i bought my prelude and the air /fuel is almost off the gauge on lean at a ceady cruise is that bad i nkw hondas run lean but that seems too lean

 

is this a wideband gauge? what is the actual reading? if you are looking at a light show from autometer with a bar graph scrolling kinda deal then all that gauge does it tell you nothing but look cool so you can say you have an air/fuel gauge.

 

If you have a standard type O2 sensor, they are REALLY sensitive right at 14:1. Just a little either way will swing from a full rich reading to a full lean reading. Normally, if you are always reading lean, the ECU will start trimming more fuel in so that you tend to run just on the lean side of 14:1. Performance chips will often shoot for something closer to 12 or 13:1. Either way, the standard sensor is only good over a very narrow range.

If you have a wideband sensor, then all bets are off. Often, there is a programmable output signal that will simulate a standard sensor that connects back to the ECU. You would have to find the manufacturer manual for the box that you have and dig for some wires to see what is actually going on.