Oil pressure dropping at idle......help!

[Robert.K]

2001 Tahoe, 5.3, almost 150,000 miles.

Symptoms: after a cold start my oil pressure drops to nothing sitting at idle. Goes back to normal when driving. Only last until engine warms up. Drops to zero, check oil pressure light comes on and a very loud tapping. No leaks, burns about a quart of oil a month, use royal purple synthetic.

Any help would be appreciated.

 

[04SS99Denali]

if your hearing a loud tapping when it drops id stop driving the truck NOW. probably failed oil pump

 

[Robert.K]

Yeah I have, but I was told by an salty mechanic that if it was my oil pump, that it would have seized by now. Been doing this off and on for about a month. Been riding my Harley until I could get it fix, but it's in the shop and now this is my transportation. You think it might be the oil pump sensor?

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[Gzes]

Its either the pumo ir the bearings. My bearings where out and it did that. It happened becahse my shit mechanic dry started it

 

[Robert.K]

Wow, that sucks. Well I guess it's bite the bullet time...

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[Dberdusco]

Gm bulletin for defective oring on oil pump pickup.... The symptoms are what you just described...

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