Question about 1991 Oldsmobile Cutlass Supreme

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How to change Crank Positioning Sensor

Hi I have a 1991 Cutlass Supreme Convertible, how do I change the Crank Positioning Sensor??

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  • pndboyko May 26, 2009

    it is a 3.1

  • pndboyko May 26, 2009

    will try these hints, thanks guys and I will let you know how it goes.

  • Mike Butler
    Mike Butler May 11, 2010

    which engine?

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  • Master
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If you go in thru the passenger side wheel well you can get your arm in with a wrench to remove the hold down bolt. Alot of times the sensor is stuck in the block. You might have to twist and work it back and forth. Spraying it with Carb cleaner will help. In case you don't know it is located on the back of the block and you can see it if you look up between the engine and transmission from the bottom. You will be mad at this car and your hands will hurt when you finally get this changed.

Posted on May 26, 2009

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  • Master
  • 710 Answers

FIRST YOU NEED TO LOCATE IT. LOOK ON THE BOTTOM PULLEY TO SEE IF THERE ARE WIRES GOING TO IT. OF NOT THEN THE CRANK POSITION SENSOR MAY BE ON THE BACK OF THE ENGINE NEAR THE FREEZE PLUGS. AFTER YOU PURCHASE THE PART, TRY MATCHING IT UP WITH WHAT YOU HAVE EXPOSED ON THE ENGINE. IF I REMEMBER CORRECTLY, YOU WILL NEED AN 8MM SOCKET AND RATCHET TO REMOVE THE BOLT(S) FROM THE BACK SIDE OF THE ENGINE BLOCK. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR USING FIX-YA AND FOR AN HONEST RATING IN ADVANCE. GOOD LUCK

Posted on May 26, 2009

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I had this same problem with my '91. As the one person already mentioned, they do tend to stick in the hole and are brittle plastic and will break off as you pry and pick at them. What I found as to the reason it would not come out was, one, the rubber o-ring seal was "glued" to the metal inside the machined hole and the sensor had swollen and cracked from age and heat. I used brake parts cleaner and then sprayed WD-40 down in the hole and/or penetrate with graphite in it you can get at any parts store(O-Reilly's, Advance, NAPA, etc). I found that the easiest way to removed my stuck sensor was to remove the alternator and the bracket that it mounts to and then you can gain access down between the back side of the block and the firewall. It gives your arms more leverage this way although you will be "seeing" with your hands. A flashlight/worklight and mirror is good to get a mental picture with your mind. I just worked dug at it with pick tools, plyers etc. until I could get a good hold on it with a pair of plyers. If you are not sure what pick tools are, I have a four pack that I got from snap-on, they are basically a smaller version of a good ole fashioned ice pick with various tips, such as straight, 90 degree, angled and hook types. GOOD LUCK AND DON'T GIVE UP!!! Dan, Pleasant Hill, MO USA

Posted on Jun 24, 2009

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