Skip the auto shop - Our mechanics make house calls

Q: Knocking from the motor

asked by on

When I start my truck, there is a loud knock coming from the motor

My car has 182000 miles.
My car has an automatic transmission.

Hi. The usual cause of the loud knocking in these motors are one of two things (or both). The timing chain guides become loose or worn out and sometimes causes the engine to knock or tick when it is running. The other possible cause of your knock is there are worn out internal engine parts in the engine block. For example the piston bearings are worn-out, the crankshaft is worn-out, or the piston ring has broken or is worn out causing the noise. If the timing chain is the problem that can be fixed without replacing the engine. If you have any of the other parts that I mentioned causing the issue, then the engine will have to be replaced or rebuilt. A professional technician from YourMechanic can come to your car’s location to inspect the engine noise and advise you on the correct repairs.

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
  1. Home
  2. Questions
  3. Knocking from the motor

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 2001 ford expedition has been shaking over 65 mph ive changed the ball joints inner and outer ties rod ends brakes and rotor hu

The shocks may be worn out and when you get to the higher speeds there is a normal tire vibration from road surface and the shocks should keep the tires in contact with the road. Have shocks replaced if they...

Q: Check engine light flashing on &off&battery light flashing on &off also has a code of P0200 for injector circuit control and cylinder 5 misfire.

Hi there. Check the injectors and see if they are firing. The fuel injectors for the engine are one unit, so if the number 5 injector is not working and it needs to changed, then you will have to replace...

Q: Slow accelaration

Hi there. When you hear a loud air noise that is accompanied by lack of acceleration, it's typically caused by either a vacuum leak or exhaust leak. The vacuum leak will be due to a vacuum hose that is split...

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...
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...