what do u want a diagram for I agree with the previous answer, you did not specify what kind of diagram you want. Vacuum, Electrical, firing Order etc. etc.
firing order is1432
the firing order is 1342
1,3,2,4 that is the firing order.
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.
1-3-4-2. Cylinder 1 is at the front of the Engine (where Belt(s) are) if rear drive and at the Right (Passenger) side for Front Wheel Drive.
The correct firing order is 13726548.
Pontiac.on.nimp.org That's should help you with the firing order. KOCKNMOUTH