I'm noob when it comes the diesel engines... soooo, I'm looking at these numbers and have no idea whether they're wrong or not.
The car is a '06 159 2.4 Q-Tronic. DPF and EGR had been removed before I bought it, and the torque limiters are higher than stock, so I assume it was remapped as well.
I'm chasing a random shaky idle, occasional diesel smell and of course high(ish) fuel consumption.
I made some logs..
On idle cyl# 2 & 3 have negative correction numbers. No idea if it is good or not... I should check the injector coding?
Still on idle, fuel quantity. This seems odd to me. As you can see the desired fuel qty jumps around for no obvious reason (to me), the actual qty stays flat (as it seems logical to me)..... shoddy remap? Desired air qty is flat, you will see that on the next chart...
Again, car is idling. Desired air gty is nice and flat 229,5mg/i. However, the actual air qty is about 40% more. This is worrying to me. EGR is blanked and coded out.
I did a log for a long drive, actual air qty is 54% more than the desired in average. Max difference is ~130% more. It is normal cruising condition around 1300-1500 rpm and a steady 10% gas pedal position.
My conclusion is:
-Diesel smell is probably leaky swirl flaps, because I can only smell it in the cabin or in the engine bay.
-in normal cruising condition, it runs richer than the desired fuel qty, but I can't relate it to actual air qty. Sometimes the air is also more sometimes it is less ... confused....
I know there are some prettttty clever people on board, could You please help me understand what is happening?