Oil pressure drops at idle

Asked by Patsgrl Jul 24, 2017 at 02:27 PM about the 2005 Chevrolet Silverado 1500 LT Extended Cab LB 4WD

Question type: Maintenance & Repair

I have a 2005 Chevy Silverado 5.3. Changed the oil
(5w30) and filter. When I first start driving, the oil
pressure falls in idle to almost nothing, but after the
engine warms up, will maintain oil pressure at 35ish
in idle. While driving it stays above 40-50. Manual
gauge shows same readings, but like I said,
problem stops after engine warms up (which is just
strange.) Any thoughts, cause I'm about to change
the pump.

2 Answers
790

Chris answered 5 years ago

Had this same problem with my 08 Suburban LTZ. Cold start it would run at about 10psi and would immediately begin to drift down to 0psi. Long story short, we dropped the front axle and oil pan( which takes half the time of pulling the oil pump) and replaced the worn oring in about 5 hours. Now cold start idle produces 60psi and the same pressure at highway speeds once warm.

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