Question about 1998 Buick LeSabre

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98 buick lesabre oil pressure dropped to 0 and engine died. added 1 quart oil, waited 30 minutes, started and drove 5 miles then oil pressure dropped to 0 and engine died. does this sound like a bad oil pump? where is the oil pump and is it hard to change for a "handy" person? thank you.

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  • Anonymous Mar 18, 2014

    I have a 97 buick lesabre got timing chain change out now motor is knocking what close da motor to start knocking 98 thousands miles on series 2 3800

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My sister had the same problem. There are 2 sensors that can cause this when they go bad. One is the oil pressure switch, which is located near the oil filter. When the PCM reads this switch, and gets a low reading, it will automatically kill the engine. The switch costs around $4.00 and is a 5 minute replacement job. The other possibility is that the crank position sensor has gone bad. When this sensor goes bad, the PCM can't read the appropriate speeds of the crankshaft, and will adjust the fuel and air mixture to compensate, often times the engine will die because it is getting insufficient fuel and air. The Crank position sensor is located on the engine block near the water pump. It is around $40.00 and at the most a 30 minute replacement job if you are unfamiliar with the process. I hope this helps. I'm a vehicle mechanic in the Air Force, with roughly 7 years of experience on the floor.

Posted on Dec 03, 2010

  • Ryan Merz
    Ryan Merz Apr 04, 2014

    thats the same problem im having on my 2005 trailblazer could it be the oil sending unit or is it more than likely what you said b4

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