Question about 1999 GMC Jimmy

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The oil pressure guage showed max. then while driving it went back to normal setting,thenwent right to 0 with oil dropping out of engine immediately,what would you consider this problem being,a front seal or oil pan ?

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Unless you see an oil leak from the pan ends or balancer seal, neither have much to do with oil pressure except for that if a sufficient quantity of oil leaks out the level will go low and you then can loose pressure. What I'd be looking at is the oil pressure sending unit, especially if the engine is quiet when running (no tapping or knocking). The sender should be near the oil filter pad on the block. But they keep moving it around so you may need to look further. Technically, it's best to verify actual pressure using a screw in test gauge, but if you don't have one, just replace the sender and see if it helps. If you are loosing oil from the sender, definitely replace it asap. As for leaks from other places, you need to actually look and see what the source is before you can plan a repair.

Posted on May 29, 2011

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