1992 GMC C2500 High Oil Pressure

GMC C2500
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KRAMDOG
  • MEMBER
  • 2 POSTS
I have a 92 2500 series GMC truck. When I first start vehicle cold, the oil pressure gage is pined all the way up. After it warms up, the gage reads normal till I excede a certain rpm then it pins high again. Also I am starting to get some seepage of oil from rear seal. Could there be a problem with the pump?
Feb 22, 2007 at 6:05 AM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
excessive crankcase pressure is one culprit, ie: pcv blocked, if you have a way to do it i would do a manual oil pressure test if it checks out ok check the oil pressure sensor , the leak may not be related if the pressure is correct
Feb 22, 2007 at 6:12 AM

Suggested Repair

Check for a blocked PCV valve that can cause excessive crankcase pressure. Perform a manual oil pressure test; if the reading is normal, inspect the oil pressure sensor. The rear seal seepage may be unrelated if actual oil pressure is correct.

Conversation Summary

A 1992 GMC 2500-series truck shows oil pressure pinned high on a cold start and again above a certain RPM after warmup, with some rear seal seepage. The owner asked whether the oil pump could be at fault. The expert suggested checking for excessive crankcase pressure from a blocked PCV, verifying pressure with a manual gauge, and then checking the oil pressure sensor if the test is normal. The leak may not be related if pressure is correct.

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