* 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.