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What is the spark plug wiring for a Pontiac 403?

The firing order for a Pontiac 403 V8 is 1-5-3-7-2-6-4-8. However, the spark plug wire routing on the engine itself will vary slightly depending on the year and specific engine configuration. There's no single definitive diagram that works for all 403s.

To determine the correct wiring for *your* specific 403, you need to:

* Consult your owner's manual: This is the best source if you have it. It will have a diagram showing the correct wire routing.

* Look for a diagram under the hood: Pontiac sometimes stamped firing order or wiring diagrams on the engine valve cover or intake manifold.

* Use a Pontiac 403 specific repair manual: A Haynes, Chilton, or factory service manual will have detailed diagrams and instructions.

* Search online: Use your specific engine's details (year, model, VIN) in a search to find diagrams. Be cautious about the accuracy of online sources.

Important Note: Incorrect spark plug wiring can lead to misfires, poor performance, and engine damage. If you're unsure, it's best to consult a professional mechanic. Don't guess – get it right.

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