1997 crown Victoria
It’s cranks but will not start up. what is the cause
and how can I fix it
Make sure battery has a full charge and connections all good. Have a helper crank it while you check for spark at the plugs. Use a gage and check proper fuel pressure and fuel injector pulse. Any applicable trouble codes? Those are the basic checks, in my opinion. I don't know what testing you've done?
Thanks Ian’s no codes are showing so next I’ll check fuel pressure
The fuel pressure, if your right around 40 psi, should be fine.