To be absolutely certain:
* Consult your vehicle's repair manual: This will have a diagram showing the correct firing order and distributor cap terminal placement.
* Look for markings on the distributor cap itself: Sometimes, the number 1 is clearly marked.
* Use a timing light: This will allow you to see which cylinder is firing at a particular moment and correlate that to the position on the distributor cap.
Without a repair manual or visual inspection of your specific distributor cap, any other answer would be a guess and potentially lead to incorrect timing or engine damage. Always rely on your vehicle's specific documentation.
