Skip the auto shop - Our mechanics make house calls

Q: When accelerating, the sound is different

asked by on

When accilerate car at slow race the car exhaust make different noises and black smoke. Is it becomes of bad spark plugs?

My car has 10 miles.
My car has a manual transmission.

Hi there. 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. The noise issue might be related to an exhaust leak. To know for sure, you should have a professional mechanic from YourMechanic complete a smoke from engine inspection so they can pinpoint the source of your issues and recommend the right repairs be completed.

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: Car starts bucking/jerking when letting off gas on the highway

This is very likely a throttle issue. There is an idle control module (or similar setup depending on your make and model) that is located on the throttle body which helps the gas regulation during these moments. Otherwise, without a...

Q: Car shudders and hesitates when accelerating from a stop

This may be related to a few different things, such as low fuel pressure or a bad mass air flow sensor. Low fuel pressure may cause the car to shudder if it is starving for fuel when trying to accelerate....

Q: After an Auto shop repaired my 2002 monte carlo ls 3.4L exaust manifold gasket and a tune up, ever since car hasnt been running?

Hello, thank you for writing in. Unfortunately your situation is going to require a second mechanic to inspect the vehicle. The biggest issue concerns the "tune up", as we do not know exactly what they did during that process. Tune...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...