STC wrote:In Cylinder Running Compression waveforms with WPS, With VVT Paralysed and then connected, & actuated via bi directional scan tool.
Are these things you have? If so yes please, PM me if too big to share share or Dropbox them...
For the VVT, I have a dirty
trick, as most scan tools can EITHER actuate OR monitor, but not both, I tend to take a look at the operation, and once happy timing is safe to proceed (we've had a few that were close to not being, so I check each time! not done any harm ... yet), then monitor on the tool and actuate by hand, that way we have collaborating data from the car's point of view in terms of what the ECU is seeing ... notice the warnings, and risks ... no responsibility taken for anyone bending some valves, proceed with caution and if in any doubt ... DON'T
One rule I should heed more often myself
Of course if your scan tool can do both, let me know, ours can't, nor can Maserati, which is where we see loads of VVT issues, hence looking at this car, we do so many variators and timing issues.
No sure if we'll do the WPS stuff unless we see a problem, probably settle for spark and/or spark and/or injector
The only data I can find is for the 156 engine:
Intake: open 0/25 BTDC, close 55/30 ABDC, intake total angle: 235 degrees
Exhaust: open 50 BBDC, close 8 ATDC, exhaust duration: 238 degrees
Overlap: 8/33 degrees
But not sure if this is the same AR323.10 version/configuration! And really want some definitive data to compare/calculate against ... so yes any VM data great
OK, we do have bore/stroke, compression ratio and pressure, firing order, I think I saw somewhere early in the google that the variator is 25° operation but never saw a factory number, and sure I saw a different number somewhere else, so knowing what that should be would be good too.
Also noticed that using the "Edge counting" measurement system, when using the "missing teeth" position for the rulers, that "rising edge count" is 1 short, but that "falling edge count" is correct ... yes, I can see why logically that it is NOT a bug, but not sure if it's been made clear? Well I'm sure I'll forget soon enough, but thought I'd share my hand counting skills and lack of forethought, maybe save someone else the brief puzzlement it brought! It's all down to the rising of the first edge having started (no edge change to count for the first peak), so I hope this helps someone! Simple rule of thumb If using edge count for missing teeth located rulers, that Rise after the "gap" use FALLING EDGE COUNT to get you teeth correct
Saw your Q7 thing, and will take a look, so please let me know if you solve it in the meantime
I do stand by my first observation, you need to see the pressures at manual gauges for Hi/Lo to be sure it's not a blockage or other defect, which is rightly tripping the system off, by either excessive high pressure or indeed excessive low pressure. Best rule that out first, otherwise you are chasing your tail for a correctly working control system
Feel free to pop it over, it'll only take 5minutes, plus coffee time of course ... rusty nut scratching time extra!