Dethrottling in stratified charge mode and homogeneous lean charge mode in these operating modes, the vehicle operates at. 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. 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. 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.
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. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. Today, it has been superseded by gasoline injection. Ljetronic system air mass measurement n fuel injection system has to know mass of air n airflow meter provides air mass flow information u mass is calculated by volume flow and density f need device to determine flow air flap on airflow meter f need temperature to determine density temperature sensor in air flow meter afm 1 throttle plate 2 air flow meter with. 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. 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. It appears to have a variation of a bosch djet system, similar to an early 914, basically caveman fuel injection it doesnt use an o2 or lambda sensor, for instance, it operates in open loop all the time.
Djetronic 19671979 analogue fuel injection, d is from german. Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it from newer. Gasoline fuelinjection system kejetronic now with workshop testing techniquesedition 9797 this is 3rd edition september, 1997. 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. This is an excellent book containing a detailed description of the l jetronic fuel injection system. Ljetronic fuel injection technical troubleshooting article. 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. Ljet bosch l jetronic fuel injection acronymfinder.
Pdf the gasoline engine management system electronically controls combustion. 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. Gregs bosch l jetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. 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. L jetronic, lh jetronic, and motronicasanintegratedenginemanagement system. The individual factors contributing to these savings are presented on the next two pages. L jetronic, lh jetronic, and motronic as an integrated enginemanage ment system. Injection systems for gasoline engines could be operated mechanically, electronically or a combination of. This was the first electronic fuel injection system to be fitted to a production car. Ljetronic the premier diesel fuel injection shop in the. 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.
This following overview is a brief description of the 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 bosch ljetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. 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. 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. The jets and metering systems adapt fuel delivery to airflow.
Ljetronic, lhjetronic, and motronicasanintegratedenginemanagement system. Gregs bosch ljetronic fuel injection idle adjustment, diagnostic and tune up page, latest revision sept. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Bosch l jetronic fuel injection manual volkswagen type2vanagon d jetronic fuel injection pro training manual. L jetronic is a boschmanufactured electronic fuel injection featured on many early 80s cars. Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. The mechanical fuel injection system has recently been overshadowed by modern electronic injection, which enables the use of lambda closed loop control. Bosch d jetronic fuel injection of renault 17 ts fuel. Alfa romeo gtv6 forum home of the alfa romeo transaxle. It differentiates from the le jetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. General information and precautions bosch kjetronic and.
Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. A gasoline injection system must inject precisely the correct amount of fuel for the various operating conditions. Pdf gasoline engine management systems and components. 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. 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. 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. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the kjetronic system are. The bosch fuel injection systems 19701979 shop manual published by carbooks, inc. 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. 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. Gasoline fuel injection system ljetronic bosch pdf. 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. L jet is defined as bosch l jetronic fuel injection very rarely.
Bosch kejetronic system the bosch kejetronic fuelinjection system is fitted to escort rs turbo models and is a further development of the kjetronic system. 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. Mar 02, 2012 gasoline model mercedes sitting too long. The bosch djetronic fuel injection system was used by vw in the type iii in 1968. 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. So it might be easier to find sare parts to the fuel injection from a bosch dealer, i have made this translation list so. Bosch gasoline fuel injection system ljetronic book. Fuel injection system bx1987 le3jetronicd6a5mtbx19gti. Direct petrol injection system with bosch motronic med 7. General information and precautions bosch kjetronic and ke. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. In 1967 the djetronic was the first electronically controlled multipoint injection. 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. Djet is what i came across first, so im familiar with it.
Djet rocks but i havent touched kjet which i will have to as ive just picked up a kjet 280se. This is an excellent book containing a detailed description of the ljetronic fuel injection system. Bosch kjetronic fuel injection manual boschtech12d. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. The complexity of the mixture processing led to an electronically controlled system with sensors, control device and actuators. 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. Emission controledition 9798 this is 2nd edition october, 1997. How is bosch l jetronic fuel injection abbreviated. Motronic med 7 direct petrol injection system will be used for the first time in the lupo fsi and golf fsi.
It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. Until 1996, this fuelinjection system was installed as an independent system in seriesproduction vehicles, and in this. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. Georges cosworth vega has been molested by a couple of different repair shops, for instance the tps is way out of whack. 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. In 1967 the d jetronic was the first electronically controlled multipoint injection. 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. Examples home mechanical fuel injection volvo owners club. Bosch ljetronic fuel injection manual volkswagen type2vanagon djetronic fuel injection pro training manual. 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. Bosch developed an electronic fuel injection system, called djetronic d for druck. This also resulted in the first analogue control device 1 that was used in the automobile.
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 manual describes the ljetronic and its most important features. They have the potential to reduce fuel consumption by up to 15% compared to a similar engine with intake manifold injection. Advantages of the direct petrol injection system this system offers fuel savings of up to 15% in volk swagen vehicles. Apr 26, 2007 djet rocks but i havent touched kjet which i will have to as ive just picked up a kjet 280se. This definition appears very rarely and is found in the following acronym finder categories. Gasoline fuelinjection system ljetronic now with workshop testing techniquesedition 9798 this is 4th edition june, 1997. Ljetronic is a boschmanufactured electronic fuel injection featured on many early 80s cars. This fuel system has been used on lots of automobiles from the 1970s and 1980s. Please consult your local distributor for those items you may require. Product information automotive gasoline systems diagnostics and. Many of them use a fuel pump essentially identical to the carbureted fuel systems.
Jetronic, lhjetronic, and motronic as an integrated engine management system. The electronically modified bosch ke also has this capability although it never achieved the popularity of the pure mechanical system. Motronic as an integrated engine manage ment system. Ljetronic, lhjetronic, and motronic as an integrated enginemanage ment system. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. 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.