Skip the auto shop - Our mechanics make house calls

Q: Lifters and oil changed out, now notice a knocking sound.

asked by on

Had oil changed recently and the lifters replaced. I noticed an occasional knocking sound.

A knocking sound is not a good sound to have. It could happen in a number of places. It could either be in the valve train or could be a piston rod or crank bearing worn out. Either one is not good. I would recommend taking it to a mechanic and have them diagnose the noise. It could also be a piston slap, either one is going to take a complete rebuild of the engine to fix.

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: Low coolant light on, coolant level fine

The level sensor may be at fault giving off a false reading and having the car turn on the warning light. This is an electrical problem in the case that an electrical component has failed. I suggest hiring an automotive...

Q: Making a ticking noise as I drive and in park at idle

Without hearing the noise, it's impossible to say what it is, But I'm going to suggest that you may have a valve noise because that is a sound that most people describe as "ticking" It's is a regular sound that...

Q: Low compression cylinder 2 and 4

If the compression is below the minimum specified in the service manual, the mechanical (or head gasket) issue causing that will have to be resolved. Either the cylinders (2 and 4) are leaking through the head gasket, the valves or...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...