Skip the auto shop - Our mechanics make house calls

Q: Loud sound punching vibration

asked by on

When I start my car from a cold start or warm start the engine makes a loud automated sound that stops almost immediately. It doesn't sound like screeching but it’s not normal. When I lightly hold the brake pedal with my hands I can feel the engine's pistons firing or punching through the pedal – no specific pattern only a vibration or punch that’s not normal. Could it be the intake gasket or engine bearing? What do you think?

A: Hello there, thank you for asking about you...

Hello there, thank you for asking about your 2013 Mercedes-Benz C63 AMG. Since you are feeling this through the brake pedal, your symptoms are leading me to believe you are experiencing the vehicle's anti-lock braking system self-test at the beginning of the ignition cycle. These vehicles are usually pretty sensitive when it comes to problems concerning the engine and if no light is illuminated, I would consult your certified dealer about the noise to see if something has come loose or a noise damper has become worn. You can also have a technician from YourMechanic come to your home or office to inspect the vibrations in your brake pedal.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Problems with hardtop and back window.

It sounds like there may be a problem with your switches that activate your top and back windows. It is rare for two window motors to go bad at the same time so that is making me think that the...

Q: Stalling when slowing down, jerking, sluggish engine

You may have a fuel pump or fuel pressure regulator issue. All of the symptoms you described are possible with a faulty fuel pump. However, the more likely cause in this situation would be the fuel pressure regulator. The...

Q: Opinion on GM Northstar V8 engines

I don't think much of them. Those things blew head gaskets and it sometimes costs 5-8,000 dollars to repair them. It's a racing engine. It's fine for race cars but for cars that people drive every day, it's overkill and...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...