Fuel Injection System Service
Scheduled Maintenance
WHAT IS IT
The process of cleaning the fuel injectors, intake valves and combustion chambers using specialized equipment. Fuel injection cleaning is now a necessary maintenance service required on today’s cars and trucks.
WHY DO IT
Fuel injectors become clogged with dirt and rust, while the injector tips plug up with varnish from gasoline. Intake valves, combustion chambers and pistons suffer from carbon deposits, which if allowed to accumulate may lead to diminished performance, reduced fuel economy and poor/uneven idle. This service dissolves these deposits and restores proper fuel flow into the combustion chamber. The benefits range from optimizing fuel economy, cleaner emissions and improved engine responsiveness.
WHEN TO DO IT
Every 40, 000 km.
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Description:
Fuel injection consists of a throttle body to control airflow, the fuel injectors, various engine sensors, an electric fuel pump and a fuel filter. The system is controlled by the car’s powertrain control module (PCM), which makes all decisions for controlling the injection system. Most early fuel injection systems used a throttle-body design, where one or more injectors were mounted on a throttle body, resembling a carburetor. Use of the throttle body system faded away gradually as multi-port fuel injection became more prevalent. Multi-port uses a separate fuel injector for each cylinder, located near each cylinder’s intake valve port. Virtually all engines now use multi-port injection.
Purpose:
Fuel injection delivers fuel to the engine in exactly the right amount for all engine-operating conditions. Not only does the system provide better control for fuel economy, performance and emissions, it also does away with many of the maintenance requirements of a carburetor.
Maintenance Tips/Suggestions:
On cars with fuel injection, some carmakers don’t recommend replacing the filter at all during the first 170,000 kilometres of "normal" driving. Since "normal" usually constitutes severe driving because of less than normal conditions, it’s best to replace the filter every two years or 40,000 kilometres. A contaminated filter can restrict fuel flow from your car’s electric fuel pump, eventually taking a toll on its life. Frequent filter replacements remove all doubt about whether the filter may cause other problems down the road.
