I have some performance issues with my 2001 2.5TDI Allroad - (massive engine shudder under heavy load / revs relieved by slipping clutch and 5 second idle) that has caused me to check the Diesel timing.
I'm using the TDI timing check build into Vagcom (my release 704) and monitoring group 4 basic settings as indicated for the AKE engine.
As soon as Vagcom fires up this setting the engine revs increase to about 825 RPM and there appears to be a diagnostic change in engine management in some sort of engine advance / retard loop. The engine seams harsh for a period advanced / early and then smooth retarded / late - I can't find documentation on this.
The TDI plot is shown below. My engine appears to be a bit retarded - timing is ment to be 2deg ATDC +/- 2 - mine is at about 4.6 deg ATDC
I have some questions
1. Why does Vagcom say "please wait until injection is fully retarded"? This doesn't seam to change
2. What are the symptoms of a 2.6v6TDI being a little retarded and out of spec - i.e. power - drivability mpg etc?
Thanks for any input