Bosch kejetronic system description free download as pdf file. Jetronic controls fuel supply while the electronic ignition system provides optimal ignition control. Kejetronic a gasoline injection system must inject precisely the correct amount of fuel for the various operating conditions. Bosch k jetronic fuel injection manual pdf document. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the kjetronic system are unchanged on the kejetronic system.
As time marched on and emissions requirements became more. 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. Ke jetronic fuel mixture adjustment in the mid 1970s, robert bosch gmbh developed a mechanical fuel injection system called k konstant jetronic. 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. In 1988 this was upgraded to the new ke jetronic system with elements of electronic control added. There were three iterations of it in audis simplest kejetronic, with vacuum ignition or with electronic ignition, ke3jetronic equipped 10v. Kjetronic, is a system which has a control pressure regulator or on the ke models it is the electronically controlled pressure actuator which is used to change the counter line pressure of the metering pin inside the fuel distributor. The testarossa when released in 1984 was fitted with the bosch k jetronic fuel injection system. Mechanical injection systems the kjetronic system operates by injecting continually, without an external drive being necessary. Kejetronic 19851993 electronically controlled mechanical fuel injection. Contents 1 d jetronic 2 k jetronic 3 k jetronic lambda jetronic is a trade name of an fuel injection technology for automotive petrol. Fuel injection system the ke2jetronic fuel injection system is fitted to turbocharged engines. Bosch k jetronic and ke jetronic fuel injection volvo owners club. The bosch kejetronic fuelinjection system is fitted to escort rs turbo models and is a further development of the kjetronic system.
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. Detach the operational relay set from the relay block as well as from the safety appliance located under the steering tube. 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. R shoutd be noted that all components of the system except the injectors can be tested on the vehicle. This control allowed for faster fuel trim corrections through the use of sensor inputs like knock and oxygen. Bosch kjetronic and kejetronic mechanical fuel injection systems. Kjetronic troubleshooting from a couple of specialists. Bosch kejetronic system description fuel injection engines. Today, it has been superseded by gasoline injection systems. Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. Bdom mrrying out any te ensure that the battery h in r fully charged condkion. The details in this file refer to ke jetronic 19841987 on the us coupe and 4k the 1987. Home video course bosch ke3 jetronic 539 89 injection system manual 328 mondial read online available as pdf.
Instead of being determined by the injection valve, fuel mass is regulated by the fuel distributor. But wedidnt anticipate the ravages offuel con tamination. 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. A computer controls the injection and ignition systems with reference to shared optimization criteria. Kjetronic fuel injection system kjetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. Usa spec cars featured even more electronic controls in an attempt by bosch ferrari to comply with the strengthening emissions control introduced in. Digital data processing and microprocessors make it possible to translate extensive operating. Mechanical fuel injection systems first saw light of day at the turn of the century, however the following 100 years has seen the system evolve from a very basic and. Bosch, 39 pages qr code for benzineinspritzsystem kjetronic. The mixture preparation system meters fuel to correspond with the amount of intake air. The bosch continuous injection system cis is a hydraulictype fuel injection system which uses an air flow sensor, that is mechanically connected to a hydraulic valve, to control injection quantity. Kjetronic kejetronic fuel injection system repairs and. I am also addressing the basic settings involved in adjusting the fuel mixture here.
Representative examples are the various versions of the ke and ljetronic systems figure 1. The construction and opera tion of the kjetronic cis fuel injection system is different from other fuel injection systems. Wealso didntknowthatthesystemwould evolve into electronically controlledversions suchas klambda and ke. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more. 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. The air drawn in by the airflow sensor changes the position of the airflow sensor plate in the airflow sensor. For cold starts, the system used a separate injector. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. In this type of system each cylinder has its own injector discharging fuel into the area directly in front of the intake valve.
With the kjetronic, the preparation is performed by the mixture control unit which consists of a fuel distributor and an airflow sensor. Someofus rememberthedayswhenwelookedat this systemand thought servicingthis willbeabreezethesystems almost entirely mechanical. 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. It was a very clever system, which could compensate for variables like engine temperature and air density without the use of electronics. There are no further advantages, as i may consider. Before troubleshooting, testing or adjusting the kjetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. Gasolineengine management gasoline fuelinjection system kjetronic technical instruction. If it is not, you will only cover up faults and get yourself into trouble. Robert bosch gmbh, 2000 postfach 30 02 20, d70442 stuttgart. Pmcedum 1 fuel pump andor prepurnp not operating correctly.
All of the air drawn in by the engine flows through the airflow sensor. 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 key is to advance the timing to the peak power point. The lambda system is a feedback control capable of measuring airfuel ratios and. Later kejetronic systems used an electronic actuator that could control the pressure supplied to the fuel distributor. The trio of specialists helped me improve, refine, and verify my list of troubleshooting techniques for the kkejetronic system that we have on our 190es.
Now let us have a look how bosch kejetronic fuel injection system can be diagnosed and repaired on an example of audi 100 2. Apart from minor alterations the basic principles of the hydraulics and mechanics used on the kjetronic system are. The kjetronic 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. The main difference between the two types is that on the. A thorough understanding of the various components is required before working on kjetronic fuel systems.
The system is sparing in comparison to carburetor, in case all the required service is provided. The fuel system comprises a centrally mounted fuel tank, electricallyoperated fuel pump and bosch kjetronic or kejetronic continuous injection system. The advantages of kejetronic include the following issues. This solenoid is a simple threeport device that takes one feed from the turbochargers compressor 3. Bosch ke3 jetronic 539 89 injection system manual 328 mondial to read online or download as pdf.
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