gauge shows oil pressure dropping

Asked by Jan 05, 2016 at 12:57 PM about the 2004 Chevrolet Silverado 1500 LS Extended Cab 4WD

Question type: Maintenance & Repair

40lbs at startup and 55lbs at 1700 rpm.  After about 45 mins of driving, bells start with warning message on dash, "low engine oil pressure", but no check engine light.  Stop and turn off the truck, count to five and restart to 40 lbs at idle(600 rpms)  and start the cycle again.  Any ideas?

7 Answers

85,325

Have you checked the oil level?

31,615

also change the sending unit...cant hurt..

Oil level is good, changed it yesterday to make sure nothing metallic in it. Have used Mobil 1 for a couple of years. Changed sending unit last night. Still had the same problem today. Let it run about a minute with bells going off with the hood up, no noise at all. Turn it off and start it right back up with 40 lbs at idle. Called dealer, gave them the vin and they said no filter screen under sending unit for this model.

85,325

Ya the screen I believe they started in 2006. No noises is a good sign, but I guess I would get a mechanical gauge and screw in there and actually check the oil pressure to be sure there is a problem.

85,325

Ah, I remember hearing something on these years, is that the 5.3L?

Yes 5.3L. Wondering about the bypass in the oil pump. It idled this morning for 45 minutes and stayed around 40lbs at idle(38 - 40) the whole time. and after driving for 25 minutes pressure started dropping. But like I said. Turned it off and started right back up to 40 lbs.

85,325

Ya that is one thing I have heard on those. Since it is predictable, I would throw a oil pressure gauge on it to verify.

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