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What is the emission firing order for a 1992 Oldsmobile achieva?

The 1992 Oldsmobile Achieva, depending on the engine, had two different firing orders:

* For the 2.3L Quad 4 engine: The firing order is 1-3-4-2.

* For the 2.5L engine: The firing order for this engine is 1-2-3-4.

It's crucial to know which engine is in your specific 1992 Achieva to determine the correct firing order. Check your vehicle's documentation or the engine block itself for the displacement (2.3L or 2.5L).