Question about 1990 Buick Riviera

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1990 riviera oil pressure guage goes nuts when accelerating. can just a sensor be replaced?

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Could be. Check the wiring at the oil pressure sending unit. If the wiring is good, replace the sensor. It is located Under hood, passenger side, rear engine area, above oil filter, mounted on lower timing cover. Curtorsey: Auto Zone.

Posted on Sep 07, 2009

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1 Answer

Replaced oil sensor light still comes on


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IF you have already checked the actual oil pressure with a test guage and you have already replaced sending unit(sensor), you may a have a malfunctioning guage(GM had a problem with instrument panel, gauges, for these years. You can check the tan and white wire at sender for 5volts, if thats good, you can ohm black wire and white wire to pcm, if thats good, recommend getting access to a good scanner and comparing guage read out to actual pcm data oil pressure.

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1 Answer

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Check wiring to sensor on motor clean or replace.If that is OK.then consider: older high mileage cars will start to ware their bearing and causing more back pressure under load, you may have to live with it. Unless you what to rebuild motor.

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Where is the oil level sensor located? oil guage wiggles between 40 & 60 at idle and stays on 60 on the road.


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Oil pressure guage shows low to nothing


Hi there
You should check the oil pressure sensor/wiring should be located around the oil filter area usually.
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1 Answer

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