Question about Buick LeSabre
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Posted on Jan 02, 2017
The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.
The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.
If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.
If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.
Posted on Nov 24, 2008
This is probably an oil pressure sensor problem. Randomly going from 0 to over 130 is means the sensor is putting out out of range signals. Mine would even read --- at times. I told the mechanic to not spend any time troubleshooting just change the sensor. $121 including parts, labor and tax. The gage should read about 70 psi plus or minus several psi, and move up a PSI or two as you rev up the engine. It took him about 10 minutes to change it, once he got the part. There would have been a diagnostic charge of about $50, had I not been sure.
Posted on Apr 13, 2009
It could simply be maybe the person changing your oil never reset the light? or you have a oil pressure sensor leaking or not working.
most of the time its someone never reset the oil change light. even before it goes on it goes by mileage, so maybe it didnt go off yet cause you cnahged it a tad early.so noone even tried to reset it.
I guess you could have an oil pressure problem, but thats going the extreme route.. but if nothing else shows that could be a problem.
Posted on Apr 29, 2009
The oil pressure sending unit has gone bad. I sending unit is just above the oil filter and you can get to it from the top. When you face the Engine look down towards the oil filter, the oil pressure sending unit is just above that and it looks like a cylinder with two wires coming from it. If you don't see it, it's right between the exhaust manifold and oil filter.
If you go to Auto Zone or Parts Source, they'll have the oil pressure sending unit and the step by step instructions, When installing the new sensor. Do not use teflon tape or any sealant, the sensor is tapered and need's the good ground from the engine to give you right readings.
Good luck and hope this helps.
Posted on May 11, 2009
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