Installing 2005-2007 Ford Focus Spark Plugs
Replacing spark plugs for the D20 and D23 engines.
- Author: David Hodson
- Time required: 30
- Difficulty: Moderate
The following guide outlines the procedure for replacing the spark plugs in the 2.0 and 2.3 liter Duratec engines found in 2004-2007 Focus models. Replacement for OEM spark plugs is suggested every 60,000 miles.
For spark plugs that have an adjustable gap between the electrodes, the suggested gap is 0.050". OEM Motorcraft double platinum spark plugs, which are used in this guide, come pre-gapped and cannot be altered.
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Twist the ignition coil and spark plug boot while lifting it straight up to remove it from the engine.
Avoid rocking the coil and boot side-to-side, since this could break the existing spark plug.
The procedure to remove the ignition coil and spark plug boot is the same for each spark plug. However, to reduce the chance of dirt entering the engine, only remove one at a time.
Use a ratcheting socket wrench with an extender and a 5/8" spark plug socket to remove the existing spark plug from the cylinder head. Make sure that the spark plug is completely seated in the rubber end of the socket before loosening it.
Spark plug sockets have rubber in the end of them to grip the spark plug and are made long enough to keep from snapping the spark plug. There are other common methods for removing spark plugs that involve using a long piece of rubber tubing to pull them out, but using a spark plug socket is the correct procedure.
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