Today, it has been superseded by gasoline injection systems which thanks to. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. Where can i buy the plastic fuel line material the preasure control line is. Especially fuel injection and ignition was my soecial interest since i bought my fist oldtimer in 2007, a mercedesbenz 450 sl from 1973. The bosch l jetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow. It differentiates from the le jetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. In fact, its really not all that complicated, and problems can usually be analyzed. This is to be found under the dash on the drivers side, above the bonnet release handle along with a few other relays. The d jetronic system uses constant fuel pressure and flow, so that only injection duration needs to be modified to control air fuel mixture.
This is to be found under the dash on the drivers side, above the bonnet release handle along with a. The lele2lu jetronic system is a development of the earlier bosch l jetronic fuel injection system. The bosch djetronic electronic fuel injection system is composed of 3 major. It is a euromarket 1979 280ge lwb with a manual transmission. L jetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant. Or lets have a look at one more version bosch cise continuous injection system electronic. Caution to reduce the chance of personal injury andor property damage, the following instructions must be carefully observed. 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. With the help of the electronic control unit a more precisive fuel metering is possible compared to conventional carburetors so that the more stringent emission standards could be. Technical data sheets bosch k jetronic fuel injection. Disconnect the return line from the distributor head 6a, and connect a hose from the distributor head outlet to the bottom of the auxiliary fuel tank 2a.
The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which. Kmi remanufactured ke jetronic fuel distributors are carefully remanufactured by our technicians. 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. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Gasoline fuel injection system mono jetronic pdf995 bitbin. Gasoline direct injection teaching gdi to your students 4210 rue jeanmarchand, quebec, qc g2c 1y6, canada. Lh is an abbreviation of a german term which means hot wire air mass meter. Djet bosch d jetronic fuel injection acronymfinder. L jetronic first became public knowledge as far back as 1973 simultaneously with the announcement of the mechanical k jetronic. Gtv6 and milano, however if you own any car with bosch ljetronic injection the. Bosch developed an electronic fuel injection system, called d jetronic d for druck, german for pressure, which was first used on the vw 1600tle in 1967. Ljetronic system fuel pump n uses positive displacement roller pump. Fuel management carried out by the mixture control unit. Fuel tank the fuel tank contains a fuel gauge sending unit, a filler tube and a fuel pump.
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. These fuel injection systems were considered to be really reliable and trustworthy. Marren fuel injection stocks a large inventory of fuel injection components, including fuel pumps, sensors, etc. Fuel injection first appeared in diesel engines back in 1927. Then tested and calibrated to manufacturers original specification. The first 4stroke production car equipped with fuel injection was the 1952 mercedes benz 300 sl which had direct injection into the cylinders. 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. L jetronic 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. The bosch d jetronic electronic fuel injection system is composed of 3 major subsystems. 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. The average system pressure on all k jetronic fuel systems should be 520 kpa. Le is the german designation of the european version of their air flow meter, with lu being the designation of the us version, i.
Mechanical fuel injection bosch k jetronic, bosch k jetronic the fuel pump this type of high pressure fuel pump is denoted as a roller cell pump, with the fuel entering the pump and being compressed by rotating cells that force it through the pump at high pressure. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Bosch ljetronic and motronic fuel injection systems repair guide. Lele2lu a 010902021 9705 3 system description system description general the lele2lu jetronic system is a development of the earlier bosch ljetronic fuel injection system. The l jetronic is an electronically controlled fuel injection system. The complete system contains the following components. Bosch l jetronic fuel injection troubleshooting, maintenance. Automotive fuel injection, the ljetronic on the v8 rovers. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. Mixture control unit the task of fuel management is to meter, or allocate, the correct quantity of fuel which corresponds to the amount of air drawn in by the engine. My porsche utilizes the bosch jetronic fuel injection system.
In 1984, porsche replaced the tenyearold continuous injection system, or cis with a new type of computer controlled fuel injection from bosch ag. The bosch d jetronic is an electronical gasoline injection system which was introduced in 1967. Kugelfischer fuel injection carburettor d jetronic fuel injection l jetronic fuel injection. Genuine porsche 911 197577 cis k jetronic fuel injection system complete used. D jetronic 19671979 analogue fuel injection, d is from german. It is a socalled hybrid a mixture of mechanical and electronic injection systems. How is bosch d jetronic fuel injection abbreviated. The volume of air taken in by the engine is measured to determine the amount of fuel to inject. The l jetronic was the first massproduced, fully electronic fuel injection system. Vw ljetronic fuel injection workshop manual pdf yumpu. Assuring you of quality and reliability at a cost effective price.
Gasolineengine management 4 gasolineengine management driveline torque factors 1 ancillary equipment alternator, ac compressor, etc. The main difference between carburetor and fuel injection system carburetor zfuel 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 system zthe fuel speed at the point of delivery is greater than the. Basically, it is pretty similar to the kjetronic with some changes and modifications. Gasoline injection systems overview 10 ke jetronic system overview, advantages 12 fuel supply 14 fuel metering 18 adaptation to operating conditions 22 supplementary functions 33 electrical circuitry 36 workshop testing techniques 38 ke jetronic since their introduction, the ke jetronic systems have proved themselves in millions of automobiles.
This german company can be seen as the main force behind all modern efi systems. Porsche 911 motronic engine management system overview. D some of these have thin spots from rubbing on other parts. Bosch k jetronic manual mercedes bosch ke jetronic manual bosch k jetronic service manual bosch ke jetronic workshop manual bosch d jetronic fuel injection manual manual k jetronic le jetronic l jetronic k jetronic k jetronic german k jetronic deutsch bosch manual bosch manual she bosch fsa 740 using manual bosch vp30 manual. Le is the german designation of the european version of their air flow meter, with lu being the designation. Bosch k jetronic mechanical fuel injection troubleshooter. The k jetronic is a mechanical fuel injection system which injects continuously and which needs no form of drive whatsoever. If you require a fuel system component at the time of your injector service, please let us know and we will provide you with a price quote and availability. Originally, this system was called jetronic, but the name d jetronic was later created as a retronym to distinguish it from newer. The fuel is injected by solenoidoperated fuel injection valves into the. Its wide use throughout the industry justifies its coverage in this manual. 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.
K jetronic is different from pulsed injection systems in that the fuel flows continuously from all injectors, while the fuel pump pressurises the fuel up to approximately 5 bar 73. Mechanical fuel injection bosch k jetronic, bosch k jetronic fig. It seems that bosch, fearing that some potential customers might be suspicious of electronic control systems, wanted to hedge their bets and pursue both mechanical and. Nov 21, 2009 the fuel distribu tor allocates this fuel to the injection the k jetronic is a mechanically and valves of the individual cylinders. I followed my scientific curiosity to discover every special subject on boschs d jetronic and today i consider myself a specialist on that. Find great deals on ebay for k jetronic and bosch k jetronic. Hookup the auxiliary fuel tank and fittings as shown on page 4. This manual is designed to assist the technician unfamiliar with robert bosch fuel injection systems in locating faults in the ljetronic system, isolating. With the help of the electronic control unit a more precisive fuel metering is possible compared to conventional carburetors so that the more stringent emission standards could be matched. Rebuild kit for bosch k jetronic fuel metering distributor for porsche 924. Porsche needed an entrylevel car to replace the 912 and volkswagen needed a sports car to replace its karmann ghia, so the forces were joined to build a sports car that would be an affordable porsche and a. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974.
Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. Combining this direct injection theory with electronic sensors, valves. The bosch fuel injection and engine management is a must have book for the serious automotive enthusiast or professional fuel injection theory is as important to your cars performance as are the wheels and suspension system. My 1988 928s4 has a lh jetronic system the l stands for luftmengenmessung in german, meaning air flow management and the h stands for hot wire referring the the mass air flow sensor that is used. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. The fuel is supplied by an electrically driven fuel pump which develops the pressure necessary for injection.
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. In the case of the l jetronic, the amount of air drawn in by the engine is directly measured by an airflow sensor. It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. The bosch lh jetronic electronic fuel injection system became available on the b21flh engine in 1982 and on the b23flh in 1983. System overview 18 fuel system 20 operatingdata acquisition 28 operatingdata processing 38 operating conditions 42 integrated diagnosis 58 electronic control unit ecu 62 interfaces to other systems 64 mmotronic engine management modern electronics are opening up. The fuel distribu tor allocates this fuel to the injection the k jetronic is a mechanically and valves of the individual cylinders. Based on the number of questions we get about bosch d jetronic fuel injection, many owners as well as many professional mechanics find its operation and maintenance arcane and mystifying. The pump is capable of producing a pressure of 8 bar 120 psi with a. Djet is defined as bosch d jetronic fuel injection rarely. Understanding d jetronic fuel injection an overview of bosch d jetronic in jaguar v12s 19751980 an overview of bosch d jetronic as used in jaguar v12s from 1975 to 1980. This new type of injection system, called motronic, is technologically leaps and bounds above the cis system in terms of performance and emissions control. Bosch kjetronic fuel injection part 2 volvo owners club. Classic vehicles will take you on a journey through the history of fuel injection.
Chapter 1 of drdjets d jetronic some wrongly write djetronik series tells the history of electronic fuel injection systems from bendix in 1957, first trials with amc till it was first implemented by bosch on 14. Having trouble with bosch kjetronic cis bob is the oil guy. Electronically controlled fuel injection systems are dealt with in detail in the publication electronically controlled fuel injection in the bosch technical. 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. On the 1983 and later b23flh, the fuel injection and the cis constant idle speed systems are both controlled by the same electronic control unit mounted on the right side kick panel. It has the m110 engine fitted with bosch k jetronic fuel injection and it doesnt have an oxygen sensor. The engine is pretty young, as it only has about 60,000 kms. If i replace the preasure control unit, the line will end up being too short.