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

The designers at Ford made replacing the spark plugs ~ above the 4.6L and also 5.4L engines a daunting task. Not just are the locations an overwhelming to access, but then there"s the hazard of stripping the spark plug threads. However, replacing the spark plugs room not particular challenging once you have the right tools in front of you - it might take friend a couple of hours the very first time, yet it won"t be virtually as intimidating come repeat. It is normally a way idea to replace ignition coils while you have actually them off, uneven your present coils space relatively new or are showed to it is in in great working order. Indicators that her ignition mechanism needs attention incorporate misfire under load, hard/rough starting, negative fuel economy, and also reduced performance/throttle response.

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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 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 not applicable to factory supercharged engines (Lightning, Harley Edition, etc).

There are a handful of "designer" spark plugs on the market, yet there is no much better choice 보다 to pick OEM Motorcraft spark plugs. The same deserve to be stated for ignition coils - there is no aftermarket alternate that is walk to carry out noticeable increases in performance or accelerator response. The OEM Motorcraft COPs (coil-on-plug) room as high in top quality (or higher) than any other brand ~ above the market.

4.6L, 5.4L Spark Plug instead of Procedures

Each spark plug is accessed with a boring in the cylinder head number of inches listed below each individual ignition coil. For many cylinders, you will certainly not have the ability to physically see the spark plug; this is mainly a remote operation. After disconnecting the negative battery cable and removing the plastic engine cover, the steps for replacing each spark plug are reasonably straight forward:

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

• eliminate the coil retaining bolt using a 7 mm socket. Usage caution as no to shed the bolt in the engine valley - ease the bolt v a socket, climate unthread fully and eliminate it by hand.

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

• use compressed air to punch out any kind of debris from the boring in the cylinder head whereby the spark plug is located. Any type of dirt, dust, or grime the you don"t remove may enter the cylinder when the spark plug is pulled.

• usage a 5/8" (1997 - 2003 model 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. Due to the fact that visibility is negative at best, we recommend securing the socket and also extension(s) ~ above the spark plug and also verifying a certain fit prior to attaching your ratchet - the last point you want is to piece the hex head.

• once the spark plug is loose disconnect her ratchet and finish unthreading by regulating the extension by hand.

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

• install the new spark plug by first placing it in the spark plug socket. Plugs must be began by hand come ensure the the soft aluminum object of the cylinder head carry out not strip. Spark plugs must thread smoothly and completely without the usage of a ratchet. Once the plug is threaded right into place, install a ratchet and snug increase the plug. Do not overtighten.

• apply a dab of dielectric grease come the pointer of the ignition coil, then reinstall the coil onto the spark plug. Verify the 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 daunting plug come access. In order to 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 have to then have the ability to squeeze a hand come the rear of the engine whereby the # 4 plug is located. (3) x 6" extensions and also a swivel/u-joint are supplied to reach this plug. The exact same setup deserve to be offered to remove the cylinder 3 spark plug. Expansions will likewise be forced to with the ignition coil retaining bolt. Replacement of the #1 and also #2 cylinders is relatively straight front with just a 6" extension.

For bank 2 (driver side), cylinder 8 will need the use of a 7 mm wrench rather of a socket to remove the coil retainer bolt (the fuel rail boundaries access). A flexible expansion can be supplied to eliminate the coil retainer ~ above cylinder 7. (3) x 6" extensions and also a swivel/u-joint deserve to be used to remove the #7 and also #8 spark plugs. The #6 spark plug is relatively straight front to remove. Accessing the cylinder 5 plug, however, calls for removing the power steering reservoir bracket (3 bolts utilizing an 8 mm socket). V the bracket removed, the #5 plug deserve to be accessed with family member ease.

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

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• An military of extensions and flex joints are compelled to reach the various spark plugs. Four various extension variations are compelled to readjust all 8 spark plugs.