First check spark, if you have, then check the fuel pump for pressure.
changed sterring column changed crank sensor and fuel pump
Check the ignition coil on the Marquis. Check the crank sensor as well. One of these is probably bad.
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.
Cranks and turn over are the same thing. It may crank or turn over and not start. If that is the case, find out if it needs fire or fuel and go from there.
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
Make sure the air filter is clean. Fuel can't burn without air. Also try replacing the spark plugs.
First off, does it turn over (crank) and not start? If it does and the motor sounds like it should start and it doesn't then check and see if your car is equipped with an ignition module, which I'm pretty sure it does. If it has an ignition module, replace that and it should solve your problem. Ignition modules are inexpensive and easy to install.
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That's something you would have to look at yourself, we can't give you an answer unless you tell us in more... er.. detail.