Because the fuel is compressible, pressure waves are formed in the system. In 1990 bosch motronic fuel injection replaced ljetronic on the spider and 164 models. The le jetronic ecu contains a fuel map with an injector opening time for basic. Ke3 jetronic pdf mercedes suggests that special tools are required to adjust the mixture on the bosch ke3jetronic. The pump is capable of producing a pressure of 8 bar 120 psi with a. Motronic, featuring digital processing for numerous engine functions. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. This system features one centrally positioned fuel injection nozzle. The bosch l jetronic fuel injection systems used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Conventionally, the injection system of a diesel engine comprises a pump, a highpressure pipe, and an injection valve. 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. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued.
Small amount of air bypasses the throttle so the engine gets air and will idle. 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. Bosch licensed the concept to many automobile manufacturers. 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. Gasoline fuel injection system ljetronic bosch pdf.
A thorough understanding of the various components is required before working on k jetronic fuel systems. Bosch kjetronic fuel injection manual boschtech12d. Bmw e12 ljetronic fuel injection systems schematic. Bosch l jetronic fuel injection troubleshooting, maintenance. Each of the cars six fuel injectors press into a small rubber seal in. 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. Fi electronic fuel injection system electronic control. Fuel cut control in engine rotation speed over idol speed, fuel injection is stopped at idle throttle position. File type pdf workshop manual l jetronic sensor bosch l jetronic injection air flow meter bosch ljetronic overview inyeccion electromecanica kejetronic diy. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. Two papers were published in the bosch technical journal that gave overall descriptions of the d jetronic system.
While the general operating principles are the same, motronic offers more precise control over fuel and ignition events. Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it from newer. Combining this direct injection theory with electronic sensors, valves. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. The lele2lu jetronic system is a development of the earlier bosch l jetronic fuel injection system. Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. 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. The future will see increasing application of systems that inject the fuel directly. The bosch ljetronic system has a variety of sensors designed to signal the ecu electronic. Jetronic, lhjetronic, and motronic as an integrated engine management system. It is a good practice to insert a marine hand primer 5 in the output line going to the lb2912f. This page was last edited on 30 novemberat sequential fuel injection and knock control. Jun 17, 2019 ke3 jetronic pdf mercedes suggests that special tools are required to adjust the mixture on the bosch ke3 jetronic.
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. This manual can be viewed on any computer, as well as zoomed and printed, makes it easy to diagnose and repair problems with your machines electrical system. Pfi port fuel injection bosch port fuel injectors pfi have a robust design and are capable of using ethanol fuel e100. The bosch d jetronic is an electronical gasoline injection system which was introduced in 1967. This is an excellent book containing a detailed description of the l jetronic fuel injection system. Le is the german designation of the european version of their air flow meter, with lu being the designation. These early motronic systems integrated the spark timing element with thenexisting jetronic fuel injection technology.
Asynchronous injection is the function to perform compensation injection, when change of the intake air volume rapidly between the timings of synchronous injection. Number of bids and bid amounts may be slightly out of date. See pages 286292 for important safety, emissions and warranty information. Sequential fuel injection with hei and idle air control wide band oxygen sensing individual cylinder fuel and spark control options included 302111 302211 sequential fuel injection with dis and idle air control buick v6 30212300 30222300 sequential fuel injection with dis and idle air control individual cylinder fuel.
Bmw air flow meter testing video tutorial on how to testing and troubleshoot a bmw air flow meter which is the design of an early style mass air flow sensor. Ljetronic fuel injection systems for bmw e12s first fives. Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. Basic engine combustion process, combustion requirements, fuel delivery implementations, electronic fuel injection system components, l jetronic system, troubleshooting, conversion to lambda control, and performance. The ongoing development of the control unit and the sensors has led from the d jetronic to the ljetronic, and resulted in this fuelinjection system becoming. The manual aavs are for sale at the bottom of this page. I just purchased it with the computer brain and manifold. Bosch ljetronic fuel injection guide fiat fuel injected. Chapter of djetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. The primary pressure regulator that is installed in the fuel distributor housing maintains a constant pressure in the fuel system of the kjetronic. This fuel system has been used on lots of automobiles from the 1970s and 1980s.
The mixture formation system produces an air fuel mixture based on gasoline or a gaseous fuel, which is then drawn into the engine by the suction generated as the pistons descend. The l jetronic was the first massproduced, fully electronic fuel injection system. 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. 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. Bosch superseded the d jetronic system with the k jetronic. Free ebooks technical manual ljetronic fuel injection.
Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your area. The fuel injections system consist of throttle and idlewot switches. The following article discuss on l jetronic fuel injection systems for bmw e12 which covers following topics. Bosch fuel injector repair manual free pdf file sharing. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. 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. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Since its introduction, the kjetronic gasolineinjection system has pro. Free ebooks technical manual ljetronic fuel injection system. Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector all diesel engines use fuel injection by design. I am pretty lost as to all the connections, especially to the manifold itself.
Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. Basic engine combustion process, combustion requirements, fuel delivery implementations, electronic fuel injection system components, ljetronic system, troubleshooting, conversion to lambda control, and performance. The bosch ljetronic fuel injection systems used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Djetronic 19671979 analogue fuel injection, d is from german. Before troubleshooting, testing or adjusting the k jetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. Vw l jetronic fuel injection workshop manual created date. Singlepoint injection spi uses a single injector at the throttle body the same location as was used by carburetors. The lele2lu jetronic system is a development of the earlier bosch ljetronic fuel injection system. Sequential fuel injection with inductive pickup and twostage nitrous system capability wide band oxygen sensing and individual cylinder fuel and spark control options included 302211 30223211 sequential fuel injection with inductive pickup and idle air control 302300 30223300. Aug 16, 2019 ke3 jetronic pdf mercedes suggests that special tools are required to adjust the mixture on the bosch ke3 jetronic. The bosch fuel injector has a return rate of 1 part per million ppm, making bosch the industry.
The ow at a given point of the injection system changes as a function of time. Sep 18, 2019 ke3 jetronic pdf mercedes suggests that special tools are required to adjust the mixture on the bosch ke3 jetronic. L jetronic system pressure regulator n provides constant pressure across fuel injector valve n fuel 1 under pressure from fuel pump enters and pushes against valve holder 4 and spring 6 which opens valve 3 at regulated pressure. 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. 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. Feb 12, 2019 bosch digifant engine management system jetronic motronic. Today, it has been superseded by gasoline injection systems which thanks to. The mixture formation system produces an airfuel mixture based on gasoline or a gaseous fuel, which is then drawn into the engine by the suction generated as the pistons descend.
Dec 05, 2009 free ebooks technical manual l jetronic fuel injection system porsche 912e. Free ebooks technical manual ljetronic fuel injection system porsche 912e. The l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle l jetronic injection manual. Bosch digifant engine management system jetronic motronic. The following article discuss on ljetronic fuel injection systems for bmw e12 which covers following topics. The lejetronic system is electronically commanded and injects the fuel in the intake manifold. 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. Vw ljetronic fuel injection workshop manual created date. All bosch fuel injectors released to the aftermarket are oe fit, form and function, and are produced to oe specifications. 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. It started as a discussion of the l jetronic fi used on the 1. Gasoline fuel injection system l jetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your area. You are quite correct about l jet using the ignition points to tell the fi when to open the injectors.
Gtv6 and milano, however if you own any car with bosch ljetronic injection the article will still. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Please consult your local distributor for those items you may require. The ljetronic was the first massproduced, fully electronic fuel injection system. Fuel distributor systempressure regulator a usage list can be found in the tab dowloads.
Kjetronic is the term used by bosch to describe a fuel injection system which features continuous injection. Petrol engines can use gasoline direct injection, where the fuel is directly delivered into the combustion chamber, or indirect injection where the fuel is mixed with air before the intake stroke. Haynes diagram is good, but owners manual shows more. Can anyone provide a pdf or file on the jetronic fuel injection. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. Le is the german designation of the european version of their air flow meter, with lu being the designation of the us version, i. 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. Bosch developed many more types of electronic fuel injection after d jetronic l jetronic, k jetronic, etc. 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. Ljetronic fuel injection technical troubleshooting article.
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. I saw the pdf on this site for the conversion, thanks that will help, but i. 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 k jetronic fuel injection manual pdf document. There are several variations of the technology offering technological development and refinement. Ljetronic is the term used by bosch to describe a fuel injection system controlled by the air flowing through a sensor. 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. This manual describes the troubleshooting and repair of vehicles with the. Bosch ljetronic fuel injection troubleshooting, maintenance. Vw l jetronic fuel injection workshop manual author. In 1970, the isuzu 117 coupe was introduced with a boschsupplied djetronic fuel injected engine sold only in japan.
Bmw e12 ljetronic fuel injection systems schematic diagram. Robert bosch ljetronic efi system using mostly common workshop tools. Ljetronic electronic fuel injection only 530i 528i. L jetronic adventure injectors not firing pelican parts. 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. Vw ljetronic fuel injection workshop manual author.
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