Question about 1998 Ford Expedition

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Shot a spark plug out of the cylinder head - 1998 Ford Expedition

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  • johnny wyatt
    johnny wyatt Aug 25, 2010

    Was it #4? did you try and put it back in? Every once in a while someone on the line doesn't do there job like there suppose too. and I know every once in a while you'll get someone who will over tighten them which will strip the threads. see if it will go back in if not you will have to get a repair kit (healy coil to fix it) or you might have to replace the head

  • james_clampe Aug 26, 2010

    well i'm pulling the head right now but there is a hose that's hard to get off so i have been trying to figure out if i can get a heile coil on it without removing the head. I don't know the firing order on this truck (its not mine) but it is the rear passenger side cylinder. also when i was trying to pull the head it was real stubborn to pull off is that normal?

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  • Master
  • 453 Answers

Yes you can repair it on the motor but its very tuff cause you really can't see what your doing. firing order doesn't matter cause its coil over plug and the wires just have enough wire to get to the right coil pack. I would try and pull the head. yes sometime they can be hard to get off make sure you have everything unbolted and out of the way. and thats #4 plug it will be very hard on the truck. I still think the plug might not have been tighten. Go to youtube I have a video directions on how to replace sparkplugs 7

Posted on Aug 29, 2010

  • johnny wyatt
    johnny wyatt Aug 29, 2010

    and 8 on a 1999 f250 5.4L might give you and ideal

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Of coarse you did, along with thousands of other Ford owners from 1998 to around 2005
There is a tool you can buy to repair that, with the head on the vehicle.
There isn't enough threads in the cylinder head,Ford knows that, and just kept selling them that way for say, six years or more!
They have some other nice features you'll enjoy, if you keep buying a ford product. Enjoy repairing that is.

Posted on Aug 27, 2010

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Posted on Jan 02, 2017

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How to change spark plugs



REMOVAL PROCEDURE
  1. Remove the ignition control modules.
  2. Clean the spark plug recess area with low pressure air.
CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.

NOTE: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.
117381099
  1. Remove the spark plugs from the cylinder heads.
NOTE: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.
  1. Inspect the spark plugs. Refer to Spark Plug Inspection.
INSTALLATION PROCEDURE
  1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications.
NOTE:
  • Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
  • Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.
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  1. Install the spark plugs to the cylinder heads.
NOTE:
  • Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.
  • Refer to Component Fastener Tightening Notice in Service Precautions.
Tighten the spark plugs to 20 N.m (15 lb ft) .
  1. Install the ignition control modules.

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3.7L Engines
Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to gain access to each spark plug. Refer to Ignition Coil Removal/Installation. Prior to removing spark plug, spray compressed air around base of ignition coil at cylinder head. This will help prevent foreign material from entering combustion chamber.

  1. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert.
  2. Inspect spark plug condition.
To install:
  1. Start the spark plug into the cylinder head by hand to avoid cross threading.
  2. Before installing coil(s), check condition of coil o-ring and replace as necessary. To aid in coil installation, apply silicone to coil o-ring.
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First, I would highly recommend that you also purchase a set of igniton cables and replace these also because you are most likely to have damaged spark plug boots when you remove the boots from the plugs. Trust me...it happens about 95% of the time, and you will be way ahead of the frustration if you are prepaired.

Pull the spark plug boots off of the spark plugs.

NOTE:

Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

Clean the spark plug recess area before removing the spark plug. (spray brake cleaner and compressed air works well) Failure to do so could result in severe engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.

Screw the spark plugs out of the cylinder head.
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The specification for the plug gap on your vehicle is 1.524mm (0.060 in)

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Screw the spark plug into the cylinder head and torque to specifications.
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1.1.2. Remove the engine plastic cover.
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1.2. Back cylinder head bank spark plugs removal:
1.2.1. Remove the inlet manifold out from cylinder head.
1.2.2. Disconnect all three ignition coils connectors.
1.2.3. Remove all three ignition coils screws.
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2.1. Refit all in reverse order.
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2. The spark plug, when replaced, was not tightened down properly (like only 2-3 threads in)
3. A combination of the above.

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