Hi havin a problem with back firing, changed sparkplugs, stripped and cleaned gas unit, replaced little filter with magnet just after gas bottle, run diagnostic check but no mil light coming on. does not backfire all time sometimes once or twice a day. Engine runs smooth no missing. Engine is the g420 fe. Cleaned o2 sensors any ideas guys. Havent replaced the carb diaphragm but cleaned and looks ok.
doosan g30s-5 pro 5