oil pressure too high - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-08-2008, 01:24 PM   #1
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Default oil pressure too high

the oil pressure needle is buried at 120 i replaced the switch still does it replaced switch again still does it 95 ssei thanks in advance
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Old 02-08-2008, 01:28 PM   #2
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Does the gauge do the full sweep when turning the key on, or does it peg itself immediately?
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Old 02-08-2008, 01:48 PM   #3
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Are you using the correct sensor? Rated for the gauge and PCM signal? Dual contact?

Or are you using the SE sensor? Have you had a mechanical gauge on there to see what it normally reads?
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Old 02-08-2008, 01:49 PM   #4
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ys the needle does do a full sweep up then down then it pegs itself all the way up
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Old 02-08-2008, 01:49 PM   #5
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Test it with a mechanical gauge where the oil sender screws in. If the mechanical gauge reads a lower, normal pressure, the problem is the sender or the dash gauge. If the mechanical gauge matches the dash gauge, (not likely), remove the oil pressure relief piston and spring from the oil filter adapter and check for a stuck closed problem.

[edit: three responses in two minutes - now, that'* service!]
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Old 02-08-2008, 01:58 PM   #6
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thanks i will give it a try and let you know what happens
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Old 02-08-2008, 03:01 PM   #7
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well i took off the oil filter adaptor cleaned it all out and the needle still pegs itself. do you think i should replace the instrument cluster?
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Old 02-08-2008, 03:17 PM   #8
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Not at all. The gauge can't peg itself without being told to.

Please put a mechanical gauge in place of the sender and tell us what it reads.
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