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GMC Forum: No oil pressure after engine warms up at idle
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Old 01-14-2018, 11:43 PM
Whouck Whouck is offline
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Default No oil pressure after engine warms up at idle

I know this is an old topic but I just purchased an 07 Denali 6.2. Just replaced oil pressure sensor,oil pump,the o ring was torn so replaced, timing set,water pump and it still warms up and gauge reads no oil pressure at idle. No noise purrs like a kitten. Any help would be greatly appreciated.
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Old 01-21-2018, 04:40 PM
Daddio Daddio is offline
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Drives a 2014 GMC Yukon, 2005 Lincoln LS, Massey Ferguson 165, 1956 Thunderbird, 1959 Cadillac Biarritz
Join Date: May 2017
Location: Prince Edward County, So Ont
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This could be life ending for your engine if there truly is no/low oil pressure!! I'd get a known accurate analog pressure gauge and verify (briefly, don't run it long) if there is oil pressure. It sounds like you did everything... and more ... to correct the issue, but the new sensor could be defective.
I remember years ago, people complained of idiot lights showing low pressure which turned out to be due to 0W30 synthetic oil. I guess it didn't register it correctly, but there really wasn't any concern. I like a gauge. Good luck.
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Old 02-11-2018, 11:37 PM
Paul Sebesta Paul Sebesta is offline
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Default Default No oil pressure after engine warms up at idle

Since you state that there is no noise (that would be typical of low oil pressure) I recommend that you install a manual Oil Pressure Gauge at either the oil filter housing which requires an adapter or install the gauge directly in the threaded port where the oil pressure sending unit is located. Based on OEM Service Information, you should have approximately 1 psi per 100 RPM's however, typically the "normal" pressure is around 20-25+ at idle. If the pressure is withing normal range, then your issue is most likely the sending unit and/or a clogged screen that is in the bore just below the sending unit. If that screen gets clogged, which is VERY common, the oil pressure will not get to the sending unit and in turn causes a low pressure reading. If you find that the screen is in fact clogged, crank the engine with the screen and sending unit removed to flush the oil passage out. Be careful though and understand that oil will shoot out and make a mess of the area. If the screen is free of debris, replace the sending unit and retest. I hope this information helps.
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