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 top top the 4.6L and also 5.4L engines a an overwhelming task. Not only are the locations difficult to access, however then there"s the danger of stripping the spark plug threads. However, instead of the spark plugs space not particular difficult once you have actually the ideal tools in front of girlfriend - it may take friend a few hours the first time, yet it won"t be practically as intimidating come repeat. That is typically a way idea to replace ignition coils when you have actually them off, uneven your existing coils are relatively new or are verified to be in great working order. Indicators that your ignition device needs attention incorporate misfire under load, hard/rough starting, negative fuel economy, and also reduced performance/throttle response.

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4.6L, 5.4L Spark Plug Guide

Model Year

Engine

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

1997

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. part numbers not applicable to manufacturing facility supercharged engines (Lightning, Harley Edition, etc).

There room a grasp of "designer" spark plugs top top the market, however there is no far better choice 보다 to select OEM Motorcraft spark plugs. The same deserve to be said for ignition coils - there is no aftermarket different that is walk to administer noticeable boosts in power or throttle response. The OEM Motorcraft COPs (coil-on-plug) space as high in top quality (or higher) than any kind of other brand ~ above 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 listed below each separation, personal, instance ignition coil. For most cylinders, you will not have the ability to physically watch the spark plug; this is generally a remote operation. After disconnecting the an unfavorable battery cable and removing the plastic engine cover, the procedures for replacing each spark plug are reasonably straight forward:

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

• eliminate the coil retaining bolt utilizing a 7 mm socket. Use caution as no to shed the bolt in the engine sink - loosen the bolt with a socket, climate unthread completely and eliminate it through hand.

• pull the ignition coil upwards come remove; it may require a firm tug. It"s perfectly common for the insulator boot to separate from the rest of the coil. Simply remove the boot from the cylinder head bore and also reinstall the on the ignition coil.

• usage compressed wait to blow out any type of debris indigenous the boring in the cylinder head whereby the spark plug is located. Any kind of dirt, dust, or grime that you don"t eliminate may get in the cylinder as soon as the spark plug is pulled.

• use a 5/8" (1997 - 2003 model years) or 9/16" (2004+ version years) spark plug socket and also a combination of extensions to eliminate the spark plug. The rubber boot inside the spark plug socket will certainly secure the spark plug for this reason it come out once the socket is removed. Since visibility is poor at best, we recommend securing the socket and also extension(s) ~ above the spark plug and also verifying a certain fit prior to attaching her ratchet - the last thing you want is to strip the hex head.

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

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

• download the new spark plug by very first placing the in the spark plug socket. Plugs should be started by hand to ensure that the soft aluminum object of the cylinder head execute not strip. Spark plugs need to thread clearly and completely without the use of a ratchet. Once the plug is threaded right into place, install a ratchet and snug up the plug. Do not overtighten.

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

On bank 1 (passenger) that the engine, cylinder 4 is the most an overwhelming plug come access. In order come decrease clutter and also give yourself a bigger work space, eliminate the cylinder 3 ignition coil and also unplug the cylinder 3 fuel injector. You have to then be able to squeeze a hand come the rear of the engine where the # 4 plug is located. (3) x 6" extensions and also a swivel/u-joint are offered to with this plug. The exact same setup deserve to be provided to eliminate the cylinder 3 spark plug. Extensions will also be forced to reach the ignition coil retaining bolt. Replacement of the #1 and #2 cylinders is fairly 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 instead of a socket to eliminate the coil retainer bolt (the fuel rail borders access). A flexible extension can be offered to remove the coil retainer top top cylinder 7. (3) x 6" extensions and a swivel/u-joint can be supplied to remove the #7 and also #8 spark plugs. The #6 spark plug is reasonably straight forward to remove. Accessing the cylinder 5 plug, however, calls for removing the power steering reservoir clip (3 bolts making use of an 8 mm socket). Through the parentheses removed, the #5 plug have the right 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 army of extensions and also flex joints are required to with the miscellaneous spark plugs. Four various extension sport are required to readjust all 8 spark plugs.