Thank you Pierre! You are an invaluable asset to the MB Community!

Been having trouble passing smog m104.980 . High HC, but not outrageous. Noticed at idle I can set my mix via lambda port and the mechanical side of the system dives rich when I raise rpm (duty cycle goes toward zero on lambda). I decided to finally check differential pressures and found 91 system and 82 Working for a diff of 9! Or .68 Bar. So I had to dial the EHA counter clockwise about half a turn and eventually got it dialed in 5-6 PSI difference. I rechecked lambda and set the tower screw for the system running at 50% . It's running much better now and I noticed its not going rich when I raise the RPM. Also if anyone finds you have zero psi differential but the idle seems to change when you open the valve, you have the hoses hooked up the wrong way and need to switch them. Took me a few minutes to notice what was going on. Initially opening the valve caused only a small change in idle. After EHA adjustment it really bogs it down when I crack the valve, like opening an EGR valve at idle.

Brilliant. You won't find a better explanation on the internet.

Pierre there is a point in the video where you say you are reading control pressure which is higher than the working pressure. 6.0 with valve shut, open the valve reading control pressure 6.3. This info is very valuable none the less.

One of my favorite videos, Pierre. First order of business on my 560.

Although 0.4 bar is spec, the factory set them a little on the lean side, and I have found that 0.45 bar will actually make the throttle response a little better and can help get rid of a slight stumble on acceleration. I have found this especially true on the M103 engines, but any KE engine can benefit from the 0.05 bar increase in differential pressure.

Haha I agree. Appreciate Pierre’s love and care for these Mercedes, but it would be impossible to explain something so important to Mercedes heads and make everyone cringe and round for the hills. The only reason people put up watching the murder is hoping to find out if the perp got away or not.😮 A little constructive criticism… Move the camera out… way out! Next do some show prep, organize your example pieces. The way he held everything, I have never seen anything like it. 😂 I thought for sure that Fuel pressure rig was going to tangle him up and us viewer would have to call 911 live to have someone race over to the shop and see if he’s still alive and still breathing. I image the paramedics would find him all tangled up under his desk with his glasses dangling off his right ear, but not yet fell the 6’ to the floor. Not even SNL could do a skit this good. My favorite part of the whole video was the way Pierre held the distributor and explains how and where to connect the BOA constrictor fuel pressure rig. Dude it was literally upside down, everyone at home had to get off our chairs and stand on our heads to even get if we were lucky a microsecond glimpse of this magical location. So in closing Pierre all the words above was done in love❤, you have taught all of us valuable information included myself over the years. You know it just hit me we all have heard the phrase “God works in mysterious ways” Right? Tomorrow I’m getting up and going to call my Dr and then I’m going to grab all my depression and other emotionally balancing drugs and flush them down the toilet. And every morning and night I will watch this video and enjoy the greatness of how within one short video my spirit has jump with joy. I literally feel so happy right now! I’m not sure if you changed my control or working blood pressure, by dude its .04 right now. If you were really smart, if every video could be laid out like this you would have a million followers. Where else could we learn critical Mercedes head scratching information and come out at the end and be so happy that you run to the garage and actually begin to like working on that old classic. Well done! Well done!

This was an absolute invaluable video, especially for anyone working on classic European vehicles. What is the kit that you used, our k-jet test kit doesn't have the silver fuel line adapter you've shown. Thanks.

Thank you so much, I will definitely be using this in my r129 500SL

Hi Pierre. So, the correct procedures are : 1. Getting the Working Pressure about 0.4 bar higher than the Control Pressure. 2. To test the Working Pressure is by closing the valve of the pressure test kit, run the engine and see the pressure reading on gauge. Vv for testing the Control Pressure. Please correct me if I'm wrong. Thanks!

You have obviously paid your dues. Excellent info.

many thanks for posting this- very useful for my W201 16v.

Thanks Pierre As always a very informative easy to understand video

Great video keep up the great work Pierre

FANTASTIC! I would also love to see this done on a running vehicle!

Great info as always. Thanks for sharing.

I don't have one but a super video. Thanks. Liked

2 thumbs down from Kent Bergsma and JG Francis 💩 Just kidding Pierre very helpful and we'll explained video. Thank you for unselfishly sharing your knowledge and taking time to make this. Much appreciated!

Thank you for your info and video. Very helpful.

Thanks bro , this fuel distributor have complicated system pressure

I hadn’t thought about doing this level of testing of my fuel injection, but after watching this video I kinda want to do it just because I’m curious and it sounds kinda fun. I don’t have a poor-running engine, but it is cranky on start. Unless I press the gas pedal ahead of start (cold or hot engine), I wind up most of the time doing a ~2-second crank before it turns over. Once in a blue moon it’ll start up almost instantly without any gas pedal pressure-so I don’t know what part(s) are guilty as charged for this problem.

Many thanks for this one Pierre.

HI this is great video.With all respect but can you clarifying if this test need to be done on engine runing or off using fuel pump bridge?Thank you.

This is very helpful! I will definitely measure my pressures using my newly bought fuel pressure meter (not with the valve unfortunatly) 1 question I have is: whats the role of the fuel pressure regulator in these pressures? What does it mean for the pressures in the system if that one is bad? What am I supposed to read as pressure coming from the lines from the regulator?

You're also invaluable to the old VW, Audi, and Porsche community with CIS fuel systems.

Great info Pierre. 👍

Thanks so much Pierre

Kindly do it on a running as it will be easy for some of us. 😉

thank You so much Pierre!

w124 230e 1991 102engine. Lower chamber pressure at 3.4bar. control pressure 7.4bar. Car runs , got it 2 weeks ago. What could cause such a low system pressure? Fuel pump works. Fuel Pressure Regulator replacement? Beautiful car, but someone screwed up the fuel system. Also seems like the EHA valve is on some sort of mechanical mode as it has no effect when unplugged. Any W124 forums you can point me to, would be much appreciated!

Hi Pierre. First of all thanks for the video and sharing your knowledge. My question is related to the EHA to be detached when you test pressures. Do you need you block those two conducts that are exposed when you detach the EHA to avoid any fuel going out thru them?

Hi it is a great video . My car is 3.0 MB 300e and I have 4.8-5.2 bar is that ok or should be 6-6.4 bar

Awesome Thank you

Would be very helpful if you could do it on an actual car while it is running. Thanks

Thankyou for all videos Pierre l have 1988 300 se can you to please the fuel pressures

you are the best, thank you, I have a problem with the waste of fuel, in addition, there is carbon on the spark plugs, and the burning is not good W126 M103, so what is the best solution for this problem, thank you very much, Sir

Hi great videos! Totally helpful. I have an issue with a Sl560 Ke jetronic. Fuel is not coming aout from feul distributor to the injections. Fuel pump run fuel si coming in to distributor but not aout to injections!!!

I have a 90 300E that isnt running right and this may be my problem. The car wont rev up off of idle. It just stalls or falls flat on its face. At one point the problem went away when i cracked loose a fuel line while it was idling. It ran fine for a week after until i changed the fuel filter. After that the problem returned and im at a loss as to why its acting this way. Any help is appreciated

Where do we fing this fuel line test hose with the couplers and shut off valve

Pierre, love all your videos. A question, when checking the fuel pressure as you describe, If the working & system pressures are the same and opening or closing the fuel gauge valve has no effect on the pressures and adjusting the EHA adjusting screw has no effect on either raising or lowering the pressure differential on the gauge, does this mean the EHA is bad?

you are the man! Please do the testing in a real car! ahaha. Thank you so much!

Thanks for the informative video, is it possible to replace a k-jetronic directly with the ke-jetronic fd system if your k-jet is faulty?

whats are the correct pressures for 89' ferrari testarossa??

Where can I get the gauges to test fuel pressure

Hell sir , its very informative about the K-jet fuel pressure i have w124 with M102 engine can you help me that what will be the working Pressure and control pressure . Thanks

This video was good 👍

Hey very good videos thank you so much I have a 1992 500 SL that I got fro a Frend it was parked up in 2015 and now I am trying to get it started it will not start I have change the fuel pumps fuel is coming up to the fuel distribution but it is not coming out can you please guide me as to what next should I do.

Where can I get a kit to check pressure

Hello thank you for the effort exerted how much is the ideal pressure ratio when it is alha when it works well

so where may I find such pressure gauge.?

Thank you Pierre for all the information I'm rescuing a 300E and been working for a while on this mb I have a question for the tachometer works after awhile been in motion anybody knows how to check it is it the speed sensor? Thx

Hi Pierre, Thank you for your helpful videos! I have just one question about using te valve in your set-up. With the valve closed, you are measuring the raw pressure directly from the fuel pump. After that, you open the valve and read the control pressure. Isn't the number that you reading then, an average of the fuel pump pressure and the control pressure? Because you will directly connect the top chamber of the fuel distributor with the raw pressure. Thanks in advance, Tom

Hi! Thanks for the video! I have a 260e m103 that starts perfectly fine but wouldn't rev more than 2.500-3000 rpm. I tried adjusting the EHA 1/4 turn but did nothing, then I thought that the adjusting scew felt very loose, so I checked online and apparently the "starting" position for the adjusting screw is about 6.6mm deep. Mine was waaay less so I adjusted it to approximately 6.6mm. I know I'm not supposed to adjust without a pressure gauge but I was desperate (went about 10turns in). The car now runs exactly the same as before the adjustment. Do I have a broken EHA? Couldn't find anyone in the area that would touch my car. They only work on modern cars. Any answer would be greatly appreciated . Thank you!

Hi Why there is a holes in it.k jectronic. I have the fuels coming from the holes. Can it be repaired by glue. Let me know. Thank you

I am getting 6.7 bar regardless of the position of the tester manual valve. Does that suggest that the EHA is bad?

Hello great video can anyone tell me what voltage is used to test this valve 12v 9v or 5v ? Thank you

did you know if the 0.4 bar is good for the testarossa ! and if i both it from ferrari dealing it should be already set ?

I've got an slk230 I've been working at diligently, I was researching 190evo 2 models and the m111 that I have. seeing what could be interchanged

hi, my EHA is leaking a little bit in between the 2 pins. I don't see leaks anywhere else. Is it bad? Should it be replaced?

Wow that was interesting!

Pierre, you don't actually say what the ideal pressures (control and working) are. Only that the difference is important. I understand why, but also what should the exact pressures be? At a minimum? I tested my M103, and it is showing about 40psi with little to no change when switching the valve from off to on. This is with new fuel pumps, filters, accumulator, literally everything at the rear is new.

Does the same apply in a no start scenario ?

What is the size of the O-rings behind the EHA? BTW, this is a great instructional video. Now I need to find a reasonably priced gauge/hose set.

Hej Pierre Kan man fixa sådana instrument skälv? Eller kan man köpa vi dig och vad är priset? MvhJonny

Also please explain the difference between this and useing a sun machine gas Annaliser befor the cat and Turning the set screw located on top

Can a k jet tonic fuel dist. For a v8 Mercedes fit on a v8 rolls royce silver spirit system

Pierre,.. Excellent video could you please clarify why you make the adjustments on thr EHA but leave it unplugged ? Also , could this be done with just bridging the fuel pump relay or must the car be running for the EHA to get voltage Many thanks . Pete

So I have watched your videos on the KE-Jetronic, and others, but no one seems to address the issue of having good fuel pressure to the distributor, but no fuel out of the injector lines--except for the cold start injector. Any suggestions as to what would cause this? Thanks

is the exact testing kit in this video for sale somewhere? thanks!

When you open the valve, on the middle of your hose. don't you transfer fuel from (high pressure) working pressure to the (low pressure side) controlled pressure ? if yes, do that flow cause wrong measurement ? don't you thing that two gauges better than this ? (no fuel transferring)

Super late to your channel! This is great stuff. Where do we get that kit?

Update on my Cla-250 sport 15” it now has 119,000 miles 0 problems I guess cause mine was made in Hungary

I am living in the Caribbean

Please, disregard my previous post you said unplugged and not detached. Sorry.

What if I have K Jet and no EHA?

Has anyone ever tried putting a benz fuel distributor on a Rolls Royce same cylinders and years k jet same type or aluminum or cast

Which ports do us K-Jetronic owners use for measureing fuel pressures please?

And subscribed

How could I find what part number cold start valve and ovp relay my 85 500sel needs? I wanna verify that before I tear into this.

Thanks for great videos. Where’s a good place to get a set of gages? My 84 M116 has rough idle when warmed up and also if parked for longer than half hour tends to act like is flooded when starting on warm days.

No Ferrari here! Have not accumulated enough gold nugget jewelry to merit getting one 😀

If my car won't stay running with the EHA unplugged and the gage is setup?

Please do it on a running car please

😍😍😍

I sold my 2.3-16 months ago, but I still watch that, as if to remind myself how big a pile of shit that needlessly complicated system is... Great video tho

You're a great orator. Do you read a lot or what?

Hi Pierre, I got a 1986 420SL, and would like to check the upper chamber and lower chamber fuel pressure of the fuel distributed. Can you provide me the figures? Do you have a contact email address? Sincerely. Paul from Hong Kong

No Ferrari for me! I don’t have tall enough stilettos to merit getting one!

Вставьте субтитры на русском пожалуйста.

Another extremely poorly explained video.

Ugh…. Do this ON THE CAR!!! you know what you’re talking about but you cannot make a video worth a darn