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. Six credit hours are awarded for successful completion of this subcourse which consists of two lessons divided into tasks as follows. 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. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your area.
Testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration. See pages 286292 for important safety, emissions and warranty information. Licensing some of boschs ljetronic concepts and technologies, lucas. Utilizing sensors that determine air and engine temperature, throttle position, exhaust gas content, and engine speed, an electronic system can precisely meter. Kjetronic is different from pulsed injection systems in that the fuel flows. Direct petrol injection system with bosch motronic med 7. This is an excellent book containing a detailed description of the ljetronic fuel injection system. Bosch superseded the d jetronic system with the k jetronic. Djetronic 19671979 analogue fuel injection, d is from german. Bosch superseded the d jetronic system with the k jetronic and l jetronic from electro automotive at university of texas. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. Page 20 ljetronic system diagram the next diagram is a schematic drawing of the complete ljetronics fuel injection system. 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 right is reserved to make changes at any time without notice. The complete system contains the following components. Vw ljetronic fuel injection workshop manual pdf yumpu. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. Conventionally, the injection system of a diesel engine comprises a pump, a highpressure pipe, and an injection valve. Introduction to fuel injection systems and components 1 unit ii. Ebook handbook textbook user guide pdf files on the internet quickly and easily bosch k. How ljetronic works this basic operation is achievable without an electronic 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.
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. K jetronic friends of pdf all our visitors are our friends. Fuel injection pumps bosch service repair workshop manuals. Continuous injection system found on european cars and volkswagen models assembled in the u. Today, it has been superseded by gasoline injection.
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. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. 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. 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. What an electronic system offers is precise control over fuel delivery and air flow. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly.
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. Because the fuel is compressible, pressure waves are formed in the system. Fuel injection fundamentals porsche club of america. 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. Many of them use a fuel pump essentially identical to the carbureted fuel systems. The diesel fuel injection system is a major component of a properly operating engine. This system features one centrally positioned fuel.
Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed. 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. 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. 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. All information, illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval. The bosch ljetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow. 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.
Motronic as an integrated engine manage ment system. 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. 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. But this is hardly feasible in systems with external mixture formation intake manifold injection systems. The average system pressure on all kjetronic fuel systems should be 520 kpa. Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it. Bosch ljetronic fuel injection guide fiat fuel injected.
Pdf the gasoline engine management system electronically controls combustion. The excess fuel is bypassed to the intake side of the fuel transfer pump through a relief valve. Monojetronic fuelinjection system system overview monojetronic is an electronically controlled, lowpressure, singlepoint injection spi system for 4cylinder engines. The system pressure of the kjetronic can not be reduced like an efi system when cleaning with our lb2912f flow meter. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as. Please consult your local distributor for those items you may require. 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.
This fuel system has been used on lots of automobiles from the 1970s and 1980s. Our bosch fuel injection pumps workshop manuals contain indepth maintenance, service and repair information. The fuel injection pump is fed with fuel in abundance. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Gasoline fuel injection system ljetronic bosch pdf. Cdocuments%20and%20settingstimdesktopcarburetormanual welcomeindex. Pdf gasoline engine management systems and components. While port injection systems such as ke and ljetronic employ a separate injector for each cylinder, monojetronic features a single, centrallylocated, solenoidcon.
Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. An air flow meter, located in the air intake chamber, converts angular movement of an air baffle plate into a voltage signal, which is sent to the control unit. 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. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. These fuel injection systems were considered to be really reliable and trustworthy. 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. The main components of the fuel system in diesel engine are. 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. Bosch le jetronic bmw copyright equiptech 1 page 1 ft. Bosch jetronic repair manual,download bosch jetronic repair manual,free download bosch jetronic repair manual,bosch jetronic repair manual pdf ebooks, read. Bosch gasoline direct injection as the key to clean and economical engines.
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