k jetronic fuel mixture adjustment The first plug (without the valve) goes into the test port on the side of the fuel distributor. 3 Unscrew and remove the casing retaining nuts from the inner wing panel and lift out the casing. K stands for the German word for continuous; E stands for the German word for electronic. The Engine's Fuel Requirements A spark-ignition engine needs a particular air-fuel ratio in order to operate. 00). Warm up regulator 9. Specific steps for this adjustment are provided in Section 5. The warm-up regulator is used to move the plunger to allow more fuel when the engine is cold. 0L: 1975 - 1976: GC0 000 001 => GC0 006 946 "S" (intake - from fuel tank, large outlet), "R" (return - to fuel tank, small tube). Guide Special Tool 9187 into adjusting bore of heated wire air flow sensor and turn idle speed potentiometer accordingly. My main hunch at this point is a vacuum leak somewhere. fast tech / tech / Bosch K/KE JEtronic inJEction / This month Stu starts his series looking at Bosch K/KE Jetronic fuel injection. A means of adjusting the mixture is provided by an allen screw, situated in the lever assembly. D-Jetronic ECU was the first (commercially successful) injection to automatically adapt to engines load and revolutions to always give best performance, torque and least emissions and fuel consumption. Than turn back a bit until it stops (or some fraction of a turn, including having it stop). ? . Golf Mk1 > Volkswagen Workshop Manuals > Power unit > K-Jetronic/Ignition system > Mixture preparation system, mechanical injection > K-jetronic injection system > Servicing K-Jetronic injection system I have been studying the Bosch K-Jetronic Tech manual and have some questions . ) Neverattempt to separate the twohalves ofa fuel distributor for cleaning. Fuel distributor 5b. Turning counterclockwise = leaner mixture. Fuel Pump Relay. Regards Alex - Answered by a verified UK Auto Mechanic We use cookies to give you the best possible experience on our website. See pages 145-150 of the Fuel and Emissions book (book 2) for full info, but I have an excerpt below: Re: K-Jetronic Fuel Mixture Settings Post by Gti k jet » Thu Apr 26, 2018 8:18 pm Howzit guys i have a golf 2 gti 8valve does anyone know in pta were i can go to. This basic adjustment alters the relationship af the air flow sensor plate position to the control piston in the barrel of the fuel distributor. The DMC Service manual has all the instructions needed for testing the fuel system. 7:1. Popular with Po Set the mixture at idle RPM with the allen key adjustment on the fuel distributor as you've suggested (turning to right makes it rich), you may have to go back and adjust idle air to get idle RPM where it's supposed to be. Guide Contents: Engine fails to start (cold or warm) Cold-start problems Hot-start problems Improper idle Uneven running Unsatisfactory performance Fuel consumption too high Appendix _ Note: All instructions marked apply only to vehicles up t o and including the 1975 model Characteristics: No over-run shut-off circuit, idle mixture adjustment knob present, five waveform generators in the speed control circuit. Make sure you remove the Allen key after each (tiny) adjustment before you rev The electric fuel pump delivers more fuel Electric fuel pump K-Jetronic than the maximum requirement of the 1 Suction side, 2 Pressure limiter, 3 Roller-cell engine so that compression in the fuel pump, 4 Motor armature, 5 Check valve, system can be maintained under all oper- 6 Pressure side. But I don't understand how K-Jetronic can get itself into a "too rich/flooding" fuel mixture as the control plunger , airflow sensor plate & arm are not sticking or jamming and I can feel the control pressure forcing the sensor plate down when I lift it. With a little playing, you should be able to note the point where between rich and lean the engine runs best. By turning this screw inward you are reducing the air flow, thus richening the idle mixture. The initial pressure is more or less equal to the number limited by the pressure regulator – 5 kg/cm². For early model cars using the K-jet (mechanical fuel injection) system, mixture adjustment is quite simple. As with just about everything else automotive, K-Jet didn't escaped change in the last decade. 2 @ 650 I would like to take the adjustment back a fraction ,this may get me down to 580 rpm& back to . Fuel filter 5a. This regulator is mounted on the engine and absorbs heat to determine when the engine is warm and adjust the fuel mixture. The 912E throttle valve switch does not provide an input to the electronic control unit during the idle load condition as previously found in the 914 1. Fuel accumulator 4. How to use this manual. K-Jetronic system Removal 1 Remove the air cleaner element as described in Chapter 1. (Most of the tips described here apply to all versions. Do not bend the steel type fuel lines. Some mixers also use spacers or shims to lean the fuel mixture. K-Jetronic Porsche Always use new gaskets, seals and 0-rings when installing components or fuel lines. A -To fuel injectors B -To warm up regulator C -From warm up regulator D -To cold start injector E -From fuel filter F -Return to Fuel injection -ern Chapter C Fuel system Chapter D Turbocharging system Chapter E Ignition. The Bosch L-Jetronic system is used on all U. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Turning clockwise = richer mixture. Injector - Mechanical valve that "pops" when the fuel pressure reaches approximately 45 psi (3 bar). The frequency valve adjusts the fuel mixture. 039 906 021 A 039 906 021 AU: 0 280 000 051, 052 CU16X: 2. 8L L-Jetronic Fuel Injection System. Normally, this is done to improve fuel economy with leaner fuel mixtures. Turn the screw as necessary until the correct CO reading is obtained, then if required readjust the idling speed. In the order of placement, the filter is located immediately after the fuel accumulator. Bosch K-Jetronic Fuel Injection Part 1. This month, it's time to concentrate on tests and adjustments of the system. 2 Detach the fuel filter from the side of the cleaner casing (leave the fuel lines attached to the filter) and the air inlet hose from the front end of the case. The voltage divider implemented with the potentiometer sets the PL threshold level. If the idle mixture adjustment screw is located behind the carbs slide tower (airbox side) then the adjusting needle regulates air flow into a fixed flow of fuel intended for idle. Fuel/Ignition Systems Adjust an early K100 Throttle Cable - Tom Coradeschi (July 1994) Adjusting the L-Jetronic airflow meter on a 2-Valve K-bike - Rob Lentini Backfires - Rob Lentini, Paul Glaves (September 1995) Change the Fuel Filter - Bob Anundson (August 1995) Fuel Injection Pressure Measurement - Clarence Dold (March 1999) Title: VW L-Jetronic Fuel Injection Workshop Manual Author: Robert Bosch Keywords: VW L-Jetronic Fuel Injection Workshop Manual Created Date: 1/23/2006 12:00:00 AM It does this by adjusting the opening clearance of the individual differential pressure valves in the fuel distributor rather than adjusting the resistance pressure on top of the piston. The air-fuel ratio KE-Jetronic Fuel Injection PART TWO Last month we showed you how milliamp read- ings sent by the control unit to the DPR control fuel delivery to the injectors. Air sensor 5c. This screw acts directly on the pivot for the sensor plate and raises or lowers the height of the plate. 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. The electronic control unit evaluate to the signals which are required physical changes of the mixture. Can someone please tell me when adjusting the mixture [ I have the special tool for k - jetronic ] is clockwise turn to LEAN the air fuel ratio: and is counter clockwise to RICH the air fuel ratio. See also K_Jetronic for additional info. The port throttles of course will greatly enhance throttle response. Not only will too rich a mixture waste fuel but too lean a mixture produces less power per engine cycle and ends up consuming more fuel per mile. Whenever work is performed on the fuel injection system, the idle and CO must be adjusted. 7 (lambda at 1. 1. The CO tester only tells you one thing. My Porsche utilizes the Bosch Jetronic Fuel Injection system. 8i XR4x4s, whereas the Bosch KE system is fitted to all Escort RS Turbos. 7:1 air to fuel by weight) than could possibly be achieved mechanically was needed. Adjusting the basic settings on KE Jetronic requires a CO meter, really, but you can get things set without one. Adjusting the system pressure on the fuel metering device, adjusting the control pressure making a hole on the warm up valve and using the hidden allen key. There is also a 12V power socket on the top of Approximately up until 1994 mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc. Idle speed, mixture and timing were adjusted following new injectors and rebuilt WUR to run great when warm and idle at 950 - its at cold start and cold running where the issue is. One procedure to set the mixture after having everything apart is to crack one of the injector lines, and with the fuel pump running, turn the mixture screw clockwise until fuel starts to start coming out of the loosened fitting. With the electronics disconnected, this system will operate as a K-Jetronic system. Turn it counterclockwise to lean it out. 23 Insert the Allen key into the mixture screw tube and engage the adjusting screw. 08/1% Mine is 1. Its purpose is to spray fuel into the air box to assist cold starting, the thermo-time switch regulating the amount of fuel injected. This pressure adjuster is used to exactly adjust fuel pressure in the fuel line to 29 +2 psi (meaning 29 to 31 psi or 2. These valves open and then drawn into the engine by the suction close the intake and exhaust tracts generated as the pistons descend. ELECTRONIC CONTROL UNIT & FREQUENCY VALVE The electronic control unit is designed to continually correct air/fuel mixture, based on signals from the oxygen sensor. ating conditions. To adjust the mixture, turn the Allen screw clockwise to make the mixture more rich. I For more than ten years, Porsche used the Bosch K-Jetronic Continuous Injection System (CIS) on all production 911s. April 17, 2017 My Haynes guide (for my '72 164E w/ D-jetronic) lists the proper procedure for the above and tells how to hot wire the pump (all you do is apply +12V to a wire and that runs the fuel pump with the engine off. Factory specification for base CO is a duty cycle of 54%-65% translated to a dwell reading of 49-59 degrees. However, youmaybe able to save a fuel distributor bycleaning the control circuit The ECM 101 may determine or adjust fuel injection timing based on ECM programming, inputs from engine or vehicle sensors 119 or 121, and so forth. Bosch K and KE fuel injection systems 4B•3 4B 1. They were about $100 USD. Not only will too rich a mixture waste fuel but too lean a mixture produces less power per engine cycle and ends up consuming more fuel per mile. . ) I figure others will have the same. 4 shows the fuel distributor, primary pressure regulator and air flow sensor from the Bosch K Jetronic system. (CIS-E) fuel injection, such as is used on the. With a dwell meter adjust the CO to 45 degrees. Adjusted the valves, fitted new plugs and engine oil-original oil stank when removed. Pressure regulator 6. plug is then replaced and no further mixture adjustment should be necessary. Fuel injection timing is typically measured in degrees relative to when the piston 107 is at a top dead center position in the cylinder 109. Warm up regulator. ating conditions. 4. K-lambda (as it's often referred to) has better emissions, in theory, than its basic predecessor. spec fuel injected Fiats On CIS-lambda, the frequency valve works in conjunction with the oxygen sensor and K-Jetronic control unit in an effort to produce K-Jetronic's ideal 14. S. Tweak the idle speed down if needed and adjust again until its happy. car models – starting with Bosch K-Jetronic, and after that – Bosch KE-Jetronic. Always make air fuel mixture screw adjustments with a warm engine and the engine running, so you can listen to how the adjustments affect the engine’s idle speed. My 1988 928s4 has a LH Jetronic system (the L stands for "Luftmengenmessung" in German, meaning "air flow management" and the H stands for "Hot Wire" referring the the Mass Air Flow Sensor that is used). 1 Bar) and keep it there, no matter how much fuel is consumed. This synthesis, comprising the mechanical basic functions coupled with electronic adap­ tation and opti mization functions, is the KE-Jetronic. If "S" and "R" are reversed the pump will suck unfiltered fuel and rust or other material can easily contaminate the injectors or even jam the close tolerance pump! D-Jetronic Fuel Injection for the Porsche 914 Page 1 of 10 K-Jetronic 1:9 K-Jetronic with Lambda control 1:9 KE-Jetronic 1:9 applications-identifying features 5:5 introduction 6:3 load-sensitive enrichment 7:11 mixture adjustments 7:10 mixture-control unit 5:3 mixture enrichment 7:11 troubleshooting and service 6:3 tuning for performance and economy 7:10 Control plunger and sensor plate 5:7 Control plunger Adjust the air/fuel mixture if it is more than 6mA off of the spec. I've made adjustments on my car (w/ a '78 CIS engine) using a 4-gas analyzer, and I think a good tuner should be able to make a good mixture adjustment without the CO tester that everyone thinks is so indispensible. This must be the method to set idle mixture if you dont have a CO meter. 0. There were three iterations of it in Audi’s Later KE Jetronic systems with electronic control also employ what is known as the EHA or Electro Hydraulic Actuator, which can adjust the lower chamber pressure as a means of fine tuning the fuel delivery rate to the injectors. As I own two KE Jetronic cars and one K Jetronic, It made sense to purchase some fuel pressure gauges. reason, the well-proven K-Jetronic was retained as the basic injection system but was uprated to a more intelligent and more efficient system by the addition of electronic circuitry. Use a long hex key, or the special mixture adjustment tool to turn the screw. 5 on idle,you may find Control pressure readings qualify the mixture adjustment that must be made through the cold start and warm-up process. Turning the screw in the opposite direction lowers the plunger and the mixture is leaned. Mixture formation 7 Gasoline-injection systems Overview 10 K-Jetronic System overview 13 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 K-Jetronic Since its introduction, the K-Jetronic gasoline-injection system has pro- Hi Again all, Finishing up on my fuel system tweaking, tomorrow I'm going to make final touches on the idle mixture adjustment. . Golf Mk1 > Volkswagen Workshop Manuals > Power unit > K-Jetronic/Ignition system > Mixture preparation system, mechanical injection > K-jetronic injection system > Checking/adjusting rest position and free travel of air glow meter plate (engine code: DX and KT 03. 93 Add to cart 0 437 502 K-Jet injector seals (8) $ 14. These fuel injection systems were considered to be really reliable and trustworthy. This is handy for various no-helper tasks, not just k-jet service. 08 which in turn might get me some better mpg,My car has the 2. K-Jetronic (CI5)Troubleshooting . Firstly, I need to clarify some points from last month’s feature. Seaion 54, K-Moronic) Chapter F Exhaust emission control system Chaptw G Fuel evaporative emission control system Chapter U Crankcase emission con! 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. The warm-up fuel mixture is dependant on having the correct fuel pressure at the correct engine temp. When three-way catalysis became necessary in order to meet NOx limits, a means of keeping the air/fuel mix closer to the ideal stoichiometric ratio (that is, 14. T701 acts as a current source through R705 and the 5 K adjustment potentiometer (IA). U Jean Thanks for the help! 1 can't get my car down to 580rpm but my reading is much higher than 0. Clockwise for richer and lower duty cycle, CCW for leaner. When this screw is turned to the right a richer mixture is produced, when turned to the left, a leaner mixture is pro­ duced. A To fuel injectors B To warm up regulator Mechanical Fuel Injection - Bosch K-Jetronic At the heart of the Bosch K-Jetronic system is the metering head, which consists of 2 main sections. For most of Impco's mixers, lean gas valves are available. The only thing we've been able to find is what I understand to be the mixture adjustment screw for when the engine is idling, and not an overall mixture adjustment. The lower section has a flap which measures the airflow. 1982 323i e21 series 1 with k - jetronic 10. The ECM 101 may adjust fuel injection timing. 0 K-Jetronic fuel injection system air intake components - 8v engine At the end of this fuel line is an adjustable pressure relief diaphragm and a damper (not on all cars). Thermo time switch Rich mixtures on this system(K Jetronic)give surging idles anyway,fix the idle CO 1st before worrying about the stalling,these engines are quite happy to run on about 1 to 1. Note that this process is the same for any type of engine with an air fuel mixture screw. 4. S. The EHA is a electro-magnetic valve that controls the amount of fuel flowing to the lower chamber. When installing the mixture control unit, tighten the fastening screws uniformly. Smart-Tune-X BMW K100 w- early K-Jetronic inj. Special tools used: 1) Remote switch to turn pumps on – home made from a salvaged fog lamp switch. Primav pressure 5,7 bar to 5,9 bar Improper fuel mixture is the easiest way to lose MPG. system (For details of the ignition system fitted to l989 rndl year turbcharged cars. Start jet 11. The lower connection hose is attached to the pipe that is connected to the K-Jetronic fuel distributor control input. The effect of adjusting the IA is to shift the entire SC curve on the voltage axis. Page 117 911 turbo Fuel system Test and adjustment specifications for K Jetronic 25 -16e Test and adjustment specifications for K Jetronic Printed in Germany -VII, 1989 Page 118 Fuel Mixture REMOVING INSTALLING TEMPERATURE CONTROL SWITCH Removing Disconnect electric wires, loosen hose clamps and unscrew the hexagon head bolt. As Mark so elegantly put it, trying to solve K-jet issues without a proper kit is like trying to find electrical faults without a multi-meter. 86 >) This is the Rob Lentini "Lean Drop" method of adjusting the mixture on two valve Kbikes. Mechanical fuel injection - Bosch K-Jetronic, Bosch K Jetronic Fig. The test gauges plug in to the fuel distributor in two places. 0 437 502 K-Jet injector seals (4) $ 7. If you didn’t, you should probably grab a back issue, as some of this may not make sense without reading the first part. Pressing on the idle mixture adjustment screw will move the airflow meter plate, and lean out the mixture briefly, causing the problem you describe: Just try to be as gentle as you can, and make a small adjustment each time. The ideal air-fuel ratio is 14. Fuel circuit The fuel supply system comprises the primary circuit, This adjustment does not provide additional fuel to the engine, only air. The adjustment may be a combination of one or more offsets. Remove one injector line from the top of the fuel distributor, and while looking into the injector port in the top of the fuel distributor turn the mixture adjustment screw clockwise until the port just starts to fill with fuel then turn the mixture screw 1/2 turn counter clockwise. Now, to ENRICH the fuel The one other part that can be important is the idle mixture adjustment screw. The mixture can be adjusted by turning a small hex screw that is located in-between the fuel distributor and the sensor plate. Auxiliary air device 10. It sends a series of pulses to a frequency valve. 4C•4 Fuel and exhaust systems - K-Jetronic fuel injection - 16 valve engines Mixture adjustment :In KE-Jetronic system adjustment, except of making the mixture depending on depending on operating conditions and cold starting are different from K-Jetronik system. Looks like someone at some point has already adjusted this as the blockout slug has already been removed and the 3mm allen nut is visible. Mercedes suggests that special tools are required to adjust the mixture on the Bosch KE3-Jetronic (CIS-E) fuel injection, such as is used on the 1988-91 560 series motors. Fuel filter is a very important element of the fuel distribution, because of the low tolerances of the various components in the system, a very high quality purification of the propellant is necessary in order to guarantee proper operation K-Jetronic-a. refer to Chapter B. Certain operating conditions make it necessary to correct the mixture accordingly. The K-Jetronic system was installed as Original Equipment in series production vehicles in the years 1973 through 1995. Turning the screw in a clockwise direction raises the plunger slightly to uncover a little more of the metering slots hence the mixture is richened. Turn it clockwise to richen up the mixture, or counterclockwise to lean it out. With the addition of an oxygen sensor (aka lambda probe) feedback system, K-Jetronic's air-fuel mixture can be more precisely controlled while the engine is running under various conditions (cold, warm, full-throttle). 4B•2 Fuel and exhaust systems - K-Jetronic fuel injection - 8 valve engines 1081 VW Golf & Jetta 1. The unit can be tested by measuring fuel pressure as the engine warms up. If no fuel is rising out of the injector line outlet ports, rotate the mixture screw, with a 3mm Allen key, clockwise until the fuel just starts rising. Power Fuel The mixture formation system The four-stroke engine employs flow- produces an air/fuel mixture (based on control valves to govern gas transfer gasoline or a gaseous fuel), which is (charge control). Fuel circuits Fuet pressures within the KE2-Jetronic fuel circuit are as follows. Would this be a rich mixture and can it cause a bore wash issue. Adjustment of the IA has no effect on mixture when the throttle is open. adjustment, as with the main regulator body, tap the post outwards from the inside, so that adjustment consists of tapping it inwards from outside later. I've not had the car long, I removed the engine and replaced the clutch and both crank sensors, I also reverted to a genuine air filter in place of the K&N that was fitted. Mercedes suggests that special tools are required to adjust the mixture on the Bosch KE3-Jetronic. The big problem I forsee is that during a throttle position change, it will take evacuation of a lot of the 14 litre plenum for the K jetronic Air mass metering disc to adjustment screw either raises or lowers the controi piston for a given engine idle speed position of the air flow sensor plate, thereby richening or weakening the idle mixture. Furthermore, how do you adjust K Jetronic fuel injection? Remove one injector line from the top of the fuel distributor, and while looking into the injector port in the top of the fuel distributor turn the mixture adjustment screw clockwise until the port just starts to fill with fuel then turn the mixture screw 1/2 turn counter clockwise. Mixture adjustments Using lambda sensor for mixture monitoring 1. Fuel tank 2. Throttle plate 7. CHECKING The single K jetronic air mass metering system and fuel distributor will be mounted upstream of the plenum. 28 diff which is the easiest on fuel The upper connection hose is attached to the fuel distributor pipe duct. When the fuel starts rising back the Allen key off, wipe the injector line outlet ports and watch to see that it has stopped flowing. Injector 8. Bosch K-Jetronic Fuel Injection System AKA Continuous Injection System Bosch had developed early fuel injection systems but they were mostly confined to luxury cars due to the costs of putting a computer in a car at the time, as a cheaper alternative they developed K-Jetronic to capitalize on stricter emission regulations in the 70s/80s. -Is it possible to upgrade the Lambda sensor to a heated style? -Why doesn't the Delorean have an auxilary-air device, or does it? -Would some one please explain what the frequency valve does in laymen's terms? -Are the Delorean fuel injectors "air-shrouded"? Idle mixture screw adjustment – optimize your Mustang’s carb May 27, 2020 April 23, 2020 by Frank In order to optimize the fuel/air mixture on your Mustang’s carburetor, you need to correctly adjust the idle mixture screws to make the mix leaner or richer. Part-Throttle Fuel Mixture. Fuel is pumped from the tank to a large control valve called a fuel distributor, which divides the single fuel supply line from the tank into smaller lines, one for each injector. A faulty regulator will disrupt the correct fuel mixture to the engine. Ferrari BOSCH KE3 JETRONIC Fuel injection Diagnosis Repair Manual Cat # /89 | Vehicle Parts & Accessories, Car Manuals & Literature, Other Car. This synthesis, comprising the mechanical basic functions coupled with electronic adap­ tation and opti mization functions, is the KE-Jetronic. Many thanks in advance . 6. This is the job of the warm-up regulator! Sounds like the reg. The idle mixture is adjusted with this screw. Figure 7. n Fuel lines are at high pressure (> 35psi), use BMW factory hose for replacement n Inspect lines regularly, fuel under pressure can cause LARGE fire. The CIS meters the amount of fuel provided to the cylinders as a function of the air drawn Where is the fuel and air mixture adjustment for a k-jetronic 911 sc 1979 3 litre unit and what tuning/improvement can I make to ensure optimum performance and reliability? Thank you, XXXXX XXXXX Harpenden Hertfordshire tel 07985 115716 email [email protected] 3 To adjust the switch, insert a 0. While you have the injectors out, you could run a fuel system pressure check as well. OK, hunting & stalling, that's mixture, adjusted using a long 3mm Allen key thru the hole in the airflow meter body. In the Golf GTI, air enters from below and travels upwards, rising the flap with increasing air flow. Since then, the K-Jetronic system has been only of A friend and I have done a lot of research to try to figure out how to adjust the mixture. Two points I would like to raise here - if the car has not been "tampered" with, these settings are probably still correct and should be left alone - if the car is not running right, look elsewhere for your problems first. Turn the mixture screw anti-clockwise a further 45 0. 6. The screw is indexed so that it should click when you rotate it. This should only be attempted AFTER the valves have been properly adjusted AND the throttle bodies have been properly adjusted: "Here's a manual method of setting L-Jetronic K bike fuel injection CO (carbon monoxide) mixture without the need for an exhuast gas analyzer: Thoroughly warm the engine. Bosch K is fitted to Escort RS1600is, XR3is, Sierra XR4is and 2. There is a little set screw in there that adjusts the height of the air flow sensor plate arm, changing the relative mixture via the frequency valve. It does this with the lambda ECU changing the amount of open and closed timing of the frequency valve. (More coming soon! – I need to make a test harness and a 16v car to test!) Adjusting the mixture. of fuel/air mixture during cold idling. fuel tuner overrides engine sensor signals being read by the PCM, resulting in an adjustment to the fuel map which causes the increase in engine performance as well as revamps pep and throttle response through the rotational speed range. Spec Alfa Romeo GTV6s, Milanos, and 1982-1989 Spiders, BMW E12 5 series and various 3 series cars, The Datsun 280Z and 280ZX, All U. The lambda ECU reads the O2 sensor to hold the AFR at 14. 29 Add to cart 0 437 502 K-Jet injector seals (6) $ 10. On my car idle air is adjusted on the throttle body. 4 shows the fuel distributor, primary pressure regulator and air flow sensor from the Bosch K Jetronic system. I am going to perform a fuel pressure test at the weekend. 1 Fuel Tank 2 Fuel Pump w/ Check Valve 3 Shortly after emissions regulations began to require engine management systems that adjust air/fuel mixtures in response to a feedback signal from the exhaust system’s oxygen sensor, the fuel injection system underwent a major evolution into the KE-Jet. This is a well-known design issue with 914's, "warm start over-enrichment" is what we'll call it. Mixture adjustment is via the 3 mm allen screw, turning the screw clockwise makes the mixture richer, remember lean "out". L-Jetronic System - Fuel Flow n Fuel is pumped up to fuel rail and excess returned to tank n Because so much fuel is circulated, filter is quite large. These Left is Lean, Right is Rich, so turn the hex key counterclockwise to lean the mixture out. The dedicated shade tree mechanic cando it, but needs to be well-informed first. Need help with setting the fuel mixture on the ke jetronic. Adjust fuel/air mixture. 4 Figure 6. The tools you'll need are pretty basic, but any attempts to make critical adjustments to KE without The main difference between the two types is that on the KE-Jetronic system all mixture corrections are controlled electronically by an electromagnetic pressure actuator incorporated in the fuel distributor. To correct the problem the fuel press will have to be readjusted. For early model cars using the K-jet (mechanical fuel injection) system, mixture adjustment is quite simple. 10 mm feeler blade between the throttle lever and stop (see illustration), then loosen the screws and move the switch towards the lever until the contacts are heard to click. 57 Add to cart 0 438 100 002 6cyl NON-Adjustable Cast Iron Fuel Distributor Repair Kit The final car to use K-Jetronic was the 1994 Porsche 911 Turbo 3. Whilst I've got it out of the car I thought I'd give you a quick look at a fuel distributor from a Bosch KE Jetronic or CIS injection system. But electronically controlled or not, fuel contamination is the number one prob lem-starter in any K-Jet/CIS system. The second video was on KE Jetronic EHA adjustment. 0 to 2. Nowadays such a system is called common rail. It also seems that the Bosch K Jetronic is very sensitive to vacuum leaks. The fuel distributor has been know to become gummed up, and the plunger can stick. This will reduce cold start pressure reduction, so if the engine is COLD, or ambient temperature is low, starting may be a problem. In the fuel-management system of the K-Jetronic (or carburettor system), the closed-loop control of the mixture takes place by means of an additional control unit and an electromechanical actuator (frequency valve). Tighten the screws on completion and remove the feeler blade. The start valvesystem consists of an electrical injector and a thermo-time switch. Improper fuel mixture is the easiest way to lose MPG. 7:1 air-fuel mixture ratio for maximum fuel economy and emissions control. K-Lambda and KE. Step 6 – Inspect the idle adjustment screws (K & L-jetronic) Early cars equipped with K-jetronic injection have an idle screw and fuel mixture adjustment screw for fine control unit which controls fuel mixture. Manual setting of mixture screw on K-jetronic system [200][1980] posted by someone claiming to be Jorn on Thu Sep 11 20:44 CST 2003 > V posted by famousdan on Mon Aug 1 09:27 CST 2011 > V reason, the well-proven K-Jetronic was retained as the basic injection system but was uprated to a more intelligent and more efficient system by the addition of electronic circuitry. It si pink in colour and has 5 terminals. The idle speed will usually come up slightly, and it will run smooth. The pressure actuator is directly controlled by a variable electric current delivered by the fuel-injection control module. which involves advanced Air Flow Meter instructions for adjustments for Max power and best emissions. The only practical way of changing the part-throttle fuel mixture is to change the profile of the gas valve. Try 1/4 turns at a time, and make note, as then you can always return to where you started if it runs worse. T his month I’m starting my multi-part Bosch K and KE Jetronic article. . H opefully you all read last month’s feature on Bosch K and KE and are ready for part 2. Provided that everything works fine, mixture adjustment requires just long 3 mm [IIRC] hexagon screwdriver or bit and multimeter with necessary stuff to measure differential pressure current. is out of adjustment. 5 K-Jetronic system main component The electric fuel pump delivers more fuel Electric fuel pump K-Jetronic than the maximum requirement of the 1 Suction side, 2 Pressure limiter, 3 Roller-cell engine so that compression in the fuel pump, 4 Motor armature, 5 Check valve, system can be maintained under all oper- 6 Pressure side. adjustment tool should not be a problem there, K-Jetronic have a allen key adjustment screw that hits onto the air flap sensor plate thingy ekkk i think its about 2. This little screw resides down a tube between the sensor plate and fuel distributor, and uses a long 3mm hex key to turn it. Because the air-cooled D-Jetronic depends on head temp for setting the warm-up mixture, you're likely to have a bit of bogging and low idle for the first 5 minutes, until head temperatures come up. The adjustrrient scmw is subsequently sealed and no further mixture adjustment should be necessary. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. The relationship between the air-flow sensor and the fuel distributor is set by means of the idle mixture adjusting screw. Another excellent source of general info on the Bosch Injection System from the early D-Jetronic (electronic) to K-Jetronic (mechanical - constant Injection) all the way to the later variations of the Motronic engine management with Lambda exhaust sensing to allow the system to function closed-loop, is the book: Bosch Fuel Injection & Engine This is adjusted by messing around in the little hole between the fuel distributor and the black rubber intake boot with the 3mm hex tool. The oxygen (lambda) sensor sends electrical signals to the control unit based on the oxygen content in the exhaust. Mixture adjustment Provided that everything works fine, mixture adjustment requires just long 3 mm [IIRC] hexagon screwdriver or bit and multimeter with necessary stuff to measure kf3 pressure current. Warm up engine, turn it off, connect multimeter, turn on ignition and verify that it is in correct polarity and shows between + 100 mA and + 120 mA, start the engine and let it idle. This actuator is adjustable, but this adjustment is usually not advisable without proper factory equipment. K-Jetronic: Troubleshooting Symptoms K-Jetronic is a mechanical system: the fuel is continuously metered in proportion to the quantity of air drawn in by the engine. Fuel pump 3. K and KE Jetronic fuel injection. This is done by the electro-hydraulic actuator. 5mm or 3mm across the flats, sorry its been awhile since ive looked in one or my tool box for that matter, but the trick is to get a long enough key that will stretch the length downwards so you can get the clearance to turn the But if something went wrong with the linkage between throttle and fuel pump, all mixture would be wrong. This is to be found under the dash on the drivers side, above the bonnet release handle along with a few other relays. The frequency valve is located in a fuel line that connects the upper and lower halves of Figure 15. 21 K-Jetronic system mixture adjustment screw location (arrowed) 22 Stabilise the exhaust gases (paragraph 18). NOTE: With CI fuel injection, the lower the duty cycle or dwell, the richer the idle fuel mixture. k jetronic fuel mixture adjustment