oil pressure gauge is stil acting up

2003 CHEVROLET TRAILBLAZER
190,000 MILES
Avatar
ANONYMOUS
  • MEMBER
  • 1 POST
I replaced my oil sending unit, filter and oil and the oil pressure gauge is still acting up. It is going from 40 to zero and then to 20 then to zero. Then, the stop engine light comes on at zero. So, if it is not the oil sending unit then what could the problem be?
Thank you. Scott Rountree, Virginia
Jan 2, 2013 at 6:30 PM
Advertisement
Avatar
SQM
  • CAR REPAIR CONTRIBUTOR
  • 6,383 POSTS
Hello,

Have you made sure that there is adequate oil pressure when the engine is running?
You can check the oil pressure using a pressure gauge.
As you have new sensor, the issue could be a faulty wiring that is triggering the incorrect reading at the gauge.
It could be also due to having faulty oil pump, that is not producing appropriate oil pressure.
Test the oil pressure. This engine should have 12 PSI pressure at 12000 RPM.

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Sep 30, 2021 at 11:31 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.