K jetronic was used for many years between 1974 and the mid1990s by bmw, lamborghini, ferrari, mercedesbenz, volkswagen, ford, porsche, audi, saab, delorean, and volvo. L jetronic is the term used by bosch to describe a fuel injection system controlled by the air flowing through a sensor. Bosch developed many more types of electronic fuel injection after d jetronic l jetronic, k jetronic, etc. D some of these have thin spots from rubbing on other parts. Fuel pressures fuel pressure with fuel pump jeetronic. Bosch l jetronic fuel injection troubleshooting, maintenance. The electrical supply to all of these components is controlled by the control relay which itself is switched by the ignitionstart switch. There is so much mystery surrounding the cis continuous injection system fuel system bosch has dubbed k jetronic, i wanted to try and make some sense of it for all porsche owners. The average system pressure on all k jetronic fuel systems should be 520 kpa. Tuning and adjusting cis fuel injection pelican parts. I would prefer to just lift the system from one car and drop it in the other.
Download bosch k jetronic fuel injection manual download document. Bosch k jetronic fuel injection manual download pdf. Somethingas simple as testing fuel pressures requires an under standing of howthe system controls fuel pressure and mixture. It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. Ive only really messed about with k lambda, and dont know much about ke jetronic, but i suspect that the k lambda control box would be very easy to replicate, if there was some way to determine the control parameters after all, i believe the only inputs are the o2 sensor, coolant temperature to select between warmup and closedloop. 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. Rwd kjetronic flooding even with correct fuel pressures. This further deflects the control plunger in the fuel distributor and correspondingly supplies additional fuel. Bosch k jetronic and ke jetronic fuel injection volvo owners club. K jetronic fuel systems have an electric safety circuit which prevents the. This is how the moving part should look like in rest position.
Bosch cis fuel injection age related issues with kent. 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. Bosch k jetronic fuel injection manual pdf document. It is a euromarket 1979 280ge lwb with a manual transmission. Detach the operational relay set from the relay block as well as from the safety appliance located under the steering tube. For more than ten years, porsche used the bosch k jetronic continuous injection system cis on all production 911s. 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 almost crude fuel delivery system, to the recent mass produced versions of the bosch k and ke jetronic. It has the m110 engine fitted with bosch k jetronic fuel injection and it doesnt have an oxygen sensor. I can get my hands on a k jet 280se donor car as we speak but dont want to waste my time if the hardware is not usable. Then tested and calibrated to manufacturers original specification.
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. Mar 02, 2012 bosch k jetronic fuel distributor seal. Robert bosch gmbh, 2000 postfach 30 02 20, d70442 stuttgart. With the kjetronic, the preparation is performed by.
Verify that these systems are in proper working order before proceeding further. This is an inline pressure tester which indicates problem sources control pressure regulator, fuel distributors or other specific fuel injection components that may require replacing. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed. It is quite straightforward in its operation, providing diagnosis and testing is acrried out logically and one step at a time.
Vw l jetronic fuel injection workshop manual author. If i replace the preasure control unit, the line will end up being too short. Attach pressure gauge line 3 or b to cold start fitting on fuel distributor upper chamber. The kjetronic system was installed as original equipment in series production vehicles in the years 1973 through 1995. Purely mechanical injection systems are unable to comply with these farreaching stipulations. Wewill give you a brief overview of the system and its functions, then show you the tools and techniques that are required to test the. Engine temperature has no effect upon system pressure test. E21 3er 323i models are equipped with the bosch k jetronic system, whereas e30 3er 320i and 325i models are fitted with the bosch l jetronic system. Since its introduction, the kjetronic gasolineinjection system has pro ved 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.
Bruce, i am getting the specs from the haynes volvo 240 series service manual and volvo fuel injection green book. Having recently sorted out a problem with mine, and hopefully understanding its. Playing with your k jetronic warm up regulator, or wur. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Continuous injection system found on european cars and volkswagen models assembled in the u. The system is used in conjunction with a turbocharger on rs turbo models. Two papers were published in the bosch technical journal that gave overall descriptions of the d jetronic system. By the way, only two companies, bosch and lucas, have developed almost all of the various fuel injection systems. 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. In engineering terms, the k jet has a very good mean time between failure, but a horrific mean time to repair. Automotive equipment business sector, department for automotive services, technical publications khpdi2. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. K jetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc.
The l jetronic is an electronically controlled fuel injection system which has the advantage of direct air flow sensing. Bosch ljetronic and motronic fuel injection systems repair guide. K jetronic is the term used by bosch to describe a fuel injection system which features continuous injection. Bosch k jetronic mechanical fuel injection troubleshooter. The most common automotive continuous injection system is bosch s k jetronic, introduced in 1974. The purpose of the engine running sensor is to inhibit the supply of power to the fuel pump unless the engine is running. The l jetronic was the first massproduced, fully electronic fuel injection system. This video its no mine but i had to put in my channel due i want to help some people to fix the most common problem the poor acceleration in the porsches 924 if someone wants help send a pm btw. Kjetronic flooding even with correct fuel pressures 200 1979. Remove fuel supply line for cold start valve from top of fuel distributor.
Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system k jetronic was installed as original equipment in seriesproduction vehicles. The engine is pretty young, as it only has about 60,000 kms. I hope i have covered all the problem areas and lifted some of the mist surrounding this system. 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. Testarossa fuel ke jetronic fuel injection system the testarossa when released in 1984 was fitted with the bosch k jetronic fuel injection system. Bosch kjetronic fuel injection systems volvo owners club. Metered fuel through a mechanical injector, continuous flow. These fuel injection systems were considered to be really reliable and trustworthy. The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which. Having trouble with bosch kjetronic cis bob is the oil guy.
Bosch kjetronic fuel injection part 2 volvo owners club. Gasoline fuelinjection system kjetronic pdf download. Kmi service exchanged k jetronic fuel distributors are carefully remanufactured by our technicians. The mixture preparation system meters fuel to correspond with the amount of intake air. This synthesis, comprising the mechanical basic functions coupled with electronic adap tation and opti mization functions, is the kejetronic.
Gasoline fuel injection system k jetronic tions since this point the k jetronic has now become particularly impor tant with regard to maintenance and repair this manual will describe the k jetronic s function and its particu lar features would you like some free manuals. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. Is the k jet back end hardware for a m110 the same as the m117 or is the fuel pump and accumulator different because one is for a v8 rather than the 6. Kjetronic is the term used by bosch to describe a fuel injection system which features. In the case ofthe bosch cise fuel injection sys tem,thereis morethanmeets the eye.
This is basically the k jetronic fuel injection system. Especially fuel injection and ignition was my soecial interest since i bought my fist oldtimer in 2007, a mercedesbenz 450 sl from 1973. The system in general is very reliable, and was only bested in 1984 by the introduction of the motronic engine management system that controls both ignition and fuel injection together. Gasoline fuel filter fuel filter injection the fuel filter retains par. This is to be found under the dash on the drivers side, above the bonnet release handle along with a few other relays. The bits of the system include the fuel pump, prepump on some models, fuel filter, accumulator, fuel distributor, warm. Combining this direct injection theory with electronic sensors, valves. The bosch l jetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow.
The k jetronic is a mechanical system in which the fuel is constantly metered on the basis of the volume of air drawn in by the engine. Please consult your local distributor for those items you may require. This development was a direct result of the advantages. This little goody is a common culprit in k jet or cis problems, along with pumps, oneway valves, accumulators and fuel distributors. The k jetronic was used as original equipment in massproduced vehicles between 1973 and. Electrical and vacuum operated regulators and switches complete the assembly. The mechanical k jetronic, which had already proven itself as a multipoint fuel injection system, was therefore re. 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. The bosch d jetronic is an electronical gasoline injection system which was introduced in 1967. Gasoline injection systems k jetronic further technical information can be found in the k jetronic booklet.
Troubleshooting symptoms kjetronic is a mechanical system. Commonly called continuous injection system cis in the usa. Bosch k jetronic fuel injection manual linkedin slideshare. L jetronic system fuel injectors n open when energized by ecu not continuous as k jetronic. Assuring you of quality and reliability at a cost effective price. The k jetronic is a mechanical system in which the fuel is continuously metered in accordance with the amount of air drawn in by the engine. Bosch ke3 jetronic 539 89 injection system manual 328 mondial to read online or download as pdf. 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. Mechanical fuel injection bosch k jetronic, bosch k jetronic fig. Fuel management carried out by the mixture control unit. 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. 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 k jetronic system is equipped with a number of electrical components, such as electric fuel pump, warmup regulator, auxiliaryair device, start valve and thermotime switch. 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. Flow testing a bosch cis k jetronic fuel injection system from a 1984 mercedes 380sl. Engine running wnser and fuel pump inhibit see figs. This article covers k jetronic injection for e21 models, also injected e12 and early e28 5er. In 1988 this was upgraded to the new ke jetronic system with elements of electronic control added. Kjetronic is different from pulsed injection systems in that the fuel flows continuously.
It differentiates from the le jetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit. Gasolineengine management gasoline fuel injection system k jetronic technical instruction published by. 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. I followed my scientific curiosity to discover every special subject on bosch s d jetronic and today i consider myself a specialist on that. The mechanical fuel injection system has recently been overshadowed by. Kjetronic fuel injection system k jetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. Vw l jetronic fuel injection workshop manual created date. The warmup regulator, also called the control pressure regulator, lowers the control pressure of the k jetronic when the engine is cold. 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.
Chrysler used a continuous fuel injection system on the 19811983 imperial. Gasoline fuel injection system k jetronic pdf download this shop manual may contain attachments and optional equipment that are not available in your area. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. Nov 21, 2009 supply system, there is always cool fuel fig. Sinds it is a horror story to replace this thing on a 8. Where can i buy the plastic fuel line material the preasure control line is. K jetronic debuted in the the volume j air taken in by the engine is measured to determine the amount of fuel to inject. Home video course bosch ke3 jetronic 539 89 injection system manual 328 mondial read online available as pdf. Bosch ke jetronic manual bosch k jetronic manual mercedes bosch k jetronic service manual bosch ke jetronic workshop manual bosch d jetronic fuel injection manual manual k jetronic l jetronic k jetronic le jetronic k jetronic german k jetronic deutsch bosch fsa 740 using manual bosch manual bosch manual. Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation.
The task of a fuel injection system is to supply precise amount of fuel to the combustion chamber at that particular moment. Jetronic is a trade name of a fuel injection technology for automotive petrol enginesdeveloped and marketed by robert jetrnoic gmbh from the s onwards. The electric fuel pump delivers more fuel electric fuel pump kje. Today, it has been superseded by gasoline injection systems which thanks to.
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