Crown Vic will turn over but not start

check egr valve --cat converter

can you hear the fuel pump working if not check the wiring and power and ground by the tank. check fuel pressure, as if its low it won`t start, you can get bad new parts. do you have spark at the plugs. check for codes. just some places to start.

Maybe your problem is with the one or many injectors, if just one is bad, you will have problems. Get yourself a multimeter and set it to read in ohms and find what spec the injectors should be at. If out of spec, then you need to replace that one injector(s).

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Definately sounds like the fuel pump

ck 4 fuel press. spark inj. pulse ect.!

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.
Thanks.

Check the fuel pump is working.
Check the fuel filter is not clogged.
Check if you are getting fuel from the injectors and spark from the spark plug.
Also make sure the air filter is not clogged.

I would visually check for spark at the plugs, to make sure spark is getting to the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
How long since a tune-up? Any applicable trouble codes?

try the ignition module.

check your fuel pressure
if you dont have enough pressure this will happen
when the fuel pressure is good the system will just push the air out through the injectors or the fuel return line