Just turn the key to the first position, ( not on ) and then you will be able to shift to neutral and start the car from there. Have the fuses checked and check the shifter sensor on the brake pedal.
You don't mention what year of Mercury Grand Marquis but the owners manual will explain what to do if the transmission gear shift lever will not shift out of ( P / PARK ) with the brake pedal depressed ( it has what Ford calls the " brake shift interlock " ) As of August 6 , 2012 you can still view the Mercury Grand Marquis owners manual online ( back to the 1996 model ) at : www . motorcraft service . com ( no spaces ) Click on Owner Guides
Try adjusting the modulator valve
Stuck in Park? Check to see if the stop lights are working - shift interlock is the same circuit - check the stop light fuse Try to turnthe key to 1st (unlock) position, shift to neutral start vehicle and the shift to Drive
check your brake lights if they not worhing replace fuse or brake light switch
Into Park or out of Park?
what will fix the overdrive light from flashing in a 1996 mercury grand marquis its a gear ratio problem between 1 and 2 shift
sorry that's a aod transmission they don't have modulators.the shift is controled by the kickdown cable
Find the switch attached to the brake pedal for the shift interlock and jump the two wires together. Be careful not to disconnect the brake light switch
Check the fuses- Shift interlock is the same circuit as brake lights. As a temporary measure - try to turn the key to 1st (unlock) position shift to neutral to start vehicle and then shift to Drive.
If it works like the one in my '94To set it: in park press the pedal to the floor.To release it press the regular break pedal and shift out of park.
do not put any pressure on shift lever until brake is pushed. also lift shift lever directly up when placing into reverse.
It could be a fuse. If the brake lights do not turn on when you press the brake pedal check your fuses under your dash.
Best I can tell you is that it is electronic. Check at your local Ford parts dept. They should be able to help you.
You will have to add more info ??
play in the drive train
Sure, just don't shift it into 4 wheel drive...
THE BRAKE LIGHT SWITCH IS NOT PUTTING OUT BATTERY WHENEVER THE BRAKE PEDAL IS PUSHED DOWN. CHECK TO SEE IF BRAKE LIGHTS COME ON WHEN BRAKE PEDAL IS PUSHED DOWN. IF BRAKE LIGHTS COME ON, THEN YOU SHOULD BE ABLE TO SHIFT IT OUT OF PARK. IF NO BRAKE LIGHTS, THEN IT WON'T SHIFT OUT OF PARK. IF THIS IS THE CASE, THEN REPLACE BRAKE LIGHT SWITCH.
Overdrive is the normally allowed position . It won't shift into overdrive until the speed is higher anyway , such as on the highway / freeway
Sounds like a bad Brake Light Switch. It's located on the steering column.
Linkage is broken or loose - or trans pump shaft is broken ( big job)
i dont know why but mine wont shift if you go past 3 grand when you first start out. if you do you have to restart it again ,and at first dont go past 3 grand when you first take off.
There is no free drive in Need for Speed Shift.
The transmission is controled by the computer. If it will not shift, there is a problem. There is no (vacuum) modulator. Take the car to a dealer or a good transmission shop. Be prepared to have it rebuilt or replaced.
The Grand Cherokee is constant 4wd. The switch on the console (if equipped) puts it into low range 4wd.
Shift solenoids are inside the transmission.