Bmw 3.0Si D-Jet Bj 1974 - fine tunning

And after a test drive... Another fine tunning issue appears...

When releasing the throtle suddenly, the engine almost stalls (sometimes it stalls) and then makes a "saw" accelaration to 1200rpm and stabilizes again on 900rpm.
On the carburetted models of this Car, a throtle damper exists to prevent this.
And on the d-jet??

Thanks once again!

My car has a 'dash-pot', too.
But it's an Opel...

Regards
Norbert

Yes Norbert, Thanks for showing the manual! Perfect.

Volker, Thanks a lot.

The part numbers are those ones for european cars. Correct.
But I have ECU with red dot and another with grey dot.
And the only good MAP is the blue dot one.

Calibration markings as far as I could find

Good morning,

Afraid of the new behavior on a cold start, I tested it today at 7 AM. Temp 10 degrees.

Turned key and fuel pump on for 1-2s as usually.
Ignition for about 5s and it started (cold start injector not working?) at about 1000rpm (instead of 1500rpm as before).
Don't consider it a bad cold start but, a little bit more revs would be perfect. Maybe 1100rpm.
What do you think?

Good morning Antonio,

well correct revoltuons on cold start depend on auxiliary air slide valve (aka air regulatr). It has an expansion element that measures soolant temperature and thus opens an air bypass a bit more or less. Increase from 900 to 1100 sounds reasonable to me, as long as your engine runs round.

Regarding colour markings: Those were known on Volkswagen and Mercedes-Benz via stickers. I remeber having seen that BMW had slight changes on their ECUs and MAP sensor over the years, but that is normally readable from the year of make (like 231: meaning 72, November). But those changes were very small and there is no rule in Bosch workshop manual that you can only combine these ECUs with specific MAP sensors. Such rules exist in other cars where you have ECUs with 2 or more different Bosch numbers and then they must be combined with MAP sensors of specific numbers as well. Is there anything official about these colour markings? Never seen them on BMW so far (or maybe I just do not remember).

Bosch workshop manual has no restrictions on combining ECUs and MAP sensors of various years of make. So they would have freely exchanged them. And they also only show one BMW part no. Did they have several or also just one? If you wannt to be on safe side, take ECU and MAP sensor with a late (75) year of make. So FD must start with a 5.