Oil Pressure - 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 01-13-2005, 11:20 PM   #1
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My oil pressure gauge is acting like a tach. As the rpm'* go up the oil pressure gauge rises to the max. Any ideas what would cause this?
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Old 01-14-2005, 12:12 AM   #2
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maybe the pressure relief valve is broke, or maybe the sending unit is bad...
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Old 01-14-2005, 01:32 AM   #3
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Quote:
Originally Posted by dblack1
maybe the pressure relief valve is broke, or maybe the sending unit is bad...
I'm going with a bad sending unit....Pontiac'* are notorious for bad senders.......And mine is acting the same way....but doesn't matter RPM'* at all.....It'* just all over the place.
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Old 01-14-2005, 02:50 AM   #4
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Hmmm. Is your engine new or rebuilt? How many miles on it? If it is a bad relief valve, you will be putting a lot of pressure on seals and parts that aren't made to withstand it. If something pops, you could lose all your oil in a really short time. You need to make sure what'* going on here so you don't suffer some really expensive damage when a cheap fix could have made things right. Checking, replacing the relief valve, I don't think, is a very difficult job.
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Old 01-14-2005, 05:55 PM   #5
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Quote:
Originally Posted by bill buttermore
Hmmm. Is your engine new or rebuilt? How many miles on it? If it is a bad relief valve, you will be putting a lot of pressure on seals and parts that aren't made to withstand it. If something pops, you could lose all your oil in a really short time. You need to make sure what'* going on here so you don't suffer some really expensive damage when a cheap fix could have made things right. Checking, replacing the relief valve, I don't think, is a very difficult job.
Its not, probably 15min. IIRC you don't even have to pull the oil filter. Here'* how I did it, I might have forgot a step though:

1. Raise car
2. Remove passenger side tire
3. Remove splash guard
4. Remove oil pressure sending unit
5. Remove 4 (IIRC) bolts holding the oil filter housing to block
6. Carefully pull housing away from block. A metal plunger and spring will come out.
7. Tada

Prolly need to throw a "Disconnect oil cooler lines" in there too.

The symptoms go exactly with what a stuck relief valve would indicate, although the probability definately leans to the sensor.
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Old 01-14-2005, 09:05 PM   #6
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Thanks everyone for your help. I will replace the sending unit first and go from there.

I will keep you all posted.

Thanks again!
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