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2006 Lincoln Mark LT Problems
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.
A ticking noise may be noted from the engine caused by one or more stuck or collapsed valve lash adjusters. The repair involves inspecting and replacing lash adjusters as necessary.
A shimmy or nibble may be noted from the steering at various speeds. The tires may be at fault and/or a steering gear damper may need to be installed. Our technicians recommend to check tires for excess run-out and replace and balance as necessary. Additionally, if needed install a steering gear damper.
A rattle, chirp, or squeak noise may be noted from the rear window area. This can be caused by excessive clearance between the glass and the run channels. The recommended repair is to clean and lubricate the run channels and add foam tape as necessary to decrease the clearance.
A clunk or thump may be noted on initial acceleration. Our technicians tell us this is commonly caused by lack of lubrication of the driveshaft slip yoke. The common correction is lubricating the slip yoke.
The shift on the fly 4WD system may stop working due to a failed transfer case motor. Replacing the Transfer case motor commonly corrects this issue.
A shudder and noise may be noted on moderate to heavy acceleration. This issue is commonly caused by improper driveline angle. In this case the driveline can be re-indexed using shims to create the optimum angle.
A clunk noise may be noted in the steering column when turning and over bumps. Our technicians tell us this can be caused by a power steering return hose without an inline flow restrictor. A revised return hose is available to correct this condition.
A click or tick noise may be noted from the steering column which can be caused by a faulty intermediate steering shaft. Replacing the intermediate shaft should correct this concern.