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well on a dyno they stick a wide band into your tailpipe and it reads the air fuel ratios. i think it has to go plugged in to your exhaust to be a wide band but dont quote me on that.. google works wonders man haha
yeah makes sense.. and well i'm at work, and i'm blocked from automotive, and smelt the fuel on the way in here, figured i'd hit up some people on here.
back then i was experiencing backfires at high throttle settings.. immediate sign that the fuel/air ratio is too lean.. had to check the plugs after that..