What is the sequence for spark plug wires on a 1988 Grand Prix 2.8L?

The firing order for a 1988 Pontiac Grand Prix with the 2.8L V6 engine is 1-6-5-4-3-2. However, the spark plug wire sequence will depend on the distributor cap's terminal arrangement. There's no single definitive answer without visually inspecting your distributor cap to see the number arrangement on its terminals. The firing order itself remains consistent.

To determine the correct wire routing:

1. Identify the number 1 cylinder. This is typically the cylinder closest to the timing chain cover (front of the engine).

2. Locate the number 1 terminal on your distributor cap.

3. Follow the firing order (1-6-5-4-3-2) and connect the spark plug wires accordingly. The wire from number 1 terminal on the distributor cap should go to the number 1 spark plug. Then, the next wire from terminal 6 on the cap to plug 6 and so on, following the firing order.

It's crucial to visually check your distributor cap. A diagram printed on the cap itself might be helpful or a picture of the cap's terminal numbers for your specific model. A Haynes or Chilton repair manual for your vehicle would show a diagram.

Caution: Incorrect spark plug wire routing can cause misfires, poor performance, and engine damage. If you're unsure, it's best to consult a repair manual or a qualified mechanic.