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Slight knock on cold start?

Tiny
BADGEDBROTHER
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 202,000 MILES
I am having a small knocking sound that's noticeable to me but faint. It goes away after a couple minutes or once the engine is brought up over 1500 RPMs for a couple seconds then the sounds goes away until the motor sits overnight. I think it might be a lifter draining and once it refills its fine. Just wanted to know your opinion on if it could cause major engine issues since I have a long trip next week and this just started.
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Friday, September 8th, 2023 AT 8:37 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
Hi,

If it goes away that quickly, certainly it could be a lifter issue. If you are barely able to hear it, I personally wouldn't be too concerned. Just make sure the engine oil remains clean and full. Keep in mind, based on the mileage, it could also be a bearing that is wearing. As the engine heats up, the metal components expand allowing the sound to stop.

Other than low oil pressure and based on your description, I wouldn't be overly concerned.

Let me know if that helps or if you have other questions.

Take care,

joe
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Friday, September 8th, 2023 AT 9:57 PM

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