Oil pressure drops at idle

Asked by 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.

1 Answer

118,245

Sounds like the bypass valve is sticky when cold, it dumps all the pressure until it warms up enough to start operating properly, yes I would change the oil pump assembly.

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