Losing oil pressure at idle

Tiny
FLYINGBUZ
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 195,000 MILES
I have a 2002 Trailblazer LTZ and the oil gauge just started randomly dropping to 0 when the engine is at idle speed. When I hit the accelerator, the pressure returns to normal. The "Check gauges" light and the "Stop Engine" computer message comes on when the pressure drops. Oil level is fine, Oil pressure has been checked and is OK. The oil sending unit has just been replaced. Still having the same issue.
Monday, September 12th, 2011 AT 6:24 PM

3 Replies

Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
What happen is the oil pick up screen becomes plugged causing the engine to loss oil pressure please remove the oil pan to confirm.

Check out the diagrams (Below)

Please let us know what you find.

Cheers
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Monday, September 12th, 2011 AT 6:49 PM
Tiny
FLYINGBUZ
  • MEMBER
  • 2 POSTS
Boy that was a job but Im glad I did it because the oil pan was full of sludge I cant believe the oil pump could work at all. I cleaned the pan out and the oil pump pick up and now it works great! Thanks for the tip and the diagrams I love this site.
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Monday, September 12th, 2011 AT 7:47 PM
Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers.
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Monday, September 12th, 2011 AT 7:55 PM

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