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Bad key or ignition switch
Because its a 1988 Buick LeSabre
what can cause a 2002 buick lesabre to not crank
it sounds like your neutral safety switch
The switch is on the steering column about 18 inches from the floor and held in with 2 screws,. Put a new one in then adjust it by moving it back and forth to where it will start and turn off in the proper position.
Illustrate how to jump start a 2004 buick lesabre
turn ignition on leave it on for 10 minutes then switch ignition off then you start the car
Try checking the fuses under the hood. My Regal did that and I found the fuse for the electronic ignition was blown.
I found that a wire to the ignition switch was broken where you put your key in . this did not let the chip be read . and the security kept flashing.and car would not even start. after repairing the wires it started up perfect. hope this helps
Any of the following.... Bad battery, bad starter, bad ignition switch, bad neutral safety switch
I believe that the switch is located in the ignition cylinder (which you can get from any auto parts store). Unfortunately you'll need a steering wheel puller and a tilt removal mechanism before you can start with that.
Will any light come on when it's messing up? If not, you might have a problem with the ignition lock cylinder (where the key goes) or the ignition switch (the electrical part inside the steering wheel). Good Luck!!