Fuel injectors that are clean, provide a more even fuel-air mix which results in more predictable and efficient burn in the cylinder and better fuel economy.
Fuel injectors become worn, mostly not from debris in the fuel, but from the fuel itself. Petrol contains waxy compounds that can leave varnish deposits at the injector pintle when the fuel evaporates, tending to be form when after the engine is turned off. Heat from the engine causes residual fuel in the injector tips to evaporate, leaving a varnish deposit. These deposits in the nozzle build up and restrict fuel flow or disrupt the injector’s spray pattern. On many late-model engines, the shape and direction of the spray pattern is critical for clean combustion and good performance. If the injector nozzle is dirty, the pattern may be distorted or deflected to one side, causing a lean spot in the combustion chamber that can cause misfire, or even pre-ignition or detonation.
It doesn’t take much of a restriction in an injector to lean out the fuel mixture. Only an 8% to 10% restriction in a single fuel injector can be enough to upset the air/fuel mixture and cause a misfire.
The fuel injectors can be cleaned on an inline basis (on car) or better still by having them removed and given and ultrasonic bath. If your injectors have performed close to or over 100,000 km without being thoroughly cleaned, your fuel economy will certainly improve.
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