We carry many efi systems many selftuning and selflearningfrom the top players in engine performance, including msd ignition, edelbrock, holley, fast, accel, chevrolet performance, quick fuel, and more. Bosch l jetronic fuel injection troubleshooting, maintenance. The latter is the simpler of the 2 systems and controls the fuel rail to a constant pressure via a nonvacuum referenced regulator in the tank, which is typically set to 55 psi. Many of them use a fuel pump essentially identical to the carbureted fuel systems. In 2003, evinrude introduced the etec system, an improvement to the ficht fuel injection1 basic principles of operation and applications of fuel injection systems in petrolpowered cars. How to get water out of a fuel system it still runs. This can be bad not only for getting the car started, but it can rust important parts if goes through the fu.
Replace a mechanical fuel injection system on 1981 vw rabbit diesel bosch ve. Electronic fuel injection efi system uses electrical and electronic devices to monitor and control engineoperation. Properly selecting electronic fuel injection components one of the more commonly misunderstood aspects of electronic fuel injection efi is how to select the correct size. Bosch ljetronic l jetronic rx7 brought to you by the team at created date. 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. In this video, we test our black box fuel enrichment control device on an alfa romeo gtv6. Fuel injection bosch djetronic and ljetronic ecgi part2. Since then, fuel injectors have been the primary means of getting gasoline into the engine cylinder so it can combust and you can drive. Ljetronic fuel injection system operationa pump supplies fuel to the engine and creates the pressure necessary for injection.
This system features one centrally positioned fuel injection nozzle. Page 20 ljetronic system diagram the next diagram is a schematic drawing of the complete ljetronics fuel injection system. Vw ljetronic fuel injection workshop manual author. Combining this direct injection theory with electronic sensors, valves. Gasolineengine management gasoline fuelinjection system k. The most important unit in the ecgi system is the electronic control unit ecu which is re sponsible for metering the fuel quantity.
This system can be divided into three basic sub system. It is important to occasionally clean your fuel injector with fuel injection cleaner. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. Inlet manifold vacuum is measured using a pressure sensor located in, or connected to the intake manifold, in order to calculate the duration of fuel injection pulses. Components o2 sensorn o2 sensor measures excess oxygen in exhaust gas. Left in the open air, organisms will eventually decay through bacterial action, and desiccate oxidize to dust in the presence of air. Gasoline injection systems gasoline injection systems carburetors and gasoline injection sys representative examples are the various tems are designed for a single purpose. Failure to start fuel pump is a common problem on ecus. 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.
Injection valves inject the fuel into the individual intake tubes. Gasoline fuel injection system monojetronic has 1 available editions to buy at alibris. Everyone knows that you put fuel into the tank to keep the car running. The heart of this system is the airflow meter, which measures the amount of air being required by the engine. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. Please consult your local distributor for those items you may require. Electronically controlled gasoline fuelinjection system with. Before troubleshooting, testing or adjusting the kjetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc.
Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. The fuel system is vital in storing and delivering the gasoline, or diesel, that an engine needs to run. By controlling both major systems in a single unit, many aspects of the engines characteristics such as power, fuel economy, drivability. Components of a direct injection fuel system the components of a direct injection engine differ from gasoline engines. 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. Gasoline injection systems overview 10 kjetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaust gas treatment 32 electrical circuitry 36 workshop testing techniques 38 kjetronic since its introduction, the kjetronic gasoline injection system has pro. 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. Gasoline fuel injection system ljetronic bosch pdf. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations.
The bosch l jetronic fuel injection system used in the porsche 912e is often. Beginning in 1982 for the spider, and 1981 for the gtv6, alfa adopted bosch ljetronic fuel injection. For those not familiar with bosch ljetronic fuel injection you may want to start with l jetronic seminar in pdf format. Now measure resistor of fuel pump relais between pin 19 and pin 16. All bosch fuel injectors released to the aftermarket are oe fit, form and function, and are produced to oe specifications. Most of these systems were rendered obsolete by the commonrail direct injection system that is nowadays 2020 used in many passenger cars. Rough engine idle, speed adjustment idle, and exhaust gas test. Pfi port fuel injection bosch port fuel injectors pfi have a robust design and are capable of using ethanol fuel e100. The items of information needed for this are collected by transducers pressure sensors, temperature sen sors, etc. Learn about the components of a direct injection engine at howstuffworks. Bosch k jetronic cis explained youtube mar 01, 2012 this feature is not available right now. To keep people from accidentally fueling up a diesel engine with gasoline, most diesel fue.
Modifying bosch ljetronic fuel injection the black box. This can increase fuel delivery and offer mod or performance sup. 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. Electronic control fuel injection system based on gtpower and mototron. Bosch kjetronic part 1, the basics tastes like petrol. Bosch developed many more types of electronic fuel injection after djetronic ljetronic, kjetronic, etc. L jetronic fuel injection systems for bmw e12s peter florance introduction n this seminar will describe the l jetronic system fitted on e12s n it will also cover trouble shooting and performance tips seminar topics n basic engine combustion process n combustion requirements n fuel delivery implementations n electronic fuel injection system components n l jetronic system n troubleshooting.
By controlling both major systems in a single unit, many aspects of the engines characteristics such as power, fuel economy, drivability, and emissions can be improved. Bosch k jetronic cis explained youtube mar 01, 2012 this. Domestic carmakers adopted electronic fuel injection extensively on breadandbutter production cars in the early 80s. Diesel fuel injection diesel fuel injection systems can be tricky. This dives right into replacing a mechanical fuel injection system on a 1981 vw diesel rabbit with a 1. Take a technological leap forward with a new electronic fuel injection system from summit racing. Gasoline fuel injection system kjetronic pdf download this shop manual may contain attachments and optional equipment that are not available in your area. Find out about diesel fuel injectors, the diesel furl injection process and the variables that affect diesel fuel injection. Spec alfa romeo gtv6s, milanos, and 19821989 spiders, bmw e12 5 series and various 3 series cars, the datsun 280z and 280zx, all u.
The earliest bosch installations were the djetronic and ljetronic systems, and we can still find their operating principles at work in vehicles for the 2001 model year. Gasoline is basically just dead things that got buried before they had a chance to get eaten. Apr 11, 2016 pdf gasoline fuel injection system ljetronic. In more elaborate terms, kjet is a continuous injection system commonly called cis, where unlike later ljetronic or standard electronic fuel injection, the injectors do not pulse open and closed. This diagram was adapted from the porsche 912e workshop manual and has been enhanced to provide additional information to assist in isolating fuel injection problems. Gasoline fuelinjection system kjetronic pdf download. Your fuel injector can become clogged up with deposits lef. Introduced first on california bound vehicles and, by 1981, on all u. All internal combustion engines require air, fuel and a spark to run.
This article focuses on fuel injection in reciprocating piston and rotary piston engines. Until 1996, this fuel injection system was installed as an independent system in seriesproduction vehicles, and in this. The last carburetorequipped car came off the assembly line in 1990. L jetronic fuel injection systems for bmw e12s peter florance introduction n n this. Licensing some of boschs ljetronic concepts and technologies, lucas, hitachi automotive products, nippondenso, and others produced similar fuel injection systems for asian car manufacturers. Mar 01, 2016 approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Originally, this system was called jetronic, but the name djetronic was later created as a retronym to distinguish it from. These fuel injection systems were considered to be really reliable and trustworthy. Representative examples are the various versions of the ke and l jetronic systems. Vw ljetronic fuel injection workshop manual created date. Ljetronic fuel injection systems pdf document fdocuments. The ljetronic was the first massproduced, fully electronic fuel injection system.
Pdf investigation of fuel injection system of internal. Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. All diesel compressionignition engines use fuel injection, and many otto sparkignition engines use fuel injection of one kind or another. Efielectronic fuel injection systems at summit racing.
Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel. Efi contains engine sensors, a computer, and solenoid operated fuel injectors to meter and injects the right amount of fuel into the engine cylinders. Your fuel injector can become clogged up with deposits left behind from fuel and its additives. 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. By this arrangement not only the absolute pressure in the intake manifold is. Learn what burning straight gasoline will do to a diesel engine. If you accidentally put gasoline into your dieselfueled vehicle, you will be sorry. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. When you cannot hear a 2 second humming from your fuel pump after switchwing on ignition, measure whether pin 19 against pin 16 goes to 0v for 2 seconds after switching on ignition. Pdf electronic fuel injection system electronic fuel. Djetronic 19671979 analogue fuel injection, d is from german. Ljetronic manufactured under license by japan electronic control systems was fitted to the 1980 kawasaki zh1, the worlds first production fuel. But have you ever stopped to think about how the fuel gets from the fuel tank into your engine.
Electronically controlled gasoline fuelinjection system. Gasoline fuel injection system mono jetronic gasoline fuel injection system monojetronic by robert bosch starting at. Check voltage input to fuel pump relay of relay set. Bosch ljetronic fuel injection troubleshooting, maintenance. Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. In practice an ideal fuel injection system does not exist, but there is a huge variety of different fuel injection systems with certain advantages and disadvantages. Although fuel systems vary depending on vehicle model, their func. Motronic is the trade name given to a range of digital engine control units developed by robert bosch gmbh commonly known as bosch which combined control of fuel injection and ignition in a single unit. This was a microsoft powerpoint document, presented at the 1999 e12 fall fest in virginia beach, va. Bosch digifant engine management system jetronic motronic. How to add fuel stabilizer to gasoline it still runs. A thorough understanding of the various components is required before working on kjetronic fuel systems. Bosch technical instruction l jetronic pdf manufactured by the.
1134 911 1499 1086 1140 1104 886 1451 52 278 1334 1552 258 1348 845 650 1141 1620 485 683 1255 859 1405