Noise Under the Hood Croce's Transmission Specialists Blog

Noise Under The Hood

When drivers hear unusual or excessive noise coming from under the hoods of their vehicles, it may be indicative of an engine problem.

If a clicking or tapping noise is heard that gets louder as the engine is revved, it may be an upper valve train ("tappet") noise caused by

  • low oil pressure
  • excessive valve lash
  • worn or damaged parts

This should prompt a check of the dipstick to see if the engine oil is low. If it is, oil should be added.

If the engine is still noisy, a worn or damaged oil pump, a clogged oil pump pickup screen, or a plugged oil filter may be preventing normal oil pressure from reaching the upper valve train components.

TIP: Using motor oil with too thick a viscosity during cold weather can also slow down the flow of oil to the upper valve train, causing noise and wear.

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Written by Developer Autoshop