Lean Mixture

The following lists some of the possible combinations of exhaust gas values and the most likely causes.

A/F Ratio too Lean: possible problems, conditions or causes

• Lean fuel mixture,

• Ignition misfire,

• Vacuum leaks / air leaks (between air flow sensor and the throttle body),

• Bad EGR valve or vacuum hoses misrouted,

• Carburator settings incorrect,

• Fuel injector/s bad,

• O2 sensor bad or failing,

• ECM malfunctioning,

• Float level too low

Good combustion efficiency and catalytic converter working properly!