1993 GMC Sierra



October, 26, 2009 AT 6:59 PM

1993 GMC Sierra V8 Four Wheel Drive Automatic

i have a 1993 gmc sierra z71 with a 5.7L engine. Engine was replaced with a used one. My question is that " Why does my oil pressure drop down to 0 KPA after it has been running for a few minutes, but pressure is normal when the engine is cold? I replaced the oil pressure switch and my engine was running fine for about a week, now when the engine heats up the gauge on the dash drops to 0 kpa.

1 Answer



October, 26, 2009 AT 7:09 PM

Confirm the oil pressure with a mechanical gauge -if normal could be a faulty oil pressure switch abnormal could be oil pump or engine bearings. Try doing an engine flush

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