GMC firing order

GMC firing order

GMC engines typically use the same firing order as their Chevrolet counterparts, as both brands are part of General Motors. Here are the firing orders for some common GMC engines:

• 4-cylinder engines:
  • 2.5L: 1-3-4-2
  • 2.8L: 1-2-3-4
• V6 engines:
  • 4.3L: 1-6-5-4-3-2
• V8 engines:
  • 5.3L: 1-8-7-2-6-5-4-3
  • 6.0L: 1-8-7-2-6-5-4-3

It’s important to note that the firing order refers to the order in which the spark plugs fire in the engine, and it’s critical to ensure that the spark plugs are wired correctly for the engine to run smoothly. If you’re not sure of the correct firing order, consult the engine’s manual or a qualified mechanic.