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how to test an oil pressure gauge?
'85 GMC S15 Sierra, 4WD, 2.8L. Oil pressure gauge pegged to the right since day 1. How do I test it outside the truck (power probe2, voltmeter, etc.) to see if it's bad or not? Then I need to do the same thing with the oil pressure sending unit, the fuse, wiring, etc.
Don't send me links to click on cuz i am not stupid enough to do that. Thank You.
got an answer from a mechanic just before the first reply. no, you don't replace the sending unit to test the gauge. you remove the wire from the sending unit and ground it to the engine. whether or not the needle moves on the gauge tells you whether the gauge is bad or the sending unit is bad.
lmao, that would be like opening the refrigerator door and the light doesn't come on so you buy a new fridge.... wow.
2 Answers
- 5 years ago
Did you test the oil pressure with a mechanical test gauge? It probably was not a good idea to put that agent in the engine, But it is VERY common problem on the jetta to have a plugged up oil pick-up screen (have seen many of them) to fix this you will have to remove the oil pan remove the screen and clean it out at the same time you can check to see if any damage was done to the engine by checking the Connecting rods (most of the time in a case like this you can see this without disassembly of the bearing caps by looking at the ends of the rods (the middle of the rods will look light to dark brown and the color should be consistent all the way up and down on the rod, if the end of the rod (around crankshaft) looks really dark or black the engine is pretty much done! @ country boy I think he meant that the test gauge didn't have any oil in it?
