When the car is on, or the steering wheels are turned, or it is being driven under 35-40 MPH there is a buzzing sound. The buzz is similar to the buzz some Lincoln's made in the 80's when the key was in the ignition and the door was opened. The sound stops above 40 MPH. I don't want to begin playing the guessing game on changing parts. The alternator seems fine as it has had the sound for about 1 1/2 weeks and the battery still has power.
SOURCE: Key won't turn in ignition
Turn the steering wheel with one hand while turning the key with the other.
SOURCE: 2004 MERCURY GRAND MARQUIS ALL DOORS OPEN WITH
This sounds most like a worn lock actuator which wouldn't be uncommon. If you need a diagram on how to replace, let me know.
SOURCE: 2006 mercury grand marquis has clicking sounds front area of car
Have your front c.v shaft's checked out, when shaft are bad it will make a clicking noise.
SOURCE: 1993 Mercury Grand Marquis Idle
I have replaced many of these valves for the same noise problem, only one thing comes to mind the throttle body is full of sludge and restricting airflow, clean it with throttle body cleaner and a soft rag, then disconnect the battery for 5 minutes to reset learned idle strategy, if that doesn't clear the problem you either have a defective valve or you have the wrong part, there are about 4 of these valves, the correct valve for your car looks like this one below. I also will include Motorcraft part #
MOTORCRAFT Part # CX1660
Hello, This can be an Ignition switch if you have the Ignition on the steering column. If this happens only at "Idle" speeds then the problem may be that the engine is idling too slow. If at any speed, then disregard the idle as the problem.
There are several screws holding the plastic steering column cover on. They generally are in recessed holes in the bottom of the plastic cover. Some Ignition switches are more complicated to remove. There is a push hole for a spring in the lock cylinder which allows the core to come out.
You will need to disconnect and reconnect the battery several times because the Key core needs to be in the Acc or Run position for the core to line up to be removed.
This is not a difficult job for an Experienced person. You do have to mark the Key switch position to its mounting place. The connection lengths for the rod or cable running through the steering column is critical. This is why you try to match the switch position before tightening everything down.
You may also find that the mounting bollts have Security shapes on them requiring matching sockets to fit over them to turn them. They are available at Autoparts stores.
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