Tools Needed:
- Spark plug wrench
- 5/8-inch socket
- Ratchet
- Socket extension
- Gap gauge
- New spark plugs (NGK part number TR55 or equivalent)
Instructions:
1. Let the Engine Cool: Allow the engine to cool down completely to avoid the risk of burns.
2. Disconnect the Negative Battery Cable: Locate the negative battery terminal and use a wrench to loosen and remove the nut that secures the negative battery cable. Disconnect the cable from the battery terminal and move it aside. This step is optional but recommended to prevent any electrical accidents.
3. Remove the Ignition Coil Covers: The ignition coils are located near the front of the engine. Each ignition coil has a plastic cover that needs to be removed. To remove the covers, press down on the locking tab and pull up on the cover. Do this for all 8 ignition coils.
4. Remove the Spark Plugs: Use a spark plug wrench or a 5/8-inch socket attached to a ratchet and extension to loosen and remove the spark plugs from the engine. Rotate counterclockwise to loosen them. Be careful not to drop them into the cylinder head.
5. Check Spark Plug Gap: If you installed new spark plugs, inspect the gap between the center electrode and the side electrode. The spark plug gap should be between 0.054 and 0.056 inches (1.37-1.42 mm). Use a feeler gauge to measure the gap and adjust if needed by gently bending the side electrode.
6. Install New Spark Plugs: Thread the new or regaped spark plugs into their respective holes by hand to prevent cross-threading. Once hand-tightened, use the spark plug wrench or socket to tighten them to the correct torque specification, which is usually around 15 ft-lb (20 Nm).
7. Reconnect Ignition Coil Covers: Place the ignition coil covers back onto the ignition coils and press down to lock them in place.
8. Reconnect the Negative Battery Cable: Reattach the negative battery cable to the battery terminal and secure it with the nut that was removed earlier.
9. Start the Engine: Start the engine and let it run for a few minutes to ensure proper ignition and operation.
10. Test Drive: Take your F150 for a short test drive to make sure the engine is running smoothly and without any issues.
