Question about 1999 GMC Suburban

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Low oil pressure after engine warms.....

I get a drop in my oil pressure when my engine warms. Engine does not knock but has a slight change in idle only at stops, not when in park. Besides this engine runs just fine. Was told by dealer that motor was rebuilt recently. Truck is a 1999 yukon.

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  • Clint Smock
    Clint Smock May 11, 2010

    How low does the pressure get?

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A 1999 Yukon DOES NOT have a vacuum advance. It is computer controlled timing. Low oil pressure is the result of some or all of the following : worn oil pump, worn cam bearings, worn crank bearings. Oil pressure also normally drops as engine warms because the viscosity of the oil changes with temperature.

Posted on Feb 23, 2010

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When your engine is warming up there is a vaccume advance that reves the motor up slightly so it will warm it up quicker. I would look for a vaccum leak. and check the PCV valve it is usually located comming out of the top of the valve cover it usually is in the shape of an "L" fat side towards the valve cover and a hose will connect it to the air intake just before the throttle body it is about 1 in long 1/2 inch wide. and when you take it out and shake it it should make a clacking noise if not it is bad. replace it. Really cheap. I would bet on a vaccum leak. if the oil light does not come on I would not worry too much. but if it does shut your car off emiditally. it is telling it is not getting enough oil. It is the life of you motor. never run it with the oil light on.

Posted on Jun 22, 2009

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Oil thins when warm is normal good for concern but sounds like your just fine!!!

Posted on Jun 22, 2009

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