Higher oil pressure
I have a 07 GMC Yukon that always ran fine today I
had been driving for about a hour when the oil
pressure went up to 65 it has always ran 40-50
when driving and it always idles around 20-30 also
when I turn the engine off and turn key back on oil
pressure gauge shows 20 without the engine
running I was wondering what would be the
problem and if it's leading to something else thank
you for your help.
That sounds like the oil pressure sending unit is starting to go out. If you want you could install a manual gauge temporarily and watch the oil pressure as you drive, that would tell you if the oil pressure is actually bouncing around, if it is then you may have to replace the oil pump.
The gauge shows a steady 60. when I letoff of it iidles at 40 I was thinking it might be the sending unit but i wasn't for sure it's got 170,000 and has never really had any problems beside the oil composition problem that they all seem to have t
Would the sending unit cause it to show theirs pressure in the gauge with the engine off?
No that woul most likely be the little stepper motor for the gauge, they also fail a lot, you can get them on E-bay and replace them yourself, videos on you tube. If you do replace the sender make sure the little screen just below it clean, there have been some problems with those too. HTH
Yes that is a must on cleaning the screen under the oil pressure sending unit. 2007 is when GM started putting that in and do get clogged up causing a false oil pressure reading. Still replace the oil sending unit.
I agree with Rowefast, replace the sender and clean the screen.
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