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A bad starter can cause a Mercury Grand Marquis to not start. A bad alternator or a problem with the security system can be the cause for the car not starting.
Probably a bad starter solenoid.
Sounds like a Fuel Problem to me.
Maybe the chip in the key is defective.
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.
changed sterring column changed crank sensor and fuel pump
First check spark, if you have, then check the fuel pump for pressure.
I have a Grand Marquis and shortly after I start the car you hear a sound coming from the the engine side and that is the rear air suspension lifting the car up(the sound is the air being pumped into the airsuspension to lift the car)
Diagnosis: Engine Won't Start or Run Check related link below
Could be a bad coil, plug, or injector. Start with the coil first.
Might be you alternator. Happened on my 1997 grand marq a couple of weeks ago
pre-heat spark plug, if this works then replace it.