Skip the auto shop - Our mechanics make house calls

Q: Black smoke coming out from exhaust and it wont accelerate, there is no power

asked by on

my car is running for half an hour and suddenly black smoke coming out from exhaust and when I accelerate there is no more power it wont accelerate anymore.

My car has 155345 miles.
My car has an automatic transmission.

A: The black smoke indicates you have a rich f...

The black smoke indicates you have a rich fuel condition happening in your fuel intake system. This means that the fuel being supplied to the motor is too much in relation to the air supplied creating an imbalanced air/fuel ratio being supplied to the motor. When this happens, you may notice a fuel smell and a lack of power as you describe. This can happen for a few different reasons such as a faulty mass air flow sensor, leaking or dirty fuel injectors and many others. I would recommend having an expert form YourMechanic come to your location to diagnose your vehicle’s running condition.

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: BMW 330d Rattling-Hissing Sound from exhaust side

Hey there. Thanks for writing in today about the rattling / hissing sound coming from your 2004 BMW. I experienced a similar issue and it was in fact a vacuum leak. However, there are several other symptoms of a vacuum...

Q: Fuel pump won't energize

Hi and thanks for contacting YourMechanic. Either you have the wrong fuel pump for the vehicle or the circuits to the fuel pump are shorted together and causing an issue with the fuel indicator an pump. The pump should have...

Q: A/C stopped working

I would suggest checking the flap vents inside your vehicle's air conditioning ducts. These vents open and close the direction of air flow. If the rear vents are working correctly, then it is likely not the A/C compressor or blower...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...