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1999 GMC Sierra Clicking until engine is warm

Tiny
SCOTTYK
  • MEMBER
  • 1999 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
When I first start the truck, there a loud clicikng that persists until the engine warms up. The clicking is slower when the engine is idling and faster a you rev the engine or accelerate. Once the engine warms up it goes away.
Saturday, March 8th, 2008 AT 11:19 PM

1 Reply

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Your engine has hydraulic roller lifters. Hydraulic lifters need oil in them to work. When they get older they tend to bleed down or drain out the oil stored in them. You have either a few bad lifters or a weak oil pump.
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Sunday, March 9th, 2008 AT 12:20 PM

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