Have a a.w.d. and get to 40 mph and just starts weiving all over the road what could it be
One simple thing it could be is that with all wheel drive's it's critical that the owner keep all the same model and size tire on all four corner's and this is the tough one they gotta have the same (and correct) air pressure in them, the sensors for the power split for AWD does not cope well with these simple things not all the same and will cause what i have Knick named " Chuckwaggoning" as it feels as your car is now a wooden wagon on the oregon trail if you have it . other than that ck for fault codes in ecm with code checker it might tell you a wheel sensor is faulted .
SOURCE: How do you access the spark plugs 2002 mercury mountaineer
IIRC these are a coil over design. meaning the coil is over the plug. the coil should have one 8mm bolt holding it on the lower intake manifold. remove the coild to get to the spark plugs. look by the fuel injectors, coil should be just next to it or very close. coil usually says motorcraft on it and circle in design.
good luck
Michael
ASE certified
SOURCE: 2002 mercury mountaineer 4.0 starter relay location
The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.
The starter relay is in position #56 of that box.
SOURCE: 1999 Mercury Mountaineer, heater/AC fan no longer blowing
I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch(CTS) aka thermal switch and its circuit. CTS is usually located in the water jacket by the t-stat.
SOURCE: Mercury mountaineer check engine light help
My 2002 M Mountaineer had the same problem and was fixed by reading the code that showed a leak in the gas tank pressure via the cap. When I replaced this with a good after market cap and drove the car for a while and it cleared itself. A mechanic told me that's not possible, but it did clear and has not lit up except on start up where it lights for a few seconds to test the bulb - a normal function.
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