What Does An EFI System Do?

The EFI system is responsible for delivering fuel to the engine cylinders through a fuel injector. The injector controls the fuel-air mixture, ensuring the perfect balance of fuel and air reaches the engine. Unlike older carbureted engines, EFI systems have sensors that adjust the fuel-air mixture for optimum performance based on various engine operating conditions, including load, RPM, and throttle position.

How Does An EFI System Work?

The EFI system consists of three main parts: the fuel injector, the sensors, and the Electronic Control Unit (ECU). The ECU controls the sensors, which provide input on engine temperature, air temperature, airflow, throttle position, and crankshaft position, among others. The ECU then sends the signals to the fuel injector to control the fuel-air mixture and ensure optimal performance.

Why Is EFI System Servicing Important?

Regular EFI system servicing is critical for optimal engine performance and longevity. Neglecting to service the EFI system can cause severe engine damage and decreased fuel efficiency. It's essential to ensure your EFI system is operating correctly to avoid costly engine repairs down the line.

Common EFI Problems

• Reduced Fuel Efficiency - If your vehicle is burning more fuel than usual, your EFI system may be malfunctioning, causing your engine to work harder and consume more fuel
• Backfiring - A backfire is caused by an excess of unburned fuel igniting in the exhaust system. It's a clear indicator that your EFI system isn't working correctly
• Erratic Idling - If your vehicle is experiencing inconsistent or rough idling, it could be a sign that your EFI system needs servicing

Basic EFI Service Steps

EFI system servicing involves cleaning, testing, and inspecting the various components to ensure they are functioning correctly. Some of the basic EFI service steps include: