Car Problem Reports

Lincoln Mark LT Spark Plugs May be Difficult to Remove

 
Lincoln Mark LT Problem
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Model Years Affected: 2006, 2007, 2008

Engine Affected: 6 Cylinder

Average Mileage: 87,225 mi (75,000 mi - 99,450 mi)

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Our technicians tell us the spark plugs in the 5.4L V8 engine can be very difficult to remove. Ford has issued a service bulletin (08-7-6) to address this issue, which includes a recommended procedure on how to remove the plugs. Failure to follow the recommended procedure can result in the one or more spark plugs breaking off in the cylinder head.

The recommend procedure is as follows. Using this procedure will greatly reduce the chance of breaking a spark plug.

1. Break the spark plugs loose when the engine is warm.
2. Turn each plug 1/8 to 1/4 turn and soak the treads with 1/2 to 3/4 teaspoon of Motorcraft Carburetor Tune-Up Cleaner or a quality penetrating oil. Do not try to remove the plugs at this time.
3. Let the threads soak for at least 15 minutes.
4. After the soak period, tighten and loosen each spark plug, working it back and forth until the turning effort is reduced. Then, you can remove the spark plug.

There are special tools available to remove the broken spark plugs and repair shops will often charge additional labor time, over and above the quoted spark plug replacement cost, for the removal of each broken spark plug.

  • Visitor, , 6 Cylinder, 99,450 mi

    I brought my 2006 Lincoln mark LT, to the ford shop and they had 4 out of 8 plugs break off in the head. It cost $460 to replace spark plugs????? I remember, "back in the day", when I would do it and it cost me about $10. But they didn't last 100,000 miles. I now have 197,000 mile and get to do this again... Oh Boy!

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  • Visitor, , 6 Cylinder, 75,000 mi

    Ford's TSP was followed to the very letter, but still 7 of 8 plugs broke.

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