2005 Lincoln Navigator Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2005 Lincoln Navigator

2005 Lincoln Navigator Problems

Spark Plugs May be Difficult to Remove

Our technicians tell us the spark plugs in this 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.

Problems With EGR System are Common in High Dust Areas

In high dust areas, problems with the EGR system are common. The filter for the EGR solenoid may plug and cause the EGR to activate when it should not; this can cause the engine to stall. The dirty filter should be replaced to correct this concern.

Adjusting AC Clutch Air Gap

Checking and adjusting the AC compressor clutch air gap can extend the service life of the AC compressor.

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2005 Lincoln Navigator Reviews

Paint on rear door is chipping. Told by local body shop this is a factory defect. Door is aluminum skin and paint doesnt stick well. Automatic headlight sensor doesnt always turn left headlight on at dusk. Was pulled over and given a warning as a result. Dealer was NO HELP when asked about it. now I make sure to turn lights off when turning off truck.

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