Question about 2000 Pontiac Bonneville

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Droping Oil Pressure Gage.

I have a 2000 Pontiac Bonneville, 180k miles, rebuilt engine 2 years ago. The problem I'm having is while accelerating speed my oil pressure gage drops to zero, then it will go backup to normal. when the pressure drops the car seems to jerk a little not bad but slightly. I have changed the oil pressure sending unit once before about a year and a half ago. But what can be the problem now?????

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  • Pontiac Master
  • 1,413 Answers

With an oil pressure gauge:
Remove the oil sender unit and install an oil pressure gauge at the cold engine and let the engine warming up. And record oil pressure data.
You will see if the oil pressure match your problems if so then there is an internal leak or bad oil pump or old engine oil.

Hope it helps.

Posted on Feb 22, 2019

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Posted on Jan 02, 2017

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SOURCE: Pontiac Bonneville(2000) oil pressure sending unit

The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.

Posted on Feb 02, 2009

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SOURCE: what should a 2002 Pontiac Bonneville oil pressure

at what? depending on engine temp and rpm, normal oil psi should read 30-40 psi at idle and at cruising speed of 1500 to 2000 rpm should read 60-70 psi. most bonnevilles from 1992 to the last year run of 2005 have the 3.8 liter V6 which was updated over the years.

Posted on Oct 14, 2009

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SOURCE: Oil Pressure Guage

Oil pressure is read by the sending unit, not created by it. If you replaced the sender and do not see a minimum of 20psi there is something wrong inside the engine.Some people will tell you that 5psi is "safe". In reality, in an otherwise perfect engine it may be but in real world application, the 20psi number is the lowest I'd ever accept in any engine.(at idle) Running pressure is influenced by temperature and oil grade, but this should not vary dramatically.
It is best to attach a mechanical oil pressure gauge to the engine and in that way, you can read the exact pressure. If the mechanical gauge reads the same or very close to what you see on the dash, then the reading is correct and if low you will need further diagnosis to determine why.

Posted on Oct 20, 2009

  • 1608 Answers

SOURCE: the oil pressure gauge reads 120 psi when the

The oil sending unit is on the oil filter adapter above the oil filter.You will need a special socket for the unit.Good luck.

Posted on Nov 23, 2009

  • 266 Answers

SOURCE: I have a 2003 Bonneville.

chances are the oil pressure sending unit is not working or unplugged it is located by the oil filter. the low level oil sensor is in the oil pan and is not related to the gauge .make sure to tell the parts person weather oil sending unit is for a gauge or a light

Posted on Feb 17, 2011

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Pontiac Bonneville(2000) oil pressure sending unit


The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.

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