280SE 3.5 Problem mit dem Injektorimpulsstrom

Merhaba Kutluhan Bey,

new yellow injectors are hard to find and I have recently seen strange copies with 0280150034 mark from China. Are you sure you got the right injectors from Bosch? A wrong impedance of an injector could create problems on cyl. 5 as well. Or you have accidentially swapped air temp sensor connector and cyl. 1 injector connector. I have seen that before as well.

Her sey iyi olacak . Bu hatayi buĺacagiz .

Merhaba Voker Bey)
Thank you very much for writting in Turkish and support. I keep following checking your site for a long time and you prepared perfect references about Djetronic and Kjetronic as well.

About yellow injectors I have 4 new Bosch 034, 8 pcs 022' 8 pcs 034. Totally 16 cleaned yellow old bosch which have been cleaned by bosch service but has a flow rate around 120cc in 30sec. At 2 bar. Where the flow rate of new ones are 132,5 cc in 30sec. So there is a 12,5cc difference each injector at full throttle. I considered this as a power loss and bought 4 new yellow bosch and repaced old ones with new. So 4 new 4 old. Than as yiu mentioned i found one nanufacturer in china manufactured 034 ordered additional 8 pcs from him. I did not know that there will beimpedance difference iabout 4 ohm. This problem emerged after installing this injectors. However construction and flow pattern of this injectors are really good not bad, unlike classic bosch there is no nozzle at tip just 4 micro holes). But undoubly Bosch is the best.

Yes injector 5 I did not check but sure if i plug on 1 and plug off 5 it will be same. May be I should check signal and current consumption by oscilloscope?

Yardiminiz icin cok tesekkur ederim.

Kutluhan

Hi Mr. Norbert,
Thank you very much for reply and cable color information. I checked it's correct. Brown is ground and green main line.

Best Regards,
Kutluhan

Hi Kutluhan,

when I saw the chinese fakes with the Bosch no printed on them these days I already knew that I would soon run into trouble with them. They look so much like original ones, share the same part no. and are dirt cheap. Vendor prouldy presents that they also have a needle and not 3 holes. It will be difficult to see the difference. Unfortunately you have now proven that they are not working.

All 8 injectors must have the same flow as original ones and they must deviate with less than 10% at idle and at high rpm. I have once done some of my injectors and brought them down to 3% deviation by cleaning.

I would appreciate detail photos of original versus fake injectors here that might let us learn how to see the difference.

Hi Volker,
Sure, I send you pictures of chinese injectors. I will also send you Bosch when turned back home.

About my old orginal bosch injector ones before cleaning

At idle speed,
first 4 group was 12cc where other were 4 were 11cc.
Moderate speed;
first group 105cc, other were 4 were 106cc.
Full throttle,
first group 120cc, other were 4 were 117cc.

After cleaning;flow test at 2 bar in 30sec
At idle: All 12cc
Moderate speed: All 107cc
Full throttle: all 120cc

So what are nominal values, if 265cc in 1 min at 2 bar full throttle, so, in 30sec, 132,5cc full throttle, but where the mine max 120cc.

I also have new bosch 4pcs that I did not have flow test. But weirdly other 7 injectors looks like working good. However, to understand I will remove injector 5 electric plug when 1 is connected I guess it will be same.

Best Regards,
Kutluhan

Günaydin Kutluhan,

resimler icin cok tesekkür ederim!

Did you get your old original injectors cleaned and tested at an ASNU service? Even that costs more than these China fakes. If you are in real need of new yellow injectors, I am able to help, But I only do in case of emergency. My stock is limited.