This solenoid is a simple threeport device that takes one feed from the turbochargers compressor 3. 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. A thorough understanding of the various components is required before working on kjetronic fuel systems. The combination of the two systems makes it possible to obtain both economy and performance, while minimizing exhaust emissions. I am also addressing the basic settings involved in adjusting the fuel mixture here. The mixture preparation system meters fuel to correspond with the amount of intake air. 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. The technical instruction bookletfuel injection continuous injection system cisat the back of the manual describes the components and operation of the k jetronic fuel injection system in detail. Mechanical fuel injection bosch k jetronic, bosch k jetronic fig. The le jetronic system is electronically commanded and injects the fuel in the intake manifold. Electrical and vacuum operated regulators and switches complete the assembly. Bosch l jetronic fuel injection troubleshooting, maintenance.
Ljetronic the bosch ljetronic also called afcair flow controlled fuel injection was put into usspec type 4s in the last model year 1974. The average system pressure on all k jetronic fuel systems should be 520 kpa. As the engine warms and the wur is heated, the pressures increase, leaning the fuel mixture. Having trouble with bosch kjetronic cis bob is the oil guy. The k jetronic system was installed as original equipment in series production vehicles in the years 1973 through 1995. Jaguar had asked lucas to extend bosch d jetronic fuel injection system for 12 cylinder engines.
As time marched on and emissions requirements became more. Originally, volkswagen adapted the l jetronic for the type 4 air cooled 411 engines sold in the united states due to more. The details in this file refer to ke jetronic 19841987 on the us coupe and 4k the 1987. L jetronic electronic fuel injection only 530i 528i. The warmup regulator, also called the control pressure regulator, lowers the control pressure of the k jetronic when the engine is cold. The basic function of the ke jetronic system is to meter fuel to the engine dependent upon the quantity of air drawn in by the engine which is the main actuating variable. These fuel injection systems were considered to be really reliable and trustworthy. Detach the operational relay set from the relay block as well as from the safety appliance located under the steering tube. 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. This synthesis, comprising the mechanical basic functions coupled with electronic adap tation and opti mization functions, is the kejetronic. Lucas therfore developed d jetronic further for 12 cylinder engines. Description and operation kejetronic cise injection system. With the k jetronic, the preparation is performed by the mixture control unit which consists of a fuel distributor and an airflow sensor.
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. This further deflects the control plunger in the fuel distributor and correspondingly supplies additional fuel. Contents 1 d jetronic 2 k jetronic 3 k jetronic lambda jetronic is a trade name of an fuel injection technology for automotive petrol. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. All of the air drawn in by the engine flows through the airflow sensor. The l jetronic is an electronically controlled fuelinjection system. The testarossa when released in 1984 was fitted with the bosch k jetronic fuel injection system. K jetronic fuel injection system k jetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. The main difference between the two types is that on the. If it is not, you will only cover up faults and get yourself into trouble. It was a very clever system, which could compensate for variables like engine temperature and air density without the use of electronics. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Bosch ke jetronic continuous injection system mechanical fuel injection overview part 1of 6 fuel injection system bosch cise 1986 fuel systems mercedesbenz cise electronic control system description the fuel injection system used on. The bosch k jetronic fuel injection system is a continuous fuel injection system which consists of mechanical type fuel injectors, a fuel distributor unit, operated by a sensor plate, and a control valve.
Robert bosch gmbh, 2000 postfach 30 02 20, d70442 stuttgart. Ke jetronic troubleshooting for most pre1991 manufactured w124s, the fuel injection system on these engines are mostly using bosch ke jetronic. Bosch le jetronic bmw copyright equiptech boschlejetronic thereismuchconfusionabouttheactualtypeofinjectionsystemfittedtomanybmwmotorcarsduringtheperiod1980to. Before troubleshooting, testing or adjusting the kjetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. The key is to advance the timing to the peak power point. The mechanical portion of the cise system consists of the mixture control unit air flow meter and fuel distributor, primary pressure regulator, fuel accumulator, cold start valve, fuel injectors, pumps, filter, lines, tank and fuel. Diagram a e ledronic contrl unit and oxygen sensor.
This manual will describe the k jetronic s function and its particular features. Bosch ke jetronic system the bosch ke jetronic fuelinjection system is fitted to escort rs turbo models and is a further development of the k jetronic system. Ke jetronic a gasoline injection system must inject precisely the correct amount of fuel for the various operating conditions. A mechanical hydraulic injection system provides the basis for the bosch kejetronic cise fuel system. The wur lowers fuel pressure in the cis system when cold, causing a richer mixture. Now let us have a look how bosch ke jetronic fuel injection system can be diagnosed and repaired on an example of audi 100 2. What is most interesting is that lucas is more popular on the racing vehicles while bosch has developed those very first injection systems for diesel engines. Later they developed their own digital system p with a 35 pin conector. Bosch l jetronic l jetronic rx7 brought to you by the team at created date. 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. In this type of system each cylinder has its own injector discharging fuel into the area directly in front of the intake valve. Bosch cis lambda fuel injection system diagram this illustration is typical of all models. Bosch k jetronic with these systems, the fuel is delivered in. Ljetronic system throttle and idlewot switches idle switch is used for coasting fuel cutoff on later modelse12 79 81.
Troubleshooting symptoms k jetronic is a mechanical system. Ke jetronic fuel mixture adjustment in the mid 1970s, robert bosch gmbh developed a mechanical fuel injection system called k konstant jetronic. The bosch ke jetronic fuelinjection system is fitted to escort rs turbo models and is a further development of the k jetronic system. The system is sparing in comparison to carburetor, in case all the required service is provided. Since this point, the k jetronic has now become particularly important with regard to maintenance and repair. Wealso didntknowthatthesystemwould evolve into electronically controlledversions suchas klambda and ke. D jetronic was a precursor of modern common rail systems as it had constant pressure fuel delivery to the injectors and pulsed injections, albeit grouped 2 groups of injectors pulsed together rather than. Bosch, 39 pages qr code for benzineinspritzsystem k jetronic. Though mostly mechanical in nature and lacking the feedback o2 sensor to correct the airfuel mixture, it was considered sufficient in providing the control of the injection of fuel back in the days. Home video course bosch ke3 jetronic 539 89 injection system manual 328 mondial read online available as pdf.
When lucas enhanced the d jetronic amongst others system they added 2 components that original d jetronic. The injection has as function to provide the amount of fuel exactly dosed, necessary to. Originally, this system was called jetronic, but the name d jetronic was later created as a retronym to distinguish it from newer. L jetronic fuel injection systems for bmw e12s first fives kugelfisher 2002tii. In the case of the l jetronic, the amount of air drawn in by the engine is directly measured by an airflow sensor. The k jetronic pump requires no form of drive and one of its features is that it can meter the fuel as a function of the intake air quantity.
Bosch ke jetronic continuous injection system mechanical fuel injection overview part 1of 6 fuel injection system bosch cise 1986 fuel systems mercedesbenz cise electronic control system description the fuel injection system used on all mercedesbenz gasoline engine vehicles uses. A thorough understanding of the various components is required before working on k jetronic fuel systems. Originally, this system was called jetronic, but the name d jetronic was later created as a retronym to distinguish it from newer versions. In 1988 this was upgraded to the new ke jetronic system with elements of electronic control added. Tuning ke jetronic the stock timing on my car is now a matter of speculation. Diagnosing and oomchng faults the workshop procedure number given before the title of the operation refers to the fault diagnosis chan for the basic ku jetronic system given in. Bosch k jetronic fuel injection manual linkedin slideshare. This is to be found under the dash on the drivers side, above the bonnet release handle along with a few other relays. Electronically controlled fuelinjection systems are dealt with in detail in the publication electronically controlled fuel injection in the bosch technical. Whereas the increase in engine power was the main object at the start of development work on gasoline injection, today we are spurred on by the.
Bosch k jetronic mechanical fuel injection troubleshooter. The injection system never lacks nozzles you can modify and tune it the way you want if you do know how to set it up. Mechanical injection systems the k jetronic system operates by injecting continually, without an external drive being necessary. Diagnosing and oomchng faults the workshop procedure number given before the title of the operation refers to the fault diagnosis chan for the basic ku jetronic system given in figure 63 21. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. The advantages of ke jetronic include the following issues. Using the lambda sensor together with additional equipment for the lambda closedloop control facility, the k jetronic can already comply today with the exhaustgas regulations of tomorrow. Gasolineinjection 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. If the inlet air temperature sensor fails its resistance tests, you cant service just the sensor. A4 ignition and gasolineinjection systems from bosch ignition and gasolineinjection systems from bosch more than a century of system expertise l jetronic components ke jetronic components motronic components renowned vehicle manufacturers rely on bosch as original equipment supplier and thus form the basis for a fruitful replacement. 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 gasolineinjection system has proved itself in millions of 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. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system.
Since i am running the 2144 block with a turbo camshaft and a ke fuel system none of which were made to go with each other who knows how close i could get to california before the sirens go off. Bosch ke3 jetronic 539 89 injection system manual 328 mondial to read online or download as pdf. Onsomel jetronic systems, the air temperature sen sor is visible in the air flow meter inlet. But wedidnt anticipate the ravages offuel con tamination. When switch is closed throttle closed, fuel is cut until engine rpm drops below ecu. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. The bosch k section will be of most use to xr owners but will also benefit the rs turbo owners. Someofus rememberthedayswhenwelookedat this systemand thought servicingthis willbeabreezethesystems almost entirely mechanical. Automotive equipment business sector, department for automotive services, technical publications khpdi2.
The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which. Bosch k jetronic fuel injection manual pdf document. The primary pressure regulator that is installed in the fuel distributor housing maintains a constant pressure in the fuel system of the k jetronic. The ke section will be of more interest to those with escort rs turbos as your cars needed the electronic enrichment system specific to ke, mainly to cater for forced induction. Turbochargertomanifold nut check rs turbo models every 12 000 miles or 12 months check the tightness of the turbochargertoexhaust manifold securing nuts using a torque wrench. Representative examples are the various versions of the ke and l jetronic systems figure 1. 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. Troubleshooting symptoms kjetronic is a mechanical system. The lambda system is a feedback control capable of measuring airfuel ratios and constantly correcting them. By the way, only two companies, bosch and lucas, have developed almost all of the various fuel injection systems. Gasolineengine management gasoline fuelinjection system k jetronic technical instruction published by.
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