Quote:
Originally Posted by Mechcanico Lee
The fact that you say when you disconnected the air mass meters it ran well without any faulting says a lot .
When you dis connect an air mass other sensor will go off line also because they need the reference from the air mass .
Egrs will go offline and i would say swirl flaps will go off as well , you need to check that the swirls do there sweep , you have egr codes but sometimes egr low flow codes are caused by swirls not working .
If you get a situation where one egr or one swirl is working out of phase you will get a un balance between the banks .
I think the lamda code is a consequence of another fault ....its reporting a rich situation
Under data blocks check each air mass kg / h to see if they are balanced , thinking about it if one air mass is off this will affect egr and swirls on that bank
You could try putting blanking plates over the egrs to stop gas flow , you will get egrs low flow codes as a consequence but that's not a worry for the diagnostic principle .
It could be swirls or egrs sticking in the warm up phase and then when it gets fully up to temp it frees up again , under actuators do tests on swirls and egrs to see if the sweep is smooth and voltage range hits high and low desired readings
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hi Lee,
I did spend some time last night on it going through some of your feedback with a view to take this [practically] into perspective... I noticed during several tests under Engine and Engine II - Measuring blocks that duty cycle isn't aligned on three fields [don't know what that actually means and why did it display on 3 x blocks in VCDS but two of the values were in line while another had +/-5... somewhat off the other two].
to add... I also did quick readiness test under OBD -> MAF and those values were originally somewhat off while the car was cold. As the temperature was approaching nominal one those were slowly coming together and settled around 5.3 [something]. Again, i don't really know what that means and what's the underlying cause of those misaligned readings but it seems that something isn't quite right... and i did several output tests too on the Engine and Engine II which didn't help much with the judder i have.
any suggestions or other tests i could do? I'd be more than happy to provide you with logs if you could specify what needs to be captured [and How
]?
Many thanks.