A couple of questions about Group 023 readings...I just did a fuel filter change on a 2004 Jetta TDI Wagon (PD) and took before and after readings. The before graph is here:
and the after fuel filter change graph is here:
1) My LBL file says these 023 readings are injector timings in microseconds. Is that a misnomer for the PD engines?
2) My "before" idle numbers were -50, -60 in that area. My
after numbers are -20, -30 in that area. When you say "will show -50 and above will be filter gettiing plugged, a good filter will show -50 and below" by
above do you mean -60, -70, -80 etc. and correspondingly by
below do you mean -40, -30, -20, -10? (the negative signs could get things confused by above and below). If so my graphs would indeed show improved fuel flow. But if you meant above and below in math major terms, then my data seems to show the opposite effect!
3) Do the 4 cyclinder numbers show fuel flow to each cylinder individually?
(The graphs were taken with automatic in neutral just idling, with some higher RPM revving in the middle of the run.)