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.
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.
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.
Likely the fuel filter is clogged so you need to change it. If you can keep the engine running by pumping throttle a few times at start up, and then it runs, check the filter; cost about $10.00. On My 1999 Mercury Grand Marquis I had to replace the Idle air control valve because it did stay running until it was warm
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That depends, all I can think of is you drove it in deep water (over five inches) if you did, then it might have gotten water in the exhaust.
Start with the ign. wires and the spark plugs.