Bosch K-Jetronic Fuel Injection Since their introduction, the Jetronic fuel injection systems have proved themselves millions of times over under the harsh conditions of everyday driving. This success is a result of the advantages which fuel injection can offer when considering today's demands for economy, performance, and cleaner exhausts. The K-Jetronic is a mechanical system in which the fuel is continuously metered in accordance with the amount of air drawn in by the engine. Using the Lambda sensor together with additional equipment for the Lambda closed-loop control facility, the K-Jetronic can already comply today with the exhaust-gas regulations of tomorrow. The construction and principle of operation of the K-Jetronic is dealt with in this Technical Instruction manual. It must be stressed that the implementation of this system by Volvo on many of its cars, involves some modifications, according to car model, engine, year and country of issue. CONTENTS PART 1 The engine's fuel requirements Air-fuel ratio Excess-air factor Fuel-management systems Electronically controlled systems Mechanical systems K-Jetronic Fuel supply Outline of system Electric fuel pump Fuel accumulator Fuel filter Primary-pressure regulator Fuel-injection valve PART 2 Fuel management Mixture-control unit Air-flow sensor Fuel distributor Control pressure Differential-pressure valves Mixture information Mixture adaptation Cold start Warm-up Load conditions Acceleration response Influencing the air-fuel mixture PART 3 Electrical circuitry Function Exhaust-gas techniques Exhaust-gas composition Catalytic after-treatment Lambda closed-loop control Remember to take all necessary safety precautions when working on your car.