To find the number 1 position:
1. Consult your engine's service manual: This is the most reliable source. The manual will have a diagram showing the firing order and the corresponding distributor cap terminal numbers.
2. Locate the number 1 cylinder: This is usually marked on the engine block itself. If not, you'll need to trace the firing order from the service manual. The firing order for the 4.9L is usually 1-5-4-2-6-3-7-8.
3. Identify the rotor position: With the engine at top dead center (TDC) on the number 1 cylinder compression stroke, the rotor in the distributor cap should point to the terminal corresponding to the number 1 cylinder.
Without a service manual or a clear view of your specific engine, it's impossible to definitively state which terminal is number 1. Improper distributor cap wiring can cause serious engine damage. Use a service manual to ensure correct wiring.
