Can anyone tell me where on the stock oil pressure gauge located on the stock gauge cluster on a 91 with a 5.0 is the needle supposed to be when idlling and when moving. Right now it sits just above the “red” maker to the low end when idling and gets up to past the quarter marker when going down the road. If not correct probably will try replacing the oil pressure sender and see if that corrects it. Just got the van out on the road yesterday for the first time since trailering it home last October and drove it for about hours total (been working on it all winter and spring). Everything seems ok, seemed to run pretty well.
Thanks
Your about a 1/2 qt low ... maybe a clogged filter ...
Oil is full, changed it early this winter.and the filter.
My 91 G20 5.7L oil pressure gauge behaves similar to yours. Did changing the oil pressure sender make any difference?
Have not gottEn to that yet…..have had other house/property “stuph” pop up recently. Going to order the oli pressure gauge sender today as a matter of fact….thanks for the reminder…
My 91 G20 5.7L oil pressure gauge behaves similar to yours. Did changing the oil pressure sender make any difference?
My 91 G20 5.7L oil pressure gauge behaves similar to yours. Did changing the oil pressure sender make any difference?
Cold start it should peg the needle (60+ PSI) warm- almost 30+ Middle of gauge, hot- lucky to have it above 20. Don't judge your oil pressure at idle hot, kick up the throttle to a fast idle around 1000 rpm then look. The senders are mostly crap, they leak at the fitting and at the electrical connection. You can clean the connection and make sure it's tight. A little pinch with pliers will help and I mean little don't crush. when driving at a steady pace you should see a constant reading. Remember the van is old and GM sold cars in the mid 80's that were only ment to go 100k don't expect much, but they will last longer.
Best thing you could do is ditch the "dummy gauge" (without numbers) and install an aftermarket gauge with numbers, either digital or analog. Way more accurate than the sweep style gauges.