Ford offered a 6.8-liter, V-10 engine in their 2001 F-250 Super Duty trucks. The spark plugs fire using a coil-on-plug ignition system, which has a separate coil for each spark plug. The Powertrain Control Module determines ignition timing based on inputs from engine control sensors and sends a signal to each coil to fire its spark plug. The ignition coils convert the low-voltage signal from the PCM to a high-voltage pulse delivered to the spark plugs, which require periodic replacement as they wear with use. Replace your truck's spark plugs with AWSF-22W plugs -- Ford part no. 12405.
Items you will need
- Socket set
- Safety glasses
- Source of compressed air
- Spark plug gap tool
- Plug socket
- Foot-pound torque wrench
- Inch-pound torque wrench
Locate the air cleaner outlet pipe at the air cleaner housing. Carefully pull the two smaller hoses off the hose barbs on the outlet pipe. Loosen the hose clamps securing each end of the outlet pipe using a ratchet and socket. Remove the outlet pipe from the engine.
Locate the ignition coils on top of the spark plugs on both sides of the engine near the intake manifold. Carefully pry up the coil wire terminal lock tabs and disconnect the wires from the coil. Remove the coil retaining bolts, using a ratchet and socket. Pull the coil up and off each spark plug. Put on safety glasses and blow any dirt or debris out of the spark plug wells, using compressed air.
Remove the spark plugs using a plug socket, ratchet and extension. Inspect the spark plugs for signs of abnormal wear or engine damage. Gap the new spark plugs to 0.052 to 0.056 inch, using a spark plug gap tool. Install the new spark plugs and torque them to 25 foot-pounds, using a foot-pound torque wrench.
Install the spark plug coils and retaining bolts. Torque the coil retaining bolts to 53 inch-pounds, using an inch-pound torque wrench. Install the coil wire terminals and ensure that the lock tabs snap in place. Install the air cleaner outlet pipe. Torque the air cleaner pipe hose clamps to 31 to 35 inch-pounds. Install the smaller hoses on the pipe hose barbs.
- Spark plugs wear with use and Ford recommends replacing them every 100,000 miles. However, certain types of use, such as long periods of idling and sudden, hard acceleration, can reduce the life of your plugs. Under these severe conditions, replace the F-250's plugs every 60,000 miles.
- Never assume that the spark plug is properly gapped from the factory. Always gap the plugs to the vehicle manufacturer's specifications using a spark plug gap tool.
- Refer to the Vehicle Emissions Control Information VECI decal for spark plug gap information if you live in California.
- Under normal running conditions, spark plugs should have light tan or gray deposits on the electrodes and insulator. Oil fouling, mechanical damage, carbon deposits or metal shavings are indicative of a potentially serious problem with the engine.
- Do not attempt to work on a hot engine. Allow the engine to cool before attempting to replace the spark plugs.
- Do not allow contaminants to fall into the open spark plug holes. Stuff the holes with clean shop rags or reinsert the old plugs if there will be a delay installing the new spark plugs.
- 2001 F-Super Duty/Excursion/Motorhome Chassis Workshop Manual; Ford Motor Company
- 2001 F-250 Owner Guide - 4th Printing; Ford Motor Company