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 ~ above the 4.6L and 5.4L engines a difficult task. Not just are the locations daunting to access, yet then there"s the threat of stripping the spark plug threads. However, instead of the spark plugs are not particular daunting once you have the ideal tools in former of friend - it may take friend a few hours the an initial time, yet it won"t be almost as intimidating to repeat. That is typically a way idea to replace ignition coils if you have them off, unless your existing coils space relatively brand-new or are proved to be in an excellent working order. Indicators that your ignition device needs attention encompass misfire under load, hard/rough starting, poor fuel economy, and reduced performance/throttle response.

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Related Topics:

5.0L, 5.8L Windsor V-8 Spark Plug Replacement
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In-tank Fuel Pump Replacement
4.6L & 5.4L TPS Replacement

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

There room a grasp of "designer" spark plugs top top the market, but there is no better choice than to choose OEM Motorcraft spark plugs. The same can be said for ignition coils - over there is no aftermarket alternate that is going to provide noticeable rises in performance or accelerator response. The OEM Motorcraft COPs (coil-on-plug) are 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 boring in the cylinder head several inches below each separation, personal, instance ignition coil. For many cylinders, you will not be able to physically see the spark plug; this is primarily a remote operation. ~ disconnecting the an unfavorable battery cable and removing the plastic engine cover, the measures for replacing each spark plug are relatively straight forward:

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

• eliminate the coil retaining bolt using a 7 mm socket. Usage caution as not to shed the bolt in the engine valley - loosen the bolt v a socket, climate unthread completely and eliminate it by hand.

• traction the ignition coil upwards to remove; it may require a firm tug. It"s perfectly regular for the insulator boots to different from the rest of the coil. Just remove the boots from the cylinder head bore and reinstall that on the ignition coil.

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

• use a 5/8" (1997 - 2003 design years) or 9/16" (2004+ design years) spark plug socket and a mix of extensions to eliminate the spark plug. The rubber boot inside the spark plug socket will secure the spark plug for this reason it come out when the socket is removed. Due to the fact that visibility is poor at best, us recommend securing the socket and extension(s) onto the spark plug and verifying a certain fit prior to attaching your ratchet - the last point you desire is to piece the hex head.

• when the spark plug is loose disconnect your ratchet and finish unthreading by managing the expansion by hand.

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

• download the new spark plug by an initial placing it in the spark plug socket. Plugs have to be began by hand to ensure that the soft aluminum object of the cylinder head do not strip. Spark plugs need to thread clearly and fully without the usage of a ratchet. Once the plug is threaded right into place, install a ratchet and snug up the plug. Do not overtighten.

• apply a dab of dielectric grease to the reminder of the ignition coil, climate reinstall the coil ~ above the spark plug. Verify the the coil is seated on the spark plug, then reinstall the retainer bolt, fuel injector connector, and ignition coil connector.

On bank 1 (passenger) the the engine, cylinder 4 is the most an overwhelming plug come access. In order come decrease clutter and also give you yourself a bigger work space, remove the cylinder 3 ignition coil and also unplug the cylinder 3 fuel injector. You should then be able to squeeze a hand come the behind of the engine wherein the # 4 plug is located. (3) x 6" extensions and a swivel/u-joint are provided to with this plug. The precise same setup can be offered to remove the cylinder 3 spark plug. Expansions will additionally be compelled to reach the ignition coil retaining bolt. Instead of 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 call for the usage of a 7 mm wrench instead of a socket to eliminate the coil retainer bolt (the fuel rail limits access). A flexible extension can be used to remove the coil retainer on cylinder 7. (3) x 6" extensions and also a swivel/u-joint deserve to be supplied to remove the #7 and #8 spark plugs. The #6 spark plug is reasonably straight front to remove. Accessing the cylinder 5 plug, however, calls for removing the strength steering reservoir parentheses (3 bolts using an 8 mm socket). With the parentheses removed, the #5 plug deserve to be accessed with relative ease.

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

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• An army of extensions and flex joints are compelled to reach the assorted spark plugs. Four different extension variations are forced to change all 8 spark plugs.