Bosch ljetronic l jetronic rx7 brought to you by the team at created date. This is to be found under the dash on the drivers side, above the bonnet release handle along with a few other relays. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. Bosch licensed the concept to many automobile manufacturers. The average system pressure on all k jetronic fuel systems should be 520 kpa. 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. Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. The pump is capable of producing a pressure of 8 bar 120 psi with a. 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. Along the way even the mechanical k jetronic spawned the hybrid ke jetronic an electronically trimmed mechanical system. The bosch lh jetronic electronic fuel injection system became available on the b21flh engine in 1982 and on the b23flh in 1983.
Bosch k jetronic fuel injection manual pdf document. Bosch ljetronic and motronic fuel injection systems repair guide. Vw ljetronic fuel injection workshop manual created date. 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. 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. The volume of air taken in by the engine is measured to determine the amount of fuel to inject. The djetronic system uses constant fuel pressure and flow, so that only injection duration needs to be modified to control airfuel mixture. Originally, volkswagen adapted the l jetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations. Kmi remanufactured kejetronic fuel distributors are carefully remanufactured by our technicians. This manual is designed to assist the technician unfamiliar with robert bosch fuel injection systems in locating faults in the ljetronic system, isolating. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed and marketed by robert bosch gmbh from the 1960s onwards. Gasolineinjection systems overview 10 kejetronic 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 kejetronic since their introduction, the kejetronic systems have proved themselves in millions of automobiles.
Today, it has been superseded by gasoline injection systems which thanks to. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. The electronic ignition module with selfdiagnosis is bosch. The fuel is supplied by an electrically driven fuel pump which develops the pressure necessary for injection. The fuel distribu tor allocates this fuel to the injection the kjetronic is a mechanically and valves of the individual cylinders. 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. For those not familiar with bosch l jetronic fuel injection you may want to start with l jetronic seminar in pdf format. From the factory on certain mustangs and ford lightnings, ford utilized a jetronic fuel injector harness. Bosch k jetronic manual mercedes bosch ke jetronic manual bosch kjetronic service manual bosch ke jetronic workshop manual bosch d jetronic fuel injection manual manual kjetronic le jetronic l jetronic kjetronic kjetronic german kjetronic deutsch bosch manual bosch manual she bosch fsa 740 using manual bosch vp30 manual. I followed my scientific curiosity to discover every special subject on boschs d jetronic and today i consider myself a specialist on that. Bosch l jetronic fuel injection troubleshooting, maintenance. Find great deals on ebay for k jetronic and bosch k jetronic. The bosch djetronic electronic fuel injection system is composed of 3 major subsystems. Genuine porsche 911 197577 cis kjetronic fuel injection system complete used.
Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. 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. Kjetronic cis fuel system diagram shown below is a schematic diagram of fuel lines in a kjetronic as a whole with noise damper and drain line at the fuel accumulator. Bosch k jetronic mechanical fuel injection troubleshooter. Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. There are several variations of the technology offering technological development and refinement. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. There are various switches, valves and realysin the k jetronic fuel injection system, so i will try and describe their function and how to test them. Or lets have a look at one more version bosch cise continuous injection system electronic. The bosch lhjetronic electronic fuel injection system became available on the b21flh engine in 1982 and on the b23flh in 1983. This is to be found under the dash on the drivers side, above the bonnet release handle along with a. Basically, it is pretty similar to the kjetronic with some changes and modifications. Bosch k jetronic fuel injection manual linkedin slideshare.
Another excellent source of general info on the bosch injection system from the early d jetronic electronic to k jetronic mechanical constant injection all the way to the later variations of the motronic engine management with lambda exhaust sensing to allow the system to function closedloop, is the book. This was a microsoft powerpoint document, presented at the 1999 e12 fall fest in virginia beach, va. Vw l jetronic fuel injection workshop manual author. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. The bosch djetronic is an electronical gasoline injection system which was introduced in 1967.
Robert bosch gmbh, 2000 postfach 30 02 20, d70442 stuttgart. Fuel tank the fuel tank contains a fuel gauge sending unit, a filler tube and a fuel pump. 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. L jetronic first became public knowledge as far back as 1973 simultaneously with the announcement of the mechanical k jetronic. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. The fuel is injected by solenoidoperated fuelinjection valves into the. It is a socalled hybrid a mixture of mechanical and electronic injection systems. 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. Vw ljetronic fuel injection workshop manual author. Technical data sheets bosch k jetronic fuel injection. Aug 11, 2014 gasolineengine management gasoline fuel injection system k jetronic technical instruction published by. I followed my scientific curiosity to discover every special subject on boschs djetronic and today i consider myself a specialist on that. 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.
The bosch d jetronic is an electronical gasoline injection system which was introduced in 1967. Fuel injector adapter kit quickly and easily adapt uscar fuel injectors to your mustang or ford lightning, with jetronic harness, using this fuel injector adapter kit. Its wide use throughout the industry justifies its coverage in this manual. The complete system contains the following components. The le jetronic system is electronically commanded and injects the fuel in the intake manifold. The l jetronic is an electronically controlled fuel injection system. The bosch l jetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Le is the german designation of the european version of their air flow meter, with lu being the designation of the us version, i. In the case of the l jetronic, the amount of air drawn in by the engine is directly measured by an airflow sensor. In fact, its really not all that complicated, and problems can usually be analyzed with no more than a pressure gauge, a multimeter and a little common sense. Ljetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. 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.
Electronic fuel injection systems include bosch lhjetronic 4. Gasolineengine management gasoline fuelinjection system kjetronic technical instruction published by. The lele2lu jetronic system is a development of the earlier bosch ljetronic fuel injection system. Manual l jetronic fuel injection system porsche 912e bosch technical instruction l jetronic pdf manufactured by the company bosch presented for you in electronic format page size 586 x 829 pts rotated 0 degrees. Bosch kjetronic fuel injection part 2 volvo owners club. The ljetronic was the first massproduced, fully electronic fuel injection system. Chapter of djetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Another excellent source of general info on the bosch injection system from the early djetronic electronic to kjetronic mechanical constant injection all the way to the later variations of the motronic engine management with lambda exhaust sensing to allow the system to function closedloop, is the book.
Gasolineengine management 4 gasolineengine management driveline torque factors 1 ancillary equipment alternator, ac compressor, etc. 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. 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. For those not familiar with bosch ljetronic fuel injection you may want to start with l jetronic seminar in pdf format. Fuel management carried out by the mixture control unit. My porsche utilizes the bosch jetronic fuel injection system. Also visit my website for 7 free download manuals starting. 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. Bosch le jetronic bmw copyright equiptech boschlejetronic thereismuchconfusionabouttheactualtypeofinjectionsystemfittedtomanybmwmotorcarsduringtheperiod1980to. 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. Vw l jetronic fuel injection workshop manual created date. Some less endearing features of d jetronic, the trigger switches and inductive manifold pressure sensor, were dispensed with and, instead of running at constant gauge pressure, fuel pressure was referenced to manifold.
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. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. Ljetronic system fuel pump n uses positive displacement roller pump. Combining this direct injection theory with electronic sensors, valves. The kjetronic is a mechanical fuel injection system which injects continuously and which needs no form of drive whatsoever. This definition appears rarely and is found in the following acronym finder categories. Electronically controlled fuel injection systems are dealt with in detail in the publication electronically controlled fuel injection in the bosch technical. The injection has as function to provide the amount of fuel exactly dosed, necessary to. Automotive equipment business sector, department for automotive services, technical publications khpdi2. Jonas schmitt vanished the sixty year search for missing men of world war ii wil s hyltonyamaha user guide instructionsgenirevolution mission answer guideinotes app manual guide2014 polaris. The l jetronic was the first massproduced, fully electronic fuel injection system. 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. The bosch djetronic electronic fuel injection system is composed of 3 major. There are various switches, valves and realysin the kjetronic fuel injection system, so i will try and describe their function and how to test them.
Djet bosch d jetronic fuel injection acronymfinder. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Based on the number of questions we get about bosch djetronic fuel injection, many owners as well as many professional mechanics find its operation and maintenance arcane and mystifying. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. 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 l jetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. Then tested and calibrated to manufacturers original specification. 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 ljetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow. The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which. Ke3jetronic fuel injection system, it is also possible to have a negative increase in the supply to the eha which will lean off the mixture.
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