god only knows
I believe it's 1-6-5-4-3-2
For a 1990 Buick Century V6 3.3L engine, the manufacturer's recommended spark plug gap is .060" (1.52mm)
Under the hood, at the front of a 1990 Buick Reatta, the horn is located on the driver's side, behind the fog light and mounted to the frame. If you lay down at the front of the car and look up under the fog light, you will see the horn.
Look here: http://autorepair.about.com/library/firing_orders/bl-fo-9636.htm
firing order is1432
1,3,2,4 that is the firing order.
the firing order is 1342
diagram of firing order on a 1990 Oldsmobile cutless 3.3 engine
Go to Google.com and type in the words "1990 Geo Tracker firing order" and it will get you to a site that will tell you.
In the Reatta it is located under the dash next to the steering collum. Silver box has "central power supply" printed on it.