The oil pressure drop indicates more problems.
Oil pressure drops to zero at idle on 2002 GMC Envoy after ...
www.fixya.com/cars/t7880379-oil_pressure_drops_zero_idle_2002_gmc Jan 18, 2011 - You could have three possable problems that I can think of. 1) Your oilviscosity is too low and you need to change it to a higher level. A 5w/30 .
Oil pressure drops to zero at idle on 2002 GMC Envoy...
Oil pressure drops to zero at idle...
SOURCE: Oil pressure suddenly dropped to zero.
Hello, let's see what you need.
Yes, the pump can go out that fast.
Do not start your engine. Go out and check the oil. If you have plenty of oil you will need to tow it to a shop. If your out of oil check the the drain plug on the oil pan and check the oil filter.
SOURCE: 1995 GMC Sierra z71 oil pressure dropped- need advice on this
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.
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