To GTB or not to
AO Silver Member
Join Date: Nov 2007
You can't just "adjust" fuel quantity at idle.
You can adjust idle speed, injection timing, fuel pressure, but not fuel quantity.
Fuel quantity at idle is adjusted automatically by the ECU itself, so it can maintain set idle speed, depending on the engine drag/load.
Also white smoke at idle has nothing to do with too high or too low fuel quantity.
This is just a sign of either faulty engine timing, bad compression or worn injectors (bad fuel atomization).