Chasing a bit of a rough idle. New plugs ngk, swapped coils for another oem set no change. Car has 36k on it original owner. 2014 Si
No codes, checked compression and leak down no issues.
Tried switching maps from a previous tune on the car no change and went to a stock reflash same thing.
Digging through the service manual. Watching map voltage at idle the range is .8- 1.2 volts. If a fluctuation of .04 volts is noticed it mentions valve adjustment.
Wondering does the map voltage at idle usually hold steady at .86v for example,or is a slight voltage increase of .02 ok?
Im currently Seeing .084v-0.86v fluctuating back and forth on my graph after 2 cooling fan cycles all acc off. The Service manuals (good graph example) shows a slight variation then stabilizes at a set voltage.