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?

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

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: Stalling, transmission stuck in first gear

Hi. That can be so frustrating to have your car stall when you expect it to go! It is usually caused by an interruption in the delivery of fuel or spark. Technicians use diagnostic tests depending on the symptoms to...

Q: Chirping rattling noise hood

The tensioner pulley is near the top center of the engine. It is easy to spot as the back of the belt rides on the tensioner pulley and not the ribbed side. Removing the belt to access the pulley...

Q: Car runs hot and leaks

The cooling system on these vehicles are known to leak from the head gaskets as the vehicle ages and the cooling system fluid becomes acidic to the point that it starts damaging metal parts of the aluminum heads and starts...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...