Question about 1999 GMC Sierra
I drove 200 miles problem free turn the truck off for an hour went out and started the truck my oil pressure climbed over 550 kpa and engine began knocking I have changed the oil filter and oil but the problem remains the same. Anyone have any ideas about this one?
There is a pressure relief valve in the oil pump, it is stuck closed, this happens now and then, seen it 2 times, since the oil pump is a positive displacement pump it can produce 100's of pounds of pressure, the reason for the noise is that u have allot OF pressure but very little volume, the bearings are being starved for lubrication, replace the oil pump, DO NOT DRIVE THE TRUCK, U WILL BURN OUT THE ROD AND CRANK BEARINGS.
Posted on Dec 10, 2008
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Posted on Jan 02, 2017
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