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What is the firing order for a 1987 Chevy Astro Van?

The 1987 Chevy Astro Van, depending on the engine, had a couple of different firing orders.

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

* For the 4.3L V6 engine: The firing order is 1-8-4-3-6-5-7-2.

You need to check your vehicle's engine to determine which firing order applies. The engine displacement (2.5L or 4.3L) should be clearly indicated on the engine block or in your vehicle's documentation.