LEFT TURN SIGNAL WON'T CANCEL OUT ON 91 TORONADO

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The only suggestion is behind the ashtray or under the dash because that is where Oldsmobile like to hide them. There are pictures though so you know what you are looking for.

https://www.google.com/search?q=1987+Oldsmobile+Toronado.+turn+signal+flasher+location

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change turn signal switch

Look Behind the triangle panel on the left side of the bike. Next to the battery. FUSES

One of your bulbs is out. Turn your flashers on and walk around your vehicle to see witch one it is and replace it.

it's more than likely the blinker relay

The system reset itself there is not other reset. If it won't go off then there is a problem with a part in the system and you need the dealer or a GM savvy repair shop to diagnose it.

you need to replace the turn signal switch there is a tab on the tip that get pushed by a canceling cam most gm dealers can get it for you i have a couple but i don't ship or take checks

This is weird! It seems to me that the left turn signal is getting 12v from somewhere at all times.I don't think the flasher is the problem(most GM systems use a single flasher for left and right)You probably have a crossed wire somewhere(or an add on accessory was connected to the left signal wire,allowing 12 volts to bleed through to the circuit)

What seems to be the problem with your turning signal cancellation, is the steering wheel is not in line with your wheels.
Meaning, when driving straight, take note on on where the steering wheel is positioned. If the spokes or logo on the steering wheel are turned or not level, then that's the reason for your turn signal is doing what it does.
The best way to cure this problem is take your vehicle to a wheel alignment shop that you trust, and tell the technition to position the steering wheel straight with the wheels.

Spring! time