Skip the auto shop - Our mechanics make house calls

Q: Knocking sound in the engine

asked by on

I can hear a knocking sound in the engine. Car cranks up and starts.

A knocking sound in the engine generally means that the bearings in the engine are worn. When the bearings are worn, this allows the parts of the engine to have excess movement, causing the knocking noise. I would ask for help from one of the mechanics at YourMechanic to diagnose what is causing the knocking noise in your engine, so they can recommend a repair.

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: At light or slowing down, car has irregular idling rev

Hello. Most of the time when this issue occurs, it is due to a faulty idle air control valve. This valve is responsible for letting some air from the air cleaner bypass the throttle body so that the engine can...

Q: Red Generator light and squeal at start. After stop, won't restart.

Before condemning the alternator, have the drive belt checked to see if it is loose from a stretched belt or worn belt tensioner. If the belt is loose and slipping on the alternator, the alternator will not be able to...

Q: I have a 99 acura that overheated but only driven a couple min after heating up now won't start

It is possible that your engine may have overheated to the point where it will no longer run. It does not take very long at all to destroy and engine if it is overheating. I would recommend to first check...

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 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...
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...