i got 21 and 31 before, nothing major, but it seems your running lean, 21 is something with engune coolant temp, but i ignored it, although i think my thermostat is getting worn. if your car is running good from what you see or hear, or no loss of power then hey just keep chuggin along
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90 lx coupe: Mac cold air fenderwell, accel supercoil,advncd ignition,3-core radiatr, FMS alum D/S, Black magic fan, 3.27grs, 3chbr flows.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607
next mods: subframes, mac h-pipe