[mwebb]

for the calculated load PID to be accurate
real time fuel trim MB 33 on VW Audi OR
STFT short term fuel trim OR fuel trim on the front 02 sensor on America or Asian

must be within +/- 5% from zero at WOT , wide open throttle and at idle and 2k rpm

MB 32 on VW Audi or
LTFT long term fuel trim (American / Asian) MUST also be +/- 5% from zero
================
intake vacuum
is
useless for this
- the car above has either Under reporting NEW MAF sensor OR restricted fuel delivery , based on Calculated Load at 80% at WOT with
real time fuel trim adding over 15% at WOT .

test
do
not guess - graph or log the data to play it back

do not attempt this with tinker toy scan tools - they can not do it.
OBD-2 Vehicle Explorer Scan Tool Browser this is the cheapest real scan tool
Escan is better AutoEnginuity is very much better. VCDS is outstanding for VW Audi and
has ISO 9141 2 , OBD2 generic for lesser cars

vacuum
is only a portion of the load calculation , Calculated Load or ENGINE LOAD
is the sum total of all the LOAD PIDS as processed by the ECM in real time .

fuel delivery is determined by
CALCULATED LOAD or ENGINE LOAD .... not intake vacuum