Failing to find the manual, you can try these methods:
* Look on the spark plugs themselves: Sometimes the gap is stamped onto the plug.
* Consult a repair manual: A Haynes or Chilton repair manual for your specific year and model F-150 will list the correct gap.
* Check online resources: Websites like Ford's official site, or trusted automotive forums, may have the information, but always double-check with a reliable source before making adjustments.
Do not guess. Using the incorrect spark plug gap can damage your engine. Always refer to the manufacturer's specifications.
