High CO on idle - MB 280SL 1976, M110 D-jetronic

Hi Stephan,
you wrote before you changed all the injectors.
What colour do they have? Injectors from 350/450 won't fit.

And nowadays injectors of chinese production are sold that wear a Bosch parts-number and look very similar to the original ones but have another spray nozzle and another behavior at idle and partial load.

Testing the trigger points by turning the engine by hand could suggest correct function because there isn't any flutter that could occur in a slightly worn distributor and heavy worn injection points.
Pull the unit out and measure the distance between the opposite rubber blocks. If you measure more than about 23,7 mm the unit is very heavy worn - a new unit has 23,0 mm.

Regards
Norbert

Hi Norbert,
Thanks again for your fast response!
New injectors are green, with right part number 280150035, but as you state likely Chinese products. However the old ones were original Bosch, green same part number and I had exactly same issue with them.

I had the trigger points out to clean and repair the connectors. I did not measure between the nocks and will do that as next step. If they are heavily worn, how do you repair/replace them?
I’ll keep you posted on progress, will not have a chance to tinker with the engine rest of this week.
Best regards
/Stephan

Hello Stephan,
I would never install the Chinese injectors in my car. All tests show that they are very reliable - they reliably show large deviations from one another.
ASNU companies report significant problems at changing pulse lengths.
I haven't tried it myself, but the other design seemed suspicious to me from the start.
Nobody here in the forum has reported using the injectors without any problems.
Original NOS ones cost around €150 if you buy them cheaply today.
But what speaks against having the originals professionally cleaned?
If problems arise, you can always replace individual nozzles.
We can help with procurement here.

I told you before there is a tool you can measure and readjust the trigger points with: jetronic.org/en/forum/jetronic/2301-high...tronic?start=0#21739 ... and you answered you would contact me...

Regards
Norbert