Hi!

I'm running a Seat Leon 1.8T, AUQ engine. Stock internals and original chip.
There's a strange stumbling problem with the car right after starting, or when loaded directly after  a successfull cold start.
All this happens only below ~5deg C.

I've checked vacuum lines, fuel delivery, temp and MAF sensors and still couldn't trace the cause.

I've prepared a log with ME7Logger (thanks to Setzi!) and apparently when the problem occurs the ECU simply doesn't supply enough fuel.
It's over my head why.

Any ideas welcome!

Thanks for your answer.
Unfortunately the lambda control is not active yet when this problem occurs.  When it comes up the engine is running fine already. At that point it is between +-5%.  The LTFT values have been cleared before making this log.

The injectors are stock, as the whole engine is, the only alteration here is deleted SAI system -but not disabled in the chip yet.

Also worth to mention that the car has an LPG system but this problem only occurs when its running on regular gasoline after start.

CWKONABG should probably be used to code out the SAI system. Killing diagnosis != coding it out.

Maybe SAI was not functioning prior to being removed, so functionally wasn't there even before being removed.