How to bypass the security system on a 1991 olds 98

Starts everytime and shuts right down? Usually an indication of the security system. I had to bypass a 98 Malibu because of this. A lot of those era Chevys had problems. Check the videos on it. I don't know exactly what one your car has. 2005 impala security bypass YouTube

if it has the resistor in the key it bypasses the same as all GM pass code cars VATS Bypass Passkey IIhttps://youtu.be/y9QQrrRxrxI

No, the 98 is a VATS system. The 2000 is a passlock system. If the ignition still physically works, you CAN bypass the security feature.

http://www.diy-gm-security.com/

You have the original key? If you don't, then save up to get t to a dealer and have the lock put in and have it reprogrammed. there is no bypassing a security system. Even places that claim this, all they do is bypass part of it. Like the key. Fords are different. They car has to be programmed to the key. Instead of the key programmed to the car.

turn the ignition on and leave it on for 15 minutes (not a misprint)-this is a failsafe way of bypassing the security system. Don't short change it, make sure it is OVER 15 minutes before you try to start it-the security light will go off. You are having a problem with the ignition switch not recognizing the resistance in the switch when the key is in anymore. you can bypass it if you remove the harness to the theft module and add a resistor to simulate the key. It is not as difficult as it sounds. Let me know if I can help more.

its your security system is locked you out you have to go to dealer or bypass it yourself .

their isnt one its built into the ECU dealer only unless its a diesel then i can tell you how to bypass it but a petrol??

ground the purple wire

Review this Wiring Schematic about Olds 98 ('89, '90 & '91):
1989 1
1989 2

1990 1
1990 2

1991 1
1991 2

I really hope help you with this (remember rated this help). Good luck.

If you have the passkey system you might want to take the key to the dealer to have it tested, and if that is ok then there is a way to bypass the security system which I had to do in my Bonneville.