A lot of the switches are back in the back behind or close to the distributor.
SOURCE: low oil pressure
It is a plu located directly above your filter on the oil filter adapter housing.. its about 3 inches long with wires plugged into it.. takes a special little socket to remove it...10 dollars at auto stores for the socket...
SOURCE: low oil when engine warms up gmc sierra 1995
30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.
SOURCE: 2003 GMC Sierra Knock sensor and oil pressure??
the knock sensors are located below the intake plenum,or,upper intake manifold as some call it, they screw into the lower intake, the front one is sensor 1, the rear is sensor 2. it is wise to change both if you have some miles.since you are going to be buying a gasket set to do this job.the sensors are cheaper than the gaskets.
SOURCE: 1993 GMC Sierra C1500 5.7 just recently started
Most likely the Gage is not the problem these rarely go out. If the pressure is only dropping then the oil pump is getting weaker or is filling with sludge. Try running the engine with an oil additive such as marvel mystery oil or sea-foam. Then after the additive has circulated through the engine for a few heat ups and cool downs you can change your oil. the pressure should change almost immediately. If it doesn't then check the oil pressure switch. You can look on the side of the block and there will be a small piece shaped like a pencil with a wire coming from it. This piece is the oil pressure switch. Hope this helps. Please rate me if you think this helped. Good luck.
SOURCE: 1990 GMC Sierra lifters knocking. Oil pressure
I doubt it....It could be a totally worn out engine.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
314 views
Usually answered in minutes!
×