Fuel injectors sticking or stuck

Fuel injectors are designed to snap shut and immediately cut off fuel supply. If they are sticking or stuck, fuel can continue to enter the combustion chamber when it's not supposed to.

Table of Contents

• 1. Symptoms
  • 1.1 Exhaust Blows Black Smoke

Symptoms

Exhaust Blows Black Smoke

If the fuel injectors are not fully closing, then more fuel will be admitted to the combustion chamber. This will alter the ratio of fuel and air, causing black smoke to exit the exhaust as the fuel is burned.

See excess fuel in the system.