Skip the auto shop - Our mechanics make house calls

Q: Loud knocking from engine area

asked by on

The vehicle has a loud knocking sound coming from the engine area.

Loud knocking sounds from the engine are often a sign of catastrophic failure, but not in every case. Inspect the engine oil level, and look for metallic flakes floating within the oil. Worn or broken parts along the engines belt drive system can also cause very loud noises in the engine bay. Have a trained mechanic inspect the engine compartment and verify which component is causing the noise.

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: Load on truck's engine causes loud knocking noise

Hello. It sounds like there may be a problem with the piston or the valves in cylinder 5. Loose rod bearings to the piston can cause a knocking noise and/or a misfire condition. A worn out piston can also cause...

Q: No palus to injectors

Hi there. If you are not getting a power indicator from a probe to a specific fuel injector, there are usually two reasons. First, the wiring harness connected to it is damaged or two, the connection to the engine control...

Q: Stalling dying misfires

These issues may be related. The battery is basically just an electronic storage device which must be charged regularly by the alternator. A good battery that doesn't stay charged points to a failing alternator. A bad alternator can also cause...

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...
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...