D-Jetronic Problem!!!!!

Hi Danny,

if you have correctly measured then your ECU has a fault. Trigger contacts come in but 2 of4 injector groups do not work.

Hi Danny,
I remember your ECU and MAP were tested in Hildesheim at Bosch factory about 10 months ago as being error-free.
I think your ECU has been infected by the Goldie-virus.
(Don't think about this, it's meant for Volker)
But I think - like Volker does - your ECU has a fault that comes and goes... yes, it's not the only ECU with this behavior.

Fatal situation.
I can't help you - don't have Mercedes-stuff in stock.

Regards
Norbert

Hi Danny,

if you were in Germany or EU I would offer to check your ECU. However I am careful with a remote diagnosis. If Bosch has verified your ECU I would not maintain that it is broken without having seen a swap with another ECU that does not show the fault.

Many thanks to Mr.Nordfisch and Dr.Djet Volker for your prompt replies and guidance.
Mr.Volker provides that the following 5 items may fault:
1) Trigger contact fault
2) Wiring harness TC to ECU fault
3) ECU fault
4) Wiring harness ECU to injectors fault
5) Grounding fault of injectors
I am sure that items 2, 4 and 5 are 100% ok
For item 1) “Trigger contact fault”, I did not have a professional equipment to check, so I could only replace 4 trigger contact cams as suggested by Mr. Volker. I used the "Norbert's special plug gauge" tool I purchased many years ago and followed its instructions to adjust the clearance 0.45mm to 0.50mm then use Noid light and multitester to check that all 4 triggers have open and close actions.
As for the item 3) "ECU fault", I don't have the knowledge or equipment to check whether it still has a fault. I can only send it to Bosch for check-up, but I was told twice by BOSCH that the ECU is not faulty, which makes me very confused.
The first time it was inspected by Bosch and sent back to me for installation, the co was only 0.02~0.08 and could not be adjusted to the correct 1.5~2.5
After the second inspection from Bosch, it was sent back to me and installed on the car. The co was adjustable to normal 1.5~2.5, but the car only ran for a few days before the above situation occurred:
IGN ON, There is Noid light signal in 4 and 8 cylinder injector wiring connector (Is this normal?)
CRANKING, Only 4, 8 and 7, 2 cylinder injector wiring connector have Noid light signals.
Apart from ECU failure, I can't think of any other fault that would have this behavior.
Fortunately, I found a brand new ECU in Hong Kong that had been stored for many years for me to test.
Besides Bosch, any other third party could check whether my ECU is faulty?
I hope experts here can provide suggestions, comments and help to me! Thanks again!

Best regards,
Danny

Hi Danny,

if you get access to another ECU, try that one first. Bosch should be able to test an ECU deeply. But you know in rare cases it is diffcult with errors that are only temporarily. I myself have such an ECU in my 450 SL. I have tried to verify and isolate that mistake but it does not do me the favor to show that fault long enough. Indeed it did not show it for weeks on my test bench. In the meantime I use another ECU from my stock.

Hi everyone! Latest update and close case:
I found another ECU from another car owner for testing purpose. Turns out my car performs all good in the past 7 days (drove~210 miles):
1) no injectors started when IGN ON
2) all 8 injectors are orderly started when cranking
3) performance are good when running

At this point, I am pretty sure BOSCH did not successfully repair my ECU TWICE, what an unpleasant experience given its reputation and expertise (let along the hard work we have put in the past year in vain).

If not even BOSCH can help repairing my ECU, is there any alternatives/ suggestions to me? (e.g., modify the fuel system, cuz I am desperate now)

Thanks everyone again for your help along the way!

Best regards,
Danny