Question about 2003 GMC Envoy Xl

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03 gmc envoy with 5.3 140000 miles. Oil pressure reading fluxuates between 0 and 40. When problem first started pressure read 80. When vehicle was new it stayed at midpoint (40) vehicle has plenty of oil. if you rev engine or increase rpms it goes to 0 and stayes there. let off and it jumps around like it did when started (0 to 40). No engine pecks while running. Display indicates low oil pressure and stop engine. orange light (check gages) comes on when at 0. any ideas. Service engine has not come on. thanks for any help

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There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.

Posted on Oct 02, 2009

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Possible the oil sending unit is bad. If the engine isnt making noises (it would by now if you kept driving it like that) the most likely the sending unit is "lying" and everything is OK. I would replace the sending unit and see if everything comes back to normal.

Posted on Oct 02, 2009

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When I fuel up my oil pressure goes up i.e. 1/2 tank of fuel over 80 on the oil guage at same time fuel consumption goes up drasticaly


Adding fuel to the fuel tank is absolutely unrelated to to any change in engine oil pressure.
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If you are experiencing abnormally high oil pressure on start up I suspect you are running the incorrect type and grade of oil in the engine. Only use the oil specification(type and grade) listed by the manufacturer for your engine and nothing else.. If you are unsure what that is then it is specified in your owners manual for the vehicle.

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Low oil pressure/ guage fluxuates but runs low


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Oil pressure gauge goes to 80 and stays


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How do I check and possibly replace the engine oil pressure sensor in a 2006 GMC Envoy Denali?


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  2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
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4 Answers

Oil pressure reading in 2003 gmc envoy


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Good luck and hope this helps. You can pick up the sending unit at Auto Zone and most auto parts store and will have the step by step to replacing it. If you do attempt to replace it. make sure you DO NOT USE any Teflon tape or silicon on the threads, they are tapered and need a good ground to the engine for proper readings.

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Sounds like an oil pressure sensor. Here is a diagram to locate it for removal. Best of luck.
Greg

http://www.chiltonlibrary.com/content/images/21202/images/21202_GDIA_g518.pdf

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That is probably a defective oil pressure gauge or a broken oil pressure sender, it reads 80 psi just because that is the maximum value allowed.

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If instead the gauge reads 80 with engine off, that is a defective pressure gauge.

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