Bosch K Jetronic Fuel Distributor - Quick Look
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- čas přidán 22. 08. 2024
- 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. Popular with Porsche, Mercedes and VW/Audi in the 80s and early 90s before EFi became more ubiquitous.
This setup is out of my 1994 Audi 80 2.3e that has the NG engine.
Here's a link to the Mercedes Source video about cleaning CIS/KJet injectors:
• Back Flow Cleaning Bos...
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Just as an aside if a K-Jetronic car seems to be suffering from fuel starvation be aware that at least in some of these there's tiny fuel filter on the main inlet. If this gets blocked then you're going no where fast. I was told by a Audi dealer in the UK that it was meant to be removed at the first service after delivery e.g. 1000 miles but they never are.. Mine lasted until 135000 miles until nearly coming to a halt on the UK M6. This particular car was a 2004 Audi Coupe 5E and after establishing it was a fuel issue it was pretty soon obvious as soon as I began to disassemble the system. I can't remember if I actually removed it just pushed the innards out with a screwdriver but problem solved and it ran for another 100000 miles before getting rear-ended and written off.
I'm so glad that electronic fuel injection superseded this system. It's far simpler and straightforward to deal with
I'm glad you got a good understanding of the system...now we have a clue as well. :)
Not something you see everyday so I though I'd share. Thanks Wyatt
based comment
My 1978 5-cyl Audi 100 5E has sat for 26 years. I believe everything has to be taken apart and inspected. Even if the fuel quality in 1995 was better than now 😃
Great video! I just recently got myself a Volvo 240 Turbo with K-jetronic fuel injection. I think it's a really interestning fuel injection system, even though there are many parts that can break down.
I’ve got the non turbo
2.3 H cam 242GT version
Other than turbo issues what problems have you come across?
Not many people know this but the CIS system is the most profitable thing Bosch ever developed.
What about diesel injection systems. Especially the common rail systems.
Very helpful 👍👍👍
Nice little overview, Thank you, good job.
:) Hello. Seee. A fuel distributor. Glad theiy are popular with Porsche ;)) Leeking hose or not it looks super clean as it is! Cheers, Simone
K-Jet for life!
Buena explicación quisiéramos saber la instalación y desmontaje de los inyectores
hydraulic hose works well for high pressure systems take the the ends and they can make them up for you
That's a good option. This hose and these clamps work well for me. Cheers
@@Badgertronix blame HubNut Giggles
Great vídeo , i Think i may found why i have a high idle.
Great. Glad I could help
Hubnut is now NZ. Maybe he might come and visit you.
Hi, i am interested on the ford rs turbo one, they have an extra pressure valve and a 3 wire black, plug. Can I use normal k tronic one non turbo on a turbo set up?
hi mate its a simple thing really compared to todays cars
Thanks mate. It's a reliable system if well maintained.
My system pressure is good but when I turn the valve on it drops for a second then climbs right to system pressure cold with electric connector to warm up regulator un plugged tks for any help . I think I will have to repair war but want to be sure
Thanks for the informative video, is it possible to replace a k-jetronic directly with the ke-jetronic fd system if you k-jet is faulty?
my Audi b3 coupe broke down today new fuel pump and filter fitted but still broke down revs cut to idle !! as if fuel pump not working but it is !!
Awesome video. From what i know it uses fuel pump pressure to inject fuel right? I wonder how much it can distribute with oem and aftermarket pump. Keep it up.
Great video. Got mk2 jetta cli 16 valve kjetronic myself.
My car didnt want to idle.
However if i manualy work the sensor plate and override start relay the injectors spray.
I check for fire and firing order. All good. Fuel supply at the onjectors all good. No fuel coming from injector lines.
When does fuel come from injector lines if all are good on the system?
My Volvo 740 1987 with K-jetronic didn't start. This will help me to find out the reason ...
CZcams is full of K-Jetronic videos.
How do you adjust the height of the plate? I took away the plate but could not figure it out (KE-Jetronic Audi 100 2.0 E 1990)
My car doesn’t want to start when warm unless the CTS is unplugged. Audi Coupe 2.0 ACE engine 16v. Any thoughts? Have changed fuel accumulator, injectors and plugs
what are the signs that the fuel distributor needs a rebuild? i have a w201 and I don't want to mess with it if I can help it :)
Hard starting, poor running, poor fuel economy. Lots, but you get the same issues caused by lots of other things too 🤷♂️
Do you know anything about the Volvo k-jet set up..? It's mechanical fuel injection but located under the intake manifold. It's an 82 Volvo 242 2.1 with a cold start issue 🤷
50 bucks each ? that's pretty cool tho a manual mass air flow I don't think I 've seen one before. well not out like that one.
Most fuel injected cars in the 70's and 80's had this system. At least the European brands.
Cheers. Out of interest have you ever played with the Lucas mk 2 fuel injection system?
Can't say I have. Lucas anything doesn't exactly inspire confidence
High fuel consumption was problematic
Great video especially on the hoses. What makes the vacuum to lift the metering plate? Is it the compression stroke by way off the crank?
thanks. Airflow lifts the plate, it's behind the air filter
Love your video, very helpful, but can you comment on a 1976 911 with such system, is the a car worth considering ? Thanks
Eugh, I do NOT miss seeing those. Not one bit! Nope nope nope~
If you do rebuild your distributor, keep watch for the...compensation port? Forget what it's actually called, but there's a tiny, easy-to-miss pinhole in the diaphragm that lines up with pinholes in each half of the distributor. As I recall (at least with the six-banger), the diaphragm will seem to fit right side up or upside down, except that pinhole is offset... It also loves to get clogged, and hates to get cleaned! Be cautious if you're using shellac or some other adhesive on the diaphragm, as it will find that pinhole and plug it right up.
Wish I hadn't sold off that Crate'O'Parts(tm) when I moved from California! I had over a hundred Jetronic injectors I'd acquired from junkyards and ebay for $3-$5 each, all back-flushed and ready to go!
I'm rather partial to them but then I've only had to look after ones I've maintained myself and not neglected customer ones.
I'll have a go at rebuilding one as soon as I have a spare one. I'd rather not brick my daily!
What I'd do for a stack of kjet injectors!
Where did you get those braided distributor hoses? The ones on my e21 leak fuel and the parts are no longer available. Currently stuck with no viable solution :(
They're the original ones. You can get a hydraulic hose shop to make you new ones
Is there a tool to put them back in
Or u just gotta push really hard?
👍👍 scary! 😬😊
Only when it breaks 😳
Thanks You guive me a good clue. I bought a Audi 80 and have the same system, I have a hight idle and even temperature reaise, the idle is ate 2000Rpm, any clue or tips?. Many thanks for the vídeo.
Almost certainly a vacuum leak somewhere. Enjoy, they're great cars 😊
Has anyone ever tried say putting a benz fuel distributor same year and cylinders on a rolls royce?
Are you sure you weren't a euro tech in a former life? =)
I know an awful lot about very little. Sadly that does not make me a top tech like you 😎
If all injectors are firing at the same time isnt that uneconomical? What about bore wear from the fuel washing the bores continously?
They are not really firing, they are flowing constantly (Constant Injection System). Flow is regulated by the fuel distributor control plunger. Ofcourse electronic injection or direct injection is better for economy, but fuel wasn't so expensive 30-50 years ago 😃 All they wanted was more power than the carbureted version. There is really no bore wear, the Audi engines are really long lasting. There isn't enough fuel to wash the bore, if everything is working OK.
@@mcplutt "All they wanted was more power than the carbureted version."
Then they should have switched to a multi carb set up. The airflow sensor plate caused a massive restriction in the inlet tract and the fact that it was continuous meant it provided no advantage over carbs in terms of allowing large valve overlaps.
Where canI got the kit?
Hi Badger. I have a Volvo 740 K jet. Fuel only coming from 1 & 2 injector. 3 & 4 injectors are not blocked. Car was stood for 5 years. I assume if the diaphragm was knackered, it would affect all 4 injectors? I have had it running but the wiring for the fuel pump had been bodged and was only getting 9.6v with in tank pump not working at all. New tank pump and fixed wiring to main pump and I'm thinking I've pushed some muck into the fuel distributor. Any suggestions? I'd rather not crack open the distributor if there's a way of cleaning without. Sorry this is so long.
If the fuel pump isn't putting out enough pressure, could it have this affect?
I'd check your fuel pressure and inject spray patterns
@@Badgertronix Thanks Badger. I've done some research on CIS. I pulled the unit out and gave it a good external clean as the plunger operated by the air metering unit was a bit gummy. My working theory is that the control pressure has been adjusted to compensate for low fuel delivery from under powered pump. Now pump is getting full voltage, pressure is too high to allow metering plate to be lifted by vacuum. Just a working theory. Need to get the special bits of kit to test pressures and finding out what they're supposed to be would be an advantage as well. Injectors sing and spray well and equally when plate manually raised.
What controls the fuel distribution? Just the air flow meter? Can it run independently without the ecu?
@Kp Raz; The K-Jetronic is a driveless mechanical injection system which needs no intervention of Electronic Control Unit function. The air-flow sensor and the fuel distributor are assemblies which form part of the mixture control unit. The amount of air sucked in by the engine is controlled by a throttle valve and measured by an air-flow sensor. An electrically driven fuel pump delivers the fuel to the fuel distributor via a fuel accumulator and a fuel filter. The fuel distributor allocates this fuel to the injection valves and the injection of fuel takes place continuously. That's where the "K" comes from, which stands for the German word CONTINUOUSLY. I hope this help you with your questions. All the best, cheers!!!
KE Jetronic has electronic control of fuel and ignition. Electronically controlled mechanical fuel injection 👍
The well proven K-Jetronic fuel system was now uprated to a more intelligent and more efficient system by the addition of electronic circuitry. The K-Jetronic mechanical basic functions coupled with electronic adaptation and optimization functions is now called KE-JETRONIC -management of combined mechanical and electronic fuel-injection system ONLY. "Motronic" does the management of Combined ignition system and fuel-injection system.
@@tonyreyes9969 Kontinuierlicher einspritzung 😃
Does it need to be timed to the engine firing order?
no, all fire at the same time
Is it possible to adjust the amount of fuel per cylinder?
No, is not possible.
I've seen the K Jetronic on Volvo 760 GLE's with the PRV V6 engine.It looks complicated.
It's generally pretty reliable as long as it gets looked after
@@Badgertronix It's mechanical fuel injection isn't it?
@@jaggass yes although this version has electronic ignition
On fist gear while accelerating u can feel a slight pause and go pause and go not to noticeable but I can feel it not picking direct speed what could it be??????
Hard to know from that description
Can you please be more specific? What type or model of car are you referring to? Is your car equipped with a K-Jetronic fuel injection system like the main topic on this video?
@@tonyreyes9969 k jet on 92 190e when its cold fist start it feels like it loses gas then gets gas then loses gas slowly pocking up speed
Clear as mud mate. Now, could you repeat all that in English please !!
If it was in plain English they couldn't charge through the nose to fix it 🤣
Its all Japanese to me or German 😂😂
A nods as good as a wink to a blind horse 🐴🤣
Dont ask me XD
КЕ !