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What causes fuel injectors to go bad?

What causes fuel injectors to go bad?

Diagnosing a clogged injector is not always easy because it acts the same as a broken spark plug wire or a bad spark plug. One or more cylinders are not firing. Old fuel, carbon and residue inside the fuel cause fuel injectors and or their filter baskets to become clogged.


  • The engine runs rough, with abrupt power peaks.
  • There are wet patches around the injectors on the outside of the engine.
  • The 'Check Engine' light on the car's dashboard is on.
  • The car doesn't perform as well as usual under acceleration.
  • There is a strong smell of fuel in the engine bay.
  • The car's fuel consumption is higher than usual.

What happens when an injector goes bad?


One of the most common symptoms of faulty fuel injectors is an extremely violent or rough engine idle. If fuel is not properly provided to the engine cylinder, it will result in a choppy engine, when the car is in idle. Fuel injector can crack or break, which will cause a gas leak.

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