GerritD

Hi,

since 4 months now, I am a happy 928S driver as car runs really nice. Warm Control Fuel pressure is always 3,4 Bar (49 PSi)
Mixture was properly set (CO = 1,7)

Today however there was something strange in the acceleration between idle and 2000rpm : engine stutters/hesitates...once 2000rpm is passed, acceleration is OK
When engine is warmed up and I wanted to start the car again, it was very difficult to start....only keeping the throttle pedal fully down could start the car...
So Idle seems OK but once I am pressing the throttle, it is missing power and engine sometimes is cut...as if I did not get sufficient fuel.

Could the WUR be the culprit ?
I already replace my WUR by a new one and this lasted about 3 months.(rootcause rust blocked the bimetal membrane) which had the same effects.
No power, spark plugs blackish and hard start

Remarks :
- when I start my engine when it is cold (I left the car untouch for 1 day), the acceleration problem does not occur the first 5 minutes
- when I start my engine when it is cold, the idle is fluctuation a bit the first minute

GerritD

todays update : car starts normally and drives great....no problem anymore what so ever....

So it must be something electrical....perhaps the ignition unit that provides signal to my distributor?

All fuel pressures are still in range.