What happens when your spark plugs are bad?

Symptoms of Bad or Failing Spark Plugs. Common signs of faulty spark plugs include slow acceleration, loss of power, poor fuel economy, engine misfires, and difficulty starting the car. Without a spark, there would be no way for fuel to ignite in the combustion chamber.

Consequently, what is the function of a spark plug used in petrol engines?

A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within

Why do we need spark plug in petrol engine?

Whereas in diesel engine the air is compressed initially then the fuel i.e., diesel is injected into the cylinder. Diesel engines don't require any spark plug because the required heat to ignite the fuel is generated due to compression of air.

What does the spark plug do in an engine?

A spark plug is essentially an electrical gadget that fits into your engine's cylinder head, where it “sparks” to ignite the fuel. The plug is connected to the ignition coil that generates the high voltage needed to spark the fuel and create combustion within your engine.

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