check gagues

1990 GMC C1500
285,000 MILES • V8 • 2WD • AUTOMATIC
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MNO221
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  • 49 POSTS
1990 gmc pu, my check gauges lite came on and my oil pressure is registering past 60. What can cause that.
Apr 5, 2011 at 6:28 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Past 60psi-could be the oil pressure relief valve not opening-check it with a mechanical gauge
Apr 5, 2011 at 7:23 PM
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MNO221
  • MEMBER
  • 49 POSTS
Thanks
Apr 5, 2011 at 9:50 PM
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MNO221
  • MEMBER
  • 49 POSTS
Is the oil pressure relief valve the same as the oil pressure switch,oreily only show a switch not valve?
Nov 14, 2011 at 8:44 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
No, the oil pressure relief valve is in the oil pump-the switch reads the pressure-the oil pressure relief valve controls the oil pressure
Nov 14, 2011 at 9:08 AM
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