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

The engineers at Ford made instead of the spark plugs on the 4.6L and 5.4L engines a difficult task. Not just are the locations an overwhelming to access, yet then there"s the risk of stripping the spark plug threads. However, instead of the spark plugs are not particular daunting once you have the ideal tools in front of girlfriend - it might take you a couple of hours the very first time, however it won"t be practically as intimidating to repeat. That is normally a wise idea to replace ignition coils when you have them off, unless your current coils are relatively new or are showed to it is in in good working order. Signs that your ignition device needs attention incorporate misfire under load, hard/rough starting, bad fuel economy, and 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 your application. part numbers not applicable to manufacturing facility supercharged engines (Lightning, Harley Edition, etc).

There are a handful of "designer" spark plugs ~ above the market, however there is no better choice 보다 to select OEM Motorcraft spark plugs. The same have the right to be stated for ignition coils - there is no aftermarket different that is walking to carry out noticeable rises in power or accelerator response. The OEM Motorcraft COPs (coil-on-plug) space as high in quality (or higher) than any type of other brand on the market.

4.6L, 5.4L Spark Plug instead of Procedures

Each spark plug is accessed with a boring in the cylinder head numerous inches below each individual ignition coil. For most cylinders, you will not have the ability to physically view the spark plug; this is generally a blind operation. After ~ disconnecting the an adverse battery cable and also removing the plastic engine cover, the actions for replacing every spark plug are fairly straight forward:

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

• eliminate the coil retaining bolt making use of a 7 mm socket. Use caution as no to lose the bolt in the engine valley - ease the bolt with a socket, climate unthread completely and eliminate it by hand.

• traction the ignition coil upwards come remove; it might require a for sure tug. It"s perfectly normal for the insulator boots to different from the rest of the coil. Simply remove the boot from the cylinder head bore and reinstall the on the ignition coil.

• usage compressed air to punch out any debris indigenous the bore in the cylinder head wherein the spark plug is located. Any dirt, dust, or grime the you don"t eliminate may get in the cylinder when the spark plug is pulled.

• usage a 5/8" (1997 - 2003 version years) or 9/16" (2004+ version years) spark plug socket and a mix of expansions to eliminate the spark plug. The rubber boots inside the spark plug socket will secure the spark plug for this reason it comes out as soon as the socket is removed. Because visibility is poor at best, us recommend securing the socket and also extension(s) ~ above the spark plug and verifying a certain fit prior to attaching her ratchet - the last point you desire is to strip the hex head.

• as soon as the spark plug is loose disconnect her ratchet and also finish unthreading by managing the expansion by hand.

• Verify the space of the replacement spark plug (refer to underhood emissions brand for suitable gap, it will differ with model year). Apply a light coating the anti-seize to the threads.

• install the brand-new spark plug by very first placing the in the spark plug socket. Plugs have to be started by hand come ensure that the soft aluminum subject of the cylinder head carry out not strip. Spark plugs have to thread clearly and totally 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.

• use a dab that dielectric grease to the pointer of the ignition coil, then reinstall the coil top top the spark plug. Verify that the coil is seated on the spark plug, climate reinstall the retainer bolt, fuel injector connector, and ignition coil connector.

On financial institution 1 (passenger) the the engine, cylinder 4 is the most difficult plug to access. In order come decrease clutter and also give you yourself a larger work space, remove the cylinder 3 ignition coil and unplug the cylinder 3 fuel injector. You must 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 offered to reach this plug. The precise same setup deserve to be supplied to eliminate the cylinder 3 spark plug. Extensions will additionally be compelled to with the ignition coil retaining bolt. Instead of of the #1 and #2 cylinders is reasonably straight front with only a 6" extension.

For bank 2 (driver side), cylinder 8 will need the usage of a 7 mm wrench instead of a socket to remove the coil retainer bolt (the fuel rail boundaries access). A flexible extension can be supplied to eliminate the coil retainer on cylinder 7. (3) x 6" extensions and also a swivel/u-joint can be provided to eliminate the #7 and #8 spark plugs. The #6 spark plug is fairly straight forward to remove. Accessing the cylinder 5 plug, however, requires removing the strength steering reservoir clip (3 bolts utilizing an 8 mm socket). With the clip removed, the #5 plug deserve to be accessed with family member ease.

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

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• An military of extensions and also flex joints are required to reach the various spark plugs. Four different extension sport are forced to readjust all 8 spark plugs.