- 1). Loosen the hose clamp securing the air outlet hose to the air filter box, using a Phillips screwdriver, and pull the air outlet hose from the air filter box. Loosen the hose clamp securing the air outlet hose to the throttle body, using the Phillips screwdriver, and pull the air outlet tube from the throttle body. Set the air outlet tube in a secure location to prevent damage.
- 2). Check the gap on all six new Motorcraft AWSF-42EE, or equivalent spark plugs, using a spark plug gap tool. The correct gap for the Mustang's 3.8-liter V-6 is 0.052 to 0.056 inches. Exchange any incorrectly gapped plugs for new ones, and the recommended plugs are not adjustable.
- 3). Trace one spark plug wire toward the plug, until you find the thick rubber boot on the end of the wire -- near the exhaust manifold. Grab the rubber boot, using a set of spark plug wire pliers, and pull upward with a slight twisting motion to remove it from the spark plug.
- 4). Inspect the entire wire for any visual defects, including cracks, splits, brittleness or excessive aging. Replace the entire wire set one-by-one if any wire has a defect.
- 5). Loosen the spark plug, using a ratchet, 6-inch extension and a spark plug socket. Pull the spark plug from the engine -- notice the rubber insert inside the spark plug socket holds the plug inside the socket. Pull the plug from the socket.
- 6). Hand-thread a new spark plug into the Mustang's engine. Tighten the spark plug to 11 foot-pounds, using a torque wrench, 6-inch extension and a spark plug socket. Apply a liberal coat of dielectric grease to the inside of the spark plug wire boot. Line up the spark plug boot with the top of the spark plug, and press the boot downward onto the spark plug until it clicks into place.
- 7). Repeat Steps 3 through 6 to replace the remaining five spark plugs.
- 8). Reconnect the air outlet tube to the throttle body and air filter box, and tighten its hose clamps with a Phillips screwdriver.
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