Adjusting the mixture. Turn it counterclockwise to lean it out. Many fuel injected bikes have an idle adjustment which should be set between 1-3% CO. After market fuel injection modules are available for bikes which have no adjustments. The signal of the lambda probe is rapidly changing at lambda=1 and more or less just ´high level´ or ´low level´ for lambda >1 or > 1, so it is perfect to adjust air to fuel ratio at exactly lambda=1. The airflow to the intake pipes of the engine cylinders is controlled through the throttle body and butterfly valve in … No sounds out of the exhaust and had plenty of power. Air flowing through a venturi, draws a fixed amount of fuel based on the size of the jet. Again, CO levels should be between 1-3% for each of these ranges. Fuel servo. I never messed with the spring but the car still acted like I was adjusting the air fuel ratio by turning the screw for the idle adjustment. Mixture adjustment is via the 3 mm allen screw, turning the screw clockwise makes the mixture richer, remember lean "out". Fuel injection carefully monitors the air flow, as it is directly relates to the fuel/air mixture. When the throttle is opened the increase of air into the manifold causes the air sensor plate rises and pushes the control pin into the FD which allows fuel out to the injectors. Before you try to adjust the mixture using an undocumented procedure, you should first go down the entire troubleshooting list of fuel injection components in the Haynes manual or another workshop manual. These units typically have adjustments for idle, mid, and high RPM ranges. My car is running lean does anybody know how to adjust the fuel mixture on a v6 cologne engine ... Higher system pressure = higher control pressure = more gas per given amount of air. To adjust the mixture, turn the Allen screw clockwise to make the mixture more rich. FUEL INJECTION ADJUSTMENT PROCEDURE. Turn the screw using a slot screwdriver until the engine reaches a smooth idle, where it is neither sputtering as a result of a lean fuel/air mix or has a strong smell of fuel from the engine running rich. (More coming soon! The fuel servo is a fuel injection system’s fuel- and air-metering unit. This will achieve the best fuel economy while supporting for … Air Fuel Tuning (A/F Tuning) Programming ECU settings for a optimul A/F Ratio * Your target AFR should be around 14.7:1 in vacuum, around 12.5:1 at static, and around 11.5-11.0:1 as you approach your peak boost level. This is what was making me confused. All of a sudden today the car was running perfectly. Title: VW L-Jetronic Fuel Injection Workshop Manual Author: Robert Bosch Keywords: VW L-Jetronic Fuel Injection Workshop Manual Created Date: 1/23/2006 12:00:00 AM Opening for the duct for impact air pressure on a fuel servo with an automatic mixture control. 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