Oil pressure 120psi - is that bad? 94 Bonneville - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-22-2006, 09:58 PM   #1
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Default Oil pressure 120psi - is that bad? 94 Bonneville

Hello, I just had the motor replaced in my 1994 Bonneville, and now the oil pressure is pegged at 120psi, and doesn't come down at all when the car is warmed up. Is this bad? What could it be?

Thanks in advance for your help.
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Old 11-22-2006, 10:00 PM   #2
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Bad oil pressure sender? Any chance of getting a mechanical oil pressure gage on there?
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Old 11-22-2006, 10:08 PM   #3
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The new motor may have the wrong style sending unit.
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Old 11-23-2006, 01:26 AM   #4
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Pretty common, should be a bad sensor.
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Old 11-23-2006, 12:10 PM   #5
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I'll go with the bad sensor on this one. 99% of the time, that'* the issue with high pressure. It'* easy and cheap enough with those odds to just replace it. It'* sticking out the back side of the engine on the passenger side just above the oil filter adapter.
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Old 11-30-2006, 08:30 PM   #6
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my 96 SSE had this all the time. Changed the sensor. Still did it. After a real good oil system clean took care of the problem. I don't remember what the guy did but, man, did it help.

P.*. your pressure never really actually will get to 120 psi. It'* like the fuel gauges on just about every GM I've owned except the two bonnies. Its a kind of a sort of maybe a target more than an accurate read. Both my GP'* had terrible fuel gauges and the 91 GP never read the correct water temp.
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Old 11-30-2006, 09:17 PM   #7
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TwoB'*..

Sounds like your car may have had a sticky pressure relief spring or other little metal (I don't know the name) part.
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Old 11-30-2006, 09:39 PM   #8
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BillB, does sound that way. Would a chemical flush un-stickify it?
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Old 11-30-2006, 09:49 PM   #9
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Replacing the inexpensive sensor would fix it. Chemicals wouldn't really figure into the solution.
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