Spent the last few hours on the Z with TubZ and the conzult. I have attached the results so was hoping if someone could answer a few questions?

 

The idle isn't stable, it goes up and down between about 700-800 constantly - is that a vacuum leak?

 

The left hand O2 sensor show as no reading on idle but blip the throttle quickly and it shows a reading then drops to nothing, if you increase the revs steadily it starts to read then drops to nothing? Any ideas?

 

The power balance test is different every time even when run straight after each other? Any ideas?

 

If any Conzult expert has any other comments based on the readings please let me know, btw the car is a standard JDM Auto TT with only an EGR bypass and needs a MOT so I can drive but want to make all is ok 1st.

Constant changes in revs could either be dirty throttle bodies or incorrect ignition timing. ALWAYS perform any adjustments at operating temperature!

 

Timing is bang on at 15 BTDC, could it be a vacuum leak?

 

You can however get similar results by removing the air feed to the valve and squirting plenty of carb cleaner in there...

 

Is this the 90° hose that is fed from the metal pipe/hose from the turbo to intercooler metal boost pipe?