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Where is the Spark Plugs on a 2005 Mercury 4.6 L engine?

Front of engine

The spark plugs are located on the front of the engine, on the top of the cylinder head. There are two spark plugs per cylinder, for a total of eight spark plugs.

To access spark plugs:

1. Remove the front engine cover by removing the four bolts that hold it in place.

2. Using an ignition socket wrench, remove the old spark plugs.

3. Install the new spark plugs. Tighten to 18 or 21 lb-ft.

4. Replace the front engine cover.