Will a faulty ignition coil cause the engine to fail to start?

Yes, a faulty ignition coil can cause the engine to not start. The ignition coil is a key component in generating the electrical spark that ignites the fuel-air mixture. If the ignition coil fails, it can cause the following problems:

No Spark: A faulty ignition coil may result in an inability to generate enough electrical spark to ignite the fuel-air mixture. This will cause the engine to not start, no matter how you start the vehicle.

Weak Spark: If a faulty ignition coil causes the spark to become very weak, it may cause the engine to have trouble starting. This may manifest as prolonged starting times, engine shuddering, misfiring, or failure to run properly.

Unstable Ignition: A faulty ignition coil can cause ignition instability. This may manifest as the engine suddenly stalling after starting or being unable to maintain normal operation.

Ignition delay: When the ignition coil fails, it may cause a delay in ignition. This will cause the engine to take longer to ignite the fuel-air mixture when starting, making it difficult or impossible to start.

If you are having problems with your engine not starting or having trouble starting, the ignition coil is one of the possible points of failure. However, there are other possible causes such as battery issues, faulty ignition plugs, fuel supply issues, etc. If you encounter such a problem, it is recommended that you seek the help of an experienced automotive technician for accurate diagnosis and repair