engine oil. This can happen for a couple of different reasons such as worn piston rings or leaking valve guide seals. When this happens, the engine oil is burned in the combustion chamber along with the fuel which is what generates the blue smoke coming from the exhaust. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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. Car stopped accelerating and started smoking while driving on the highway

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: Hi. I have a question about brake/rotor replacement on my 2005 Honda Element.

The front and rear brake pads are a different part and should not be rotated even if they were the same. This is the first time I have heard anyone say this in my 35 years as a master mechanic....

Q: Is a transmission mount the same as an engine mount?

Hello, Engine mounts and transmission mounts are distinctly different components, although they both serve to achieve the same purpose which is to prevent excessive vibration. Engine mounts are more substantial in nature as they are designed to absorb vibration more...

Q: When I accelerate to engage the next gear I hear a knock sound from the engine

Hi there. Knocking noise from the engine is not good. Assuming, it is the engine knocking. A heavy consistent knock could be a connecting rod. A hollow knock (louder cold and quieter warm) could be a piston. Metal contamination in...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...