While new carburated engines were used in the european markets, vw adapted the l jetronic for the type 4 in the us due to more stringent emissions and fuel consumption regulations. This manual describes the ljetronic and its most important features. Alfa romeo gtv6 forum home of the alfa romeo transaxle. Please consult your local distributor for those items you may require. The electronically modified bosch ke also has this capability although it never achieved the popularity of the pure mechanical system. Pdf gasoline engine management systems and components. The basic l jetronic consists of a fuel pump, fuel filter, fuel lines, fuel regulator, fuel injectors, coldstart injector could be omitted on some l s, thermotime switch, coolant temperature sensor, auxiliary air valve, throttle plate and an airflow sensor flap type in analog l s discussed here. The bosch d jetronic fuel injection of renault 17 ts the fuelinjection of renault 17 ts was designed by bosch and it was used by some other car makes as well. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines.
The afc fuel injection system also contains a feedback system which measures oxygen content of exhaust gases and maintains the air fuel ratio at about 14. This was the first electronic fuel injection system to be fitted to a production car. K jetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaustgas treatment 32 electrical circuitry 36 workshop testing techniques 38 k jetronic since its introduction, the k jetronic gasoline injection system has proved itself in millions of vehicles. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. 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. Ljetronic, lhjetronic, and motronic as an integrated enginemanage ment system. Advantages of the direct petrol injection system this system offers fuel savings of up to 15% in volk swagen vehicles. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. Motronic med 7 direct petrol injection system will be used for the first time in the lupo fsi and golf fsi. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the kjetronic system are.
Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it from newer. This definition appears very rarely and is found in the following acronym finder categories. How is bosch l jetronic fuel injection abbreviated. Gregs bosch l jetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. Direct petrol injection system with bosch motronic med 7. 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. It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. The individual factors contributing to these savings are presented on the next two pages. Many of them use a fuel pump essentially identical to the carbureted fuel system s.
Apr 26, 2007 djet rocks but i havent touched kjet which i will have to as ive just picked up a kjet 280se. Until 1996, this fuelinjection system was installed as an independent system in seriesproduction vehicles, and in this. Bosch ljetronic fuel injection manual volkswagen type2vanagon djetronic fuel injection pro training manual. Thisis necessary due to the added complexity and increased power output of the engine, the system provides a higher degree of mixture strength control than that provided by the k jetronic system. This fuel system has been used on lots of automobiles from the 1970s and 1980s. Mar 02, 2012 gasoline model mercedes sitting too long. Georges cosworth vega has been molested by a couple of different repair shops, for instance the tps is way out of whack. Ljetronic fuel injection technical troubleshooting article.
L jet is defined as bosch l jetronic fuel injection very rarely. Thisis necessary due to the added complexity and increased power output of the engine, the system provides a higher degree of mixture strength control than that provided by the kjetronic system. Gasoline fuelinjection system ljetronic now with workshop testing techniquesedition 9798 this is 4th edition june, 1997. So it might be easier to find sare parts to the fuel injection from a bosch dealer, i have made this translation list so it is possible to get the bosch part numbers. Description technical instruction booklet on the l jetronic fuel injection system written by bosch use this book to get to the bottom of your poor cold starting, reluctance to hot restart and to improve your general understanding and knowledge of how your porsche fuel injection system works. In the system, air flow into the engine is measured by a moving vane indicating engine load known as the volume air flow sensor vaf referred. Carburetors the question of whether to use the stock djetronic injection or a carburetor setup is one of the most hotlydebated topics on the 914 discussion lists. Djetronic 19671979 analogue fuel injection, d is from german. 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. Emission controledition 9798 this is 2nd edition october, 1997. Ljetronic the premier diesel fuel injection shop in the. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly.
This is an excellent book containing a detailed description of the l jetronic fuel injection system. Bosch l jetronic fuel injection manual volkswagen type2vanagon d jetronic fuel injection pro training manual. The bosch djetronic fuel injection system was used by vw in the type iii in 1968. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the k jetronic system are unchanged on the ke jetronic system. 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.
L jetronic, lh jetronic, and motronicasanintegratedenginemanagement system. Pdf the gasoline engine management system electronically controls combustion. Bosch ke jetronic system the bosch ke jetronic fuel injection system is fitted to escort rs turbo models and is a further development of the k jetronic system. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your area. The jets and metering systems adapt fuel delivery to airflow. L jetronic is a boschmanufactured electronic fuel injection featured on many early 80s cars. 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. Singlepoint fuel injection singlepoint throttlebody injection tbi fuel injection is the concept behind this electronicallycontrolled injection system in which a centrally located solenoid operated injection valve mounted upstream from the. Singlepoint fuel injection singlepoint throttlebody injection tbi fuel injection is the concept behind this electronicallycontrolled injection system in which a centrally located solenoidoperated injection valve mounted upstream from the throttle. Bosch gasoline fuel injection system ljetronic book. Examples home mechanical fuel injection volvo owners club. Djet rocks but i havent touched kjet which i will have to as ive just picked up a kjet 280se.
The afc fuel injection system also contains a feedback system which measures oxygen content of exhaust gases and maintains the airfuel ratio at about 14. General information and precautions bosch kjetronic and ke. Bosch developed an electronic fuel injection system, called djetronic d for druck. A gasoline injection system must inject precisely the correct amount of fuel for the various operating conditions. So it might be easier to find sare parts to the fuel injection from a bosch dealer, i have made this translation list so. Description technical instruction booklet on the ljetronic fuel injection system written by bosch use this book to get to the bottom of your poor cold starting, reluctance to hot restart and to improve your general understanding and knowledge of how your porsche fuel injection system works. Gasoline fuel injection system ljetronic bosch pdf.
Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. This following overview is a brief description of the system. Today, it has been superseded by gasoline injection. The basic ljetronic consists of a fuel pump,fuel filter, fuel lines, fuel regulator, fuel injectors, coldstart injector could be omitted on some ls, thermotime switch, coolant temperature sensor, auxiliary air valve, throttle plate and an airflow sensor flap type in analog ls discussed here. The complexity of the mixture processing led to an electronically controlled system with sensors, control device and actuators. Gregs bosch ljetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. Ljetronic, lhjetronic, and motronicasanintegratedenginemanagement system. In addition to djet disadvantages, any problems ive had with djet has been of a mechanical nature apart from the time i doused the engine in water and soaked the wiring loom and connections my injectors have held up really well, but i. The mechanical fuel injection system has recently been overshadowed by modern electronic injection, which enables the use of lambda closed loop control. L jetronic the bosch l jetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. Gasoline fuelinjection system kejetronic now with workshop testing techniquesedition 9797 this is 3rd edition september, 1997.
Bosch ljetronic l jetronic rx7 brought to you by the team at created date. Kjetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaustgas treatment 32 electrical circuitry 36 workshop testing techniques 38 kjetronic since its introduction, the kjetronic gasolineinjection system has proved itself in millions of vehicles. Bosch kjetronic fuel injection manual boschtech12d. The fuel injection system consists of an electric fuel pump, fuel pressure regulator, fuel damper, fuel injectors, cold start injector, electronic control unit ecu, and airflow meter.
In 1967 the d jetronic was the first electronically controlled multipoint injection. Dethrottling in stratified charge mode and homogeneous lean charge mode in these operating modes, the vehicle operates at. Djet is what i came across first, so im familiar with it. Carburetors accomplish this by utilizing airflow to draw gasoline out of a jet as the air passes through the carburetor.
This is an excellent book containing a detailed description of the ljetronic fuel injection system. Bosch kejetronic system the bosch kejetronic fuelinjection system is fitted to escort rs turbo models and is a further development of the kjetronic system. Bosch lejetronic fuel injection system volvo owners club. Many of them use a fuel pump essentially identical to the carbureted fuel systems. This also resulted in the first analogue control device 1 that was used in the automobile. In 1967 the djetronic was the first electronically controlled multipoint injection. General information and precautions bosch kjetronic and. Product information automotive gasoline systems diagnostics and. It differentiates from the le jetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. Fuel injection system bx1987 le3jetronicd6a5mtbx19gti. 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. They have the potential to reduce fuel consumption by up to 15% compared to a similar engine with intake manifold injection. Ljet bosch l jetronic fuel injection acronymfinder.
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