MAIN MENU, MONITOR, 4 CHANNEL
CHOOSE AIRFLOW, KNOCK, INJDUTY, RPM
PRESS NEXT
PRESS UP (so you can see max values for each)
PRESS RIGHT (resets high scores for each)
drive around and replicate the problem
note down the values for each and post them here
if knock is above 50 odd its knocking too much, take out some timing
if inj duty is getting near 98% its too high, get more fuel into the system or larger injectors
if airflow is hitting 5100mv get upgraded airflow meters
if none of those are hitting those high values then
MAIN MENU, ETC, SENSOR SW CHECK
drive around and replicate the problem
when you see the engine check light flashing look at this screen quickly and look for any sensor names that go highlighted in black, normally they back no background colour, but will if the sensor is failing or voltage is out of scale. do not confuse this with the black dots, these are relays that turn on and off.
if its not of the MONITOR 4 CHANNEL items hitting their high values and its nothing obvious in the SENSOR SW CHECK page then procced here for a well known R32 RB26 misfire bug
covered in the PFC FAQ here and R32 RB26 misfire discussion thread here
58) My Skyline R32 GTR has a wierd misfire problem, what's wrong?