Re: Need to replace nuetral safety switch on a 1991 Buick...
It is located on the transmission follow the gear shift cable to the end on my 1996 nissan sentra it is located on the front righthand side if your looking at the engine (below the battery) it has 3 (10mm) screws to remove and it slips out of the gear shift cable.
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No, nothing special to remove them. Except you need a floor jack under the transmission to jack it up some to get the angle right when going back in. Have fun. Just a note. I would replace the rear main seal on the engine and the torque converter seal in the transmission while it is out. Even if it isn't leaking. Both are old and tired.
The Neutral Safety switch monitors the position of your gear selector lever and either interrupts or allows the starting circuit in your car or truck to do its job. On newer vehicles it may also monitor the position of the brake pedal to make sure that the vehicle is in park or neutral AND that your foot is on the brake.
If your vehicle is equipped with a neutral safety switch, it should NOT start UNLESS the transmission is in Neutral or Park. On the other hand your vehicle SHOULD start when it is in Neutral or Park. If your car will start in Neutral but not in Park, you have a bad switch. Also, if your car or truck will only start by turning the key to the start position and wiggling the gear selector lever, your neutral safty switch is in need of replacement.
The nuetral safety switch is usually found near the gear shifter. If your car has the gear shift on the column, then the neutral safety switch is usully mounted on the steering column near the brake pedal. On floor mount or console mount vehicles you will find the nuetral safety switch mounted near or on the shifter mechanism.
Could be neutral safety switch. Try starting in neutral instead of park. When a starter begins to fail, it will get "tight spots" where it gets stuck. How did you fix the security? Skirt off the time people only bypass the ignition and key with a resister, this leaves part of the security system still in the vehicle, causing the same "no start" situation. Here is a link on that.
Try holding the key in the crcnk position while you slowly move the shift lever from park to nuetral and back to park. If at any point the vehicle tries to start while you are doing this than its the nuetral safety switch. From your description it sounds like the nuetral safety is the problem.
You can find it under the passenger side, below the glove box. Usually, when they fell, you will get mutiply codes that don't make sense, but needs to be tested with a scan tool, Genesis, or Snap on Scanner.