Why My 2002 ford crown Vic backfire loud?
Did you install the plug wire,s correctly?
That's an ignition timing problem. Or your valves are burnt.
I will replace my manifold intake ,it does have cracks and replace sensors as well as my manifold gaskets ,gas filter,ect. thanks a lot man you are awesome.
Looking for a Used Crown Victoria in your area?
CarGurus has 1,049 nationwide Crown Victoria listings starting at $2,225.
Search Ford Crown Victoria Questions
Ford Crown Victoria Experts