Desperately need some help interpreting these Diagbox/Lexia live data graphs...Help!

[Mervyn44]

Thanks guys...

Compressions tests come back fine. Can't find any evidence of air leaks either.

Being suspicious about the EGR throttle and copy readings in those graphs I decided to disconnect it as its right there on the air metering unit at the front of the engine... it put on the EML but had zero effect on running. Blanking the EGR sounds like a logical next step so I'll try that next.

When you look at those graphs I posted, you can see how the data relates to engine speed. Several things don't make sense to me...

1, turbo pressure etc seems to be responding but turbo position is stuck at 100% while turbo reference position (which I assume is what the ECU considers normal) hovers around 50%. If you watch the turbo wastegate valve while the engine is being revved, it hardly moves, if at all! - is this abnormal or is just because the car is in neutral and not under load? Although the car is extremely underpowered and just bogs down at low revs, it does take off like a rocket when you get above 2500rpm on the road.

2, Injector circuit on cylinder 2 stuck at +6 permanently. This could be an ECU or wiring fault although I was told by somebody elsewhere that they also had this problem (caused by an injector coding issue), apparently with no ill effects! I've also heard that the total for all cylinders when added up should be around zero, but mine is far higher than that (assuming the value on the graph is accurate) which would indicate significant over fuelling?

3, the main injection advance seems to abruptly plummet when the revs approach 3000rpm. I wonder if this is normal or might explain why the car suddenly regains power at around this point? Up until now I had assumed that this was just down to the turbo kicking in?

4, lastly... the camshaft/crankshaft sensor graph is just a flatline at zero. Is this just because it is always in correct alignment and therefore fine?