Mark

I don't know Alan personally, but I think that you have made a bad call here.

I suspect that his post was written, without consideration of what you had written, maybe that was because the two posts overlapped or maybe he just hadn't read yours. I often post something, only to look back & see that my advise was a duplicate of someone else's further back in the thread. I certainly wouldn't be happy at being chastised for it.

Alan has never really stood out to me as having an ego that needs a massage.

Pete

I can't believe that you haven't asked for a fully detailed gas printout, this would be a deffo good case for one.

Keith

I would be looking at challenging all entry points to the intake fanimould, i.e. the servo & EVAP connections & confirming that you have no leakage.

Its a bugger when you can't test fuel pressure & flow easily, but it is worth pursuing that line, if more obvious tests don't reveal the answer.

I am sure that if you had gotten hold of this earlier on, then it wouldn't have had an oxygen sensor wasted on it. Most O2 sensor (Zirconia or Titania) can be prompted to switch, with a few vigorous pumps of the accelerator. The response observed will help you decide if they are fubar or not.

I haven't seen one of these motors yet, but autodata suggests that is uses a MAF sensor input for one of the primary fuel metering calculations. Can you confirm that it has a Mass Airflow Meter & maybe gain some tests data from it?

The trouble with rarely seem vehicles like this, is that useful "good data" can be hard to get hold of. It was a Vectra, then you would be quids in!