I am guessing my injection pump is going bad. Based off the sound and also my timing is going from DEAD ON in VCDS to Advanced, back and forth depending on the day.
https://youtu.be/XYSRp2-vUn0
https://youtu.be/XYSRp2-vUn0
The timing does bounce around too.. so heres the behavior I have been noticing. Full disclosure this car is new to me and the timing belt service has been done..Always hard to tell over the interwebs, but yes that pump sounds worn aka "high internal clearances" to me... had one like it once.
The numbers will help tell the tale for sure... you say the IQ is bouncing around, how about the timing?