1999 Chevy S-10 oil pump?

1999 CHEVROLET S-10
79,000 MILES • 6 CYL • 2WD • AUTOMATIC
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DARYL FERGUSON
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  • 1 POST
When I start my truck there is a clacking noise that sounds like my lifters. I tried a quart of tranny fluid and it still makes the same nouse. After the truck has been running for a few minutes it will go away. I'm wondering if it is my oil pump? Also, all my lights flicker in the cab and the head lights. What can cause that?
Dec 23, 2009 at 12:20 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Oil pumps do fail, but it is rare. Start by checking the oil pressure with a mechanical gauge. You want minumum of 10psi at idle on hot engine (20psi would be better).

You most likely have a bad lifter or oil starved lifter, which could be caused by the pump, or excessive sludge buildup in oil galleys.

The flichering is usually an intermittent open circuit.
Go to any autoparts store and have the charging system rtested.
Dec 25, 2009 at 1:12 AM
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