Skip the auto shop - Our mechanics make house calls

Q: Knocking noise from engine and oil seems to be full? Loud and constant what could it be?

asked by on

My engine started knocking last night at big speeds it was not loud but when sitting or parked it became loud again. The oil dipstick displayed full it was checked before the car was turned on. What can this be and could it be expensive to fix?

My car has 105800 miles.
My car has an automatic transmission.

Hello, thank you for writing in. Engine knock can be caused by several different issues. Even with the oil full, if it is not being sent to the places in the engine that need it. Low oil pressure can be caused by a clogged line, a bad pump, or a clogged filter. The low oil pressure would rob the engine of the oil it needs and produce a knocking sound. The oil pressure can be tested with a gauge. If the issue is mechanical, it may be a piston or valve issue. There are engine timing components that will knock and cause issues when they are misaligned or have failed. Further testing must be done. For more help with resolving the noise, contact our service department.

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!
  • Home
  • Questions
  • Knocking noise from engine and oil seems to be full? Loud and constant what could it be?

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: My car steering pulls and turns

Since you've only supplied the year of your car there is not much information for me to go on. For example, you may have electric steering or standard steering. You may have lane change assist or other possible options that...

Q: Brake lights

If you did not check the bulbs themselves before changing the brake light switch, you might want to start there. Blown brake light bulbs can actually cause the ESC light to come on, so make sure that the bulbs are...

Q: How do I use the sunglasses holder?

The sunglasses holder is located in the ceiling console, and can store a pair of sunglasses so that they are easily accessible when driving. To open the sunglasses holder, press the compartment in until it releases and opens. To close...

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...
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...