D-jet guys, never before encountered problem Options

[TheCabinetmaker]

Just reinstalled my new engine before musr12. Its a 2056 with Raby 9550 cam and djet. I reinstalled the original FI system complete. Components were bench tested before being reinstalled. Car runs beyond my expections.

Heres the only problem I have really have. Upon cold start (not cold-cold start) it idles very low and rough. A few minutes of throttle held to about 1400 rpms, and the aar kicks in and everything is normal from there. Or, if I start it and pull it out of the garage to the drive, everything is normal. Aar is working properly. Head temp sensor is the correct one and ohms are within specs both hot and cold. Ts-1 also shows 310 ohms at 60 degrees. Cold start valve is not hooked up. I have considered a leaky injector, but is seems that would cause problems only when there is adquate fuel pressure, not after setting all night. Ambient temp seems to make no difference.

Opinions please.

[r_towle]

most likely too rich at idle.
Turn down the knob on the ECU.

I am curious how your trained bosch mechanic adjusted the MPS for the new displacement....
Dyno tuned or did he put in an O2 sensor to get it set properly while driving?
It cant be done without a load.

Not trying to be sarcastic, but just turning the screw till it runs right is not how that part needs to be tuned and modified.

I would suggest a simple test would be to put an O2 sensor up the tailpipe and see what the mixture is when the problem is occuring...that will lead you to the proper place to fix it.


Rich