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1,3,2,4 that is the firing order.
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.
Knowing the firing order can help a person troubleshoot engine problems. The firing order for a 1991 Geo Metro is 1-3-4-2.
the rotation is counter clock wise and the firing order is 1-3-2.
It is 1-3-4-2 and the dist turns counterclockwise and #1 is on the pass end of the engine.
1342
1-3-4-2
1-3-4-2
1-3-4-2
1-3-4-2
1-4-3-2
Assuming it's a 1.6L engine, firing order is 1-3-4-2 (counterclockwise)