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1995 GMC Sierra z71 oil pressure dropped- need advice on this

I just changed the oil on my 1995 GMC z71, 305 engine, 2wheel/4wheel drive. While pulling a loaded trailer I noticed that the oil pressure was on 40, when idling it was on 20. I checked the oil level and it was fine. This model has an on-board computer so is it the oil pump or the sensor that needs to be replaced and how do I tell? Where is the oil pump and how easy will it be to replace it myself? Thanks.

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  • yadayada
    yadayada May 11, 2010

    20 IS NORMAL RANGE OIL PRESSURE. THE COMPUTER HAS NOTHING TO DUE WITH OIL PRESSURE.

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The oil pump is in the oil pan and needs to be dropped and being a 4WD you also need to drop the front axle pumpkin to remove the oil pan and replace all the gasket needed. Start with the easy and replace the oil pressure sending unit, it's on the back of the engine to the passenger side of the distributor. You can go to Auto Zone and pick up a new Oil sending unit, just make sure your get the right one, "Sending Unit" Looks the same are the oil pressure sensor but the unit reads the pressure, the other just signal a light to go on and off. It's an easy fix like replacing a spark plug. 

Posted on Jun 29, 2009

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