Skip the auto shop - Our mechanics make house calls

Q: what could make my car have a knocking noise?

asked by on

My car has a really bad knocking noise in motor. It will still crank and run just has a really bad knock. I've already took valve covers off to check if it was a rocker arm and it wasn't so what could be my problem? I'm hoping it isn't a slung rod but I've been told it wouldn't crank and run if it was a slung rod. So any information would be greatly appreciated.

My car has 180000 miles.
My car has a manual transmission.

A: A loud knock inside the engine could be cau...

A loud knock inside the engine could be caused by a broken piston, bent rod, or any of several other possible causes. Just about any loud knock that is definitely coming from inside the engine block is not good. It would probably be best to have a certified mechanic take a look at the vehicle, as they will probably want to pull the oil pan to do an inspection. There are a few problems that can sound like they are coming from the engine, but may actually be something else, like a flywheel problem. Either way, you will probably want to consult a mechanic for their opinion. YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location for this repair. YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location to have your engine inspected.

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・Save up to 30%

Get a quote

What others are asking

Q: Car overheating.

Hi there. The check engine light on this vehicle can turn on from the engine running too cold and too hot. If the coolant level was low from the beginning then the system should have been pressure tested to identify...

Q: right side steering pulls to the right

From what you described about your 2000 Ford Focus, you may have a bad tie rod end or a bad tire. Have the front end inspected and checked for damage. A vibration is most likely a tire or bearing, and...

Q: Engine knocking noise in 2003 Honda Civic

A knocking noise is never a good sign on an engine. If the sound appears once, then the engine is started and gets louder when you rev the engine then it may be a rod knock meaning that the engine...

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...
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...