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

The designers at Ford made instead of the spark plugs top top the 4.6L and 5.4L engines a daunting task. Not just are the locations challenging to access, however then there"s the threat of stripping the spark plug threads. However, instead of the spark plugs room not particular an overwhelming once you have the best tools in former of girlfriend - it may take girlfriend a few hours the very first time, but it won"t be virtually as intimidating to repeat. That is generally a way idea to change ignition coils when you have actually them off, uneven your existing coils space relatively new or are verified to it is in in great working order. Signs that her ignition mechanism needs attention encompass misfire under load, hard/rough starting, poor fuel economy, and also reduced performance/throttle response.

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4.6L, 5.4L Spark Plug Guide

Model Year


Ford part 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 - always 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 top top the market, however there is no far better choice than to choose OEM Motorcraft spark plugs. The same can be stated for ignition coils - there is no aftermarket alternative that is going to administer noticeable boosts in power or throttle response. The OEM Motorcraft COPs (coil-on-plug) room as high in high 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 v a boring in the cylinder head several inches listed below each separation, personal, instance ignition coil. For many cylinders, you will not have the ability to physically see the spark plug; this is generally a blind operation. After ~ disconnecting the an unfavorable battery cable and also removing the plastic engine cover, the measures 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 using a 7 mm socket. Usage caution as no to lose the bolt in the engine sink - loosen the bolt through a socket, climate unthread fully and eliminate it by hand.

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

• use compressed waiting to blow out any type of debris indigenous the bore in the cylinder head wherein the spark plug is located. Any type of dirt, dust, or grime the you don"t remove may go into the cylinder once the spark plug is pulled.

• use a 5/8" (1997 - 2003 model years) or 9/16" (2004+ model years) spark plug socket and also a combination of extensions to remove the spark plug. The rubber boot inside the spark plug socket will certainly secure the spark plug so it comes out once the socket is removed. Because visibility is poor at best, us recommend securing the socket and extension(s) top top the spark plug and also verifying a certain fit prior to attaching her ratchet - the last thing you desire is to piece the hex head.

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

• Verify the gap of the instead of spark plug (refer come underhood emissions label for ideal gap, it will vary with design year). Apply a irradiate coating the anti-seize to the threads.

• install the brand-new spark plug by first placing that in the spark plug socket. Plugs have to be began by hand come ensure that the soft aluminum threads of the cylinder head carry out not strip. Spark plugs must thread clear and completely without the usage of a ratchet. As soon as the plug is threaded into place, install a ratchet and snug increase the plug. Do not overtighten.

• apply a dab the dielectric grease to the pointer of the ignition coil, climate reinstall the coil onto the spark plug. Verify the the coil is sit on the spark plug, then 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 daunting plug to access. In order to decrease clutter and also give yourself a bigger work space, remove the cylinder 3 ignition coil and also unplug the cylinder 3 fuel injector. You need to then have the ability to squeeze a hand to the rear of the engine whereby the # 4 plug is located. (3) x 6" extensions and also a swivel/u-joint are used to reach this plug. The specific same setup have the right to be used to remove the cylinder 3 spark plug. Extensions will likewise be forced to with the ignition coil retaining bolt. Replacement of the #1 and #2 cylinders is relatively straight forward with only a 6" extension.

For financial institution 2 (driver side), cylinder 8 will call for the usage of a 7 mm wrench rather of a socket to remove the coil retainer bolt (the fuel rail limits access). A flexible extension can be used to remove the coil retainer top top cylinder 7. (3) x 6" extensions and a swivel/u-joint can be provided to eliminate the #7 and also #8 spark plugs. The #6 spark plug is fairly straight forward to remove. Accessing the cylinder 5 plug, however, needs removing the power steering reservoir bracket (3 bolts making use of an 8 mm socket). V the clip removed, the #5 plug can be accessed with loved one ease.

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

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