1999 GMC Sierra Clicking until engine is warm

1999 GMC SIERRA
150,000 MILES • V8 • 4WD • AUTOMATIC
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SCOTTYK
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  • 1 POST
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.
Mar 8, 2008 at 11:19 PM
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PEAR69
  • ✓ASE Certified Mechanic
  • 1,482 POSTS
  • ASE Certified Mechanic
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.
Mar 9, 2008 at 12:20 PM
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