How to replace the Spark Plugs in the 5.4L or 4.6L fitted Ford F-150, Expedition

The designers at Ford made replacing the spark plugs ~ above the 4.6L and 5.4L engines a an overwhelming task. Not only are the locations difficult to access, yet then there"s the hazard of stripping the spark plug threads. However, replacing the spark plugs are not particular complicated once you have actually the best tools in front of you - it may take friend a couple of hours the an initial time, however it won"t be nearly as intimidating to repeat. The is usually a way idea to replace ignition coils if you have actually them off, uneven your current coils are relatively new or are confirmed to be in good working order. Indications that your ignition mechanism needs attention incorporate misfire under load, hard/rough starting, negative fuel economy, and reduced performance/throttle response.

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4.6L, 5.4L Spark Plug Guide

Model Year


Ford component Number

1997 - 2000

4.6L V-8

Motorcraft SP413 or Motorcraft SP432

2001 - 2008

4.6L V-8

Motorcraft SP493

2009 - 2010

4.6L V-8

Motorcraft SP509


5.4L V-8

Motorcraft SP459

1998 - 2007

5.4L V-8

Motorcraft SP479

2008 - 2010

5.4L V-8

Motorcraft SP509

Note - constantly verify fitment for her application. component numbers no applicable to manufacturing facility supercharged engines (Lightning, Harley Edition, etc).

There are a grasp of "designer" spark plugs on the market, however there is no far better choice than to pick OEM Motorcraft spark plugs. The same can be stated for ignition coils - over there is no aftermarket different that is walking to carry out noticeable boosts in performance or throttle response. The OEM Motorcraft COPs (coil-on-plug) space as high in quality (or higher) than any type of other brand top top the market.

4.6L, 5.4L Spark Plug instead of Procedures

Each spark plug is accessed with a bore in the cylinder head numerous inches below each individual ignition coil. For most cylinders, you will not be able to physically check out the spark plug; this is mainly a blind operation. ~ disconnecting the negative battery cable and removing the plastic engine cover, the procedures for replacing each spark plug are fairly straight forward:

• Unplug the ignition coil and fuel injector connectors come gain access to the coil retainer bolt.

• remove the coil retaining bolt making use of a 7 mm socket. Use caution as no to shed the bolt in the engine valley - loosen the bolt v a socket, then unthread completely and eliminate it by hand.

• pull the ignition coil upwards to remove; it might require a certain tug. It"s perfectly regular for the insulator boots to different from the remainder of the coil. Simply remove the boot from the cylinder head bore and also reinstall that on the ignition coil.

• use compressed wait to punch out any type of debris native the bore in the cylinder head whereby the spark plug is located. Any type of dirt, dust, or grime that you don"t remove may get in the cylinder once the spark plug is pulled.

• use a 5/8" (1997 - 2003 design years) or 9/16" (2004+ version years) spark plug socket and a combination of extensions to eliminate the spark plug. The rubber boot inside the spark plug socket will secure the spark plug therefore it comes out as soon as the socket is removed. Because visibility is negative at best, we recommend securing the socket and also extension(s) ~ above the spark plug and verifying a for sure fit prior to attaching your ratchet - the last thing you desire is to piece the hex head.

• as soon as the spark plug is loose disconnect your ratchet and also finish unthreading by controlling the extension by hand.

• Verify the gap of the replacement spark plug (refer to underhood emissions label for appropriate gap, the will vary with model year). Use a light coating the anti-seize come the threads.

• download the brand-new spark plug by very first placing the in the spark plug socket. Plugs should be began by hand to ensure that the soft aluminum object of the cylinder head perform not strip. Spark plugs should thread smoothly and fully without the usage of a ratchet. When the plug is threaded into place, download a ratchet and snug increase the plug. Do not overtighten.

• use a dab of dielectric grease come the tip of the ignition coil, climate reinstall the coil onto the spark plug. Verify that the coil is seated on the spark plug, climate reinstall the retainer bolt, fuel injector connector, and also ignition coil connector.

On financial institution 1 (passenger) the the engine, cylinder 4 is the most complicated plug come access. In order to decrease clutter and also give yourself a bigger work space, remove the cylinder 3 ignition coil and unplug the cylinder 3 fuel injector. You have to then have the ability to squeeze a hand to the behind of the engine whereby the # 4 plug is located. (3) x 6" extensions and a swivel/u-joint are provided to reach this plug. The specific same setup deserve to be supplied to remove the cylinder 3 spark plug. Extensions will also be compelled to reach the ignition coil retaining bolt. Replacement of the #1 and also #2 cylinders is fairly straight forward with just a 6" extension.

For financial institution 2 (driver side), cylinder 8 will need the usage of a 7 mm wrench instead of a socket to eliminate the coil retainer bolt (the fuel rail borders access). A flexible extension can be used to eliminate the coil retainer on cylinder 7. (3) x 6" extensions and a swivel/u-joint can be offered to eliminate the #7 and also #8 spark plugs. The #6 spark plug is relatively straight front to remove. Accessing the cylinder 5 plug, however, needs removing the strength steering reservoir bracket (3 bolts utilizing an 8 mm socket). Through the clip removed, the #5 plug have the right to be accessed with loved one ease.

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4.6L and 5.4L Spark Plug Replacement, Cylinder through Cylinder

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• An army of extensions and flex joints are forced to reach the miscellaneous spark plugs. Four various extension sport are forced to adjust all 8 spark plugs.