Excess fuel in the system

The engine runs on a specific proportion fuel and air depending on factors like speed and humidity. If more fuel enters the combustion chamber, the ignition will produce an inefficient burn. This will cause a reduction in power, and black smoke to exit the exhaust as the fuel is burned.

Table of Contents

• 1. Symptoms
  • 1.1 Exhaust Blows Black Smoke
• 2. Causes
  • 2.1 Defective Fuel Injectors

Symptoms

Exhaust Blows Black Smoke

When excess fuel in the system is ignited, the composition of the exhaust gases will be altered. This will produce a black smoke from the tailpipe.

Causes

Defective Fuel Injectors

Fuel injectors that are not functioning proper may deliver too much or too little fuel to the system.