Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. K jetronic friends of pdf all our visitors are our friends. But this is hardly feasible in systems with external mixture formation intake manifold injection systems. Ljetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant temperature sensor, fuel injectors, and the electronic control unit terminal for the constant idle systems cis if equipped.
Combustion in the gasoline engine the sparkignition or ottocycle engine 2 gasoline engine management technical requirements 4 cylinder charge 5 mixture formation 7 gasoline injection systems overview 10 kjetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaust gas treatment 32 electrical. Because the fuel is compressible, pressure waves are formed in the system. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Motronic as an integrated engine manage ment system. Continuous injection system found on european cars and volkswagen models assembled in the u. The bosch ljetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. An engine out of adjustment can cause excessive exhaust smoke, poor fuel economy, heavy carbon buildup within the combustion chambers, and short engine life. Inlet manifold depression is measured using a pressure sensor located in, or connected to the intake manifold, in order to calculate the duration of fuel injection pulses. Fuel injection fundamentals porsche club of america. How ljetronic works this basic operation is achievable without an electronic fuel injection system. All information, illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval. This fuel system has been used on lots of automobiles from the 1970s and 1980s. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as. Page 20 ljetronic system diagram the next diagram is a schematic drawing of the complete ljetronics fuel injection system.
Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. The complete system contains the following components. Bosch gasoline direct injection as the key to clean and economical engines. Testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. The diesel fuel injection system is a major component of a properly operating engine. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed. Ebook handbook textbook user guide pdf files on the internet quickly and easily bosch k. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. So, technically, the engine only needs a 19 lbhr fuel injector to support 300 hp, but this will require that the injector is at nearly a 100% duty cycle in.
See pages 286292 for important safety, emissions and warranty information. Kjetronic is different from pulsed injection systems in that the fuel flows. The system pressure of the kjetronic can not be reduced like an efi system when cleaning with our lb2912f flow meter. The right is reserved to make changes at any time without notice. Utilizing sensors that determine air and engine temperature, throttle position, exhaust gas content, and engine speed, an electronic system can precisely meter. What an electronic system offers is precise control over fuel delivery and air flow.
Bosch superseded the d jetronic system with the k jetronic and l jetronic from electro automotive at university of texas. Our bosch fuel injection pumps workshop manuals contain indepth maintenance, service and repair information. Bosch fuel injection system understanding djetronic fuel injection an overview of bosch djetronic in jaguar v12s 19751980 an overview of bosch djetronic as used in jaguar v12s from 1975 to 1980. Six credit hours are awarded for successful completion of this subcourse which consists of two lessons divided into tasks as follows. Bosch developed an electronic fuel injection system, called djetronic d for druck, german for pressure, which was first used on the vw 1600tle in 1967. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your area. Bosch le jetronic bmw copyright equiptech 1 page 1 ft. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. The main difference between carburetor and fuel injection system carburetorzfuel is atomized by processes relying on the air speed greater than fuel speed at the fuel nozzle, zthe amount of fuel drawn into the engine depends upon the air velocity in the venturi fuel injection systemzthe fuel speed at the point of delivery is greater than the air speed to atomize the fuel. Bosch superseded the d jetronic system with the k jetronic. Gasoline fuel injection system ljetronic bosch pdf. Since their introduction, jetronic f uel injoction systems have proved themselves millions of times over under the. Bosch jetronic repair manual,download bosch jetronic repair manual,free download bosch jetronic repair manual,bosch jetronic repair manual pdf ebooks, read. Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it.
The excess fuel is bypassed to the intake side of the fuel transfer pump through a relief valve. Conventionally, the injection system of a diesel engine comprises a pump, a highpressure pipe, and an injection valve. Fuel injection pumps bosch service repair workshop manuals. Electronic luellnjectlon systems the l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle system is described in t booklet ljetronic in iha bosch technical instruclion series. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations. Introduction to fuel injection systems and components 1 unit ii. Ljetronic was often called airflow controlled afc injection to further separate it from the pressurecontrolled djetronic with the l in its name derived from german. Bosch ljetronic fuel injection guide fiat fuel injected. The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which have a system pressure of 600 kpa. Pdf the gasoline engine management system electronically controls combustion. The average system pressure on all kjetronic fuel systems should be 520 kpa.
This diagram was adapted from the porsche 912e workshop manual and has been enhanced to provide additional information to assist in isolating fuel injection problems. Today, it has been superseded by gasoline injection. Licensing some of boschs ljetronic concepts and technologies, lucas. Djetronic 19671979 analogue fuel injection, d is from german. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. This is an excellent book containing a detailed description of the ljetronic fuel injection system. Cdocuments%20and%20settingstimdesktopcarburetormanual welcomeindex.
This is why engines equipped with the bosch motronic med 7 direct petrol injection system will be used for the first time in the lupo fsi and golf fsi. Not the why nor necessarily the how, primarily the what fuel injection theory brief overview of porsche fuel injection systems along the way, well look into the functions of the parts themselves injectors fuel pump pressure regulatorsdampers oxygen sensor. Vw ljetronic fuel injection workshop manual pdf yumpu. While new carburated engines were used in the european markets, vw adapted the ljetronic for the type 4 in the us due to more stringent emissions and fuel consumption regulations. Fuel injection system fault finding ljetronic fuel injection system engine difficult to start, or fails to start when cold probable cause corrective action cold start injector or thermotime switch faulty test cold start injector and thermotime. Direct petrol injection system with bosch motronic med 7. Please consult your local distributor for those items you may require. The main components of the fuel system in diesel engine are.
Many of them use a fuel pump essentially identical to the carbureted fuel systems. I personally own a vintage porsche 914, and this book really helped me understand what was actually going on behind the scenes of my fuel delivery system. The fuel injection pump is fed with fuel in abundance. While port injection systems such as ke and ljetronic employ a separate injector for each cylinder, monojetronic features a single, centrallylocated, solenoidcon. Electronically controlled gasoline fuelinjected system with lambda. This system features one centrally positioned fuel. Combustion in the gasoline engine the sparkignition or ottocycle engine 2 gasoline engine management technical requirements 4 cylinder charge 5 mixture formation 7 ignition function and requirements 10 inductive ignition systems gasoline injection systems overview 16 mmotronic engine management mmotronic. In this chapter you will learn the major components of the diesel fuel system and how they operate so. Monojetronic fuelinjection system system overview monojetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines.
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