What can cause no fire at the plugs?

No fire at the plugs can be caused by several factors, including a faulty ignition system, such as worn spark plugs or ignition coils. Additionally, issues with the fuel supply, like a clogged fuel filter or fuel pump failure, can prevent the necessary fuel-air mixture from reaching the combustion chamber. Electrical problems, such as bad wiring or blown fuses, may also disrupt the spark needed for ignition. Lastly, an engine that is flooded with fuel can prevent proper ignition as well.