Skip the auto shop - Our mechanics make house calls

Q: What will cause a motor to knock?

asked by on

How do I fix this knocking noise?

My car has 18000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Engine knock is typically caused by excessive clearance in the lower engine bearings (rod and main). Of course, to know for certain, a professional would need to listen to the noise firsthand. Spark knock, which is the result of abnormal combustion, can also result in a knocking or pinging noise. Loose torque converter bolts or a cracked flex plate can also do the same. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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: Car making whining noise and leaking power steering fluid.

A whining noise while turning the wheel could certainly be caused by low power steering fluid. Air being sucked through the power steering pump is what causes the whining noise. I would suggest that you ask for help from a...

Q: How do I power adjust the driver’s seat?

If your vehicle comes equipped with a power driver’s seat, then you can adjust your seat in three different ways, all by using the power driver’s seat lever, which is located on the side of the seat. To move...

Q: Tires are turned in vibrate when started stops while driving

Hello there. The most common causes of a tire vibration are the inflation levels, tire balance, damaged wheel or tire or an alignment issue. With your car only having 1 mile on it, I would suspect that the tire...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.