Question about 1998 GMC Sierra
During Eng start up oil pressure very low almost zero with nicking noise oil pressure will increase if Eng speed increase suspect oil pump
CHECK THE OIL PUMP SUMP TUBE O-RING. THEY COLLAPSE CAUSING THE OIL PUMP TO PULL AIR INSTEAD OF OIL. TO VERIFY OVER FILL ENGINE OIL AND CHECK ENGINE OIL PRESSURE. THIS IS A COMMON PROBLEM ON ALL NEWER GM V-8 ENGINES : 4.8 5.3 5.7 6.0
Posted on Dec 24, 2009
It could be the oil pump, worn bearings,bad sending unit or gauge. First try a higher viscosity oil 10W40 winter 20W50 summer and a good oil filter with a anti drainback valve (don't buy Fram). The clicking is from the lack of oil to the hydraulic lifters and the anti drainback valve oil filter should help solve this problem.
Posted on Feb 21, 2009
2003 GMC 6.0 CHANGED LEAKING OIL LINES, FILTER, ETC. HAD OIL PRESSURE FOR ABOUT 2HRS WHEN LOW OIL LIGHT CAME ON AND OIL PRESSURE DROPPED TO ZERO,INSTALLED OIL GAUGE CONFIRMED NO PRESSURE, PRIMED OIL SYSTEM STILL NO OIL PRESSURE, REMOVED OIL PUMP AND SEAL , SEAL VERY SPONGY ? ? REPACED OIL PUMP AND SEAL ALL GOOD NO LIFTER NOISES AND PRESSURE AT 55 PSI, I HOPE TO GOD THIS NEVER HAPPENS AGAIN JUST BY DOING PREVENTIVE MAINTANCE ! !
Posted on Jul 10, 2012
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