Could have had a bad signal to the PCM - engine computer . Your vehicle has electronic throttle control . Look under the dash at the top of the gas pedal ,you'll see wires going into it . Has a DC electric motor that opens an closes the throttle . Giving the vehicle more or less gas . This is controlled by the computer from inputs from the APP position sensors an suppose to be checked by throttle position sensors . Computer problem or wiring etc.... Take it to a Mercury dealer and have it checked .
SOURCE: Parking Brake Assembly for a 2004 Mercury Mountaineer
go to an advance or auto zone parts store if they are more they will price match
SOURCE: 2003 mercury mountaineer lose power when
Hi, maybe there's a problem in your starter or your battery consume more electricity.
NephetZ
SOURCE: 2005 Mercury Mountaineer rear end whine, how hard to fix
Before you do this you might want to try fresh gear lube. On Ford products they use a synthetic additive in the rear and not in the front 4x4 axle.
The next thing would be to determine if it is a wheel bearing or a pinion bearing. You have to pull the axles and eliminate them as the problem. You might get lucky and not need to do the pinion.
The technical part of shimming the pinion gears with replacing the pinion bearing is about the worst part of the job. You won't know about the gears until you see them. You will need extra shims on hand.
It is a moderate job for two people. If you have all the parts it can be done in a day.
Testimonial: "Thank you for your advice"
SOURCE: brake lights stay on when vehicle shut off
The BRAKE LIGHT SWITCH needs to be Readjusted, Simply Move it Closer to Pedal Arm to Adjust. There is a NUT that you must Turn to do this. If you take a Good Look at it it is SELF EXPLANITORY.
I Hope this Helps , Well I Know it Will as it5 is OBVIOUS as to what the Problem is. Have a Good Day
SOURCE: My Mountaineer accelerated while I was braking and
it could be either --throttle body sticking open will cause constant acceleration when u lift off pedal-cableless accelerator [electric gas pedal ]if a sensor or electronic part shorts out can open throttle body causing acceleration- would need to have it diagnosed to find out which problem is correct
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