Audi-AAN/ADU/ABY installs are usually quite easy and smooth nowadays. Rarely (these are almost always home-modified setups) there are some issues. This is one of those cases.
An significant modification in this case is the 7A flywheel.
There were many trigger errors originally.
They changed the 2 VR sensors and the engine runs much better now, but there are still a few trigger errors.
Scopeshot of crankhome-VR and HALL:
- The crankhome-VR is inside the HALL window.
- but margin is not as great as originally claimed
- is the HALL signal captured at the HALL sensor output ?
- Or after the AudiTrigger/CamHALLInverter ? (which is inside the box, so unlikely, but who knows...)
- the factory HALL signal is 5V most of the time (90+ % duty). See the image on InputTrigger/AudiTrigger with the German text.
- this HALL signal is mostly 0V. That means it would be more noise tolerant without the cam-HALL inverter (and 360 degrees offset in config, configured "without cam-HALL inverter" if it is now configured "with cam-HALL inverter"). It would have been great to see this scopeshot before sending out the new, motronic55 ECU to help investigation. Than we would have had set that up without the internal cam-HALL inverter HW !
But what kind of HALL sensor is that ?
- Factory or some aftermarket sensor ?
- Is the HALL sensor in the distributer or at the front of the head at the sprockets ?
- What is the exact engine code the HALL sensor and the 1 window wheel came off ?
- does the 1-window wheel have a small window, or a giant window (mostly empty, and metal for a few % only ?)
Even more interesting is the noise signal. The VR apparently has 4 evenly spaced noise. It looks like ignition (or perhaps, but much less likely injection) noise from a 4 cylinder. But this is a 5 cyl, right ?
What is the source of the noise ? Maybe WBO2 ?
- It would be interesting to see if the noise goes away if WBO2 and/or idle-air valve are disconnected
- the noise is very likely because of the notches of the 7A flywheel (to clear the tool). These would be filtered out completely if we'd seen earlier that this HALL is different from the usual, mostly 0V and hadn't applied the cam-HALL inverter.
Do we have a vemscfg actually used ?