What is the

The "blue wire" modification involves taking the blue wire from the AFC - normally unused on DSM installations - and connecting it to the oxygen sensor. The blue wire is a sensor check connector from the AFC that allows it to display the oxygen sensor reading. Kind of a free A/F gauge. The AFC does not change anything based on this "blue wire" input, it can only display it.

While quite popular initially, evidence is growing that the AFC accessory sensor inputs are not suitable for this kind of connection. Many people have reported that connecting the blue wire to the oxygen sensor artificially lowers the oxygen sensor signal by a significant amount. This is entirely possible since the AFC sensor inputs might not have been designed to be connected to low-power sensors such as the DSM oxygen sensor.

Still, it is a popular modification for those who want an unobtrusive way of keeping an eye on the oxygen sensor without actually using it as a serious tuning tool. Many DSMers scorn the idea of tuning by O2 reading in any case, as it is most likely the least accurate - though most certainly the least expensive - method available.

AFC owners should check out the Super-AFC-DSM mailing list on Yahoo! Groups. You need a Yahoo! ID since membership is now restricted. To join, click here.

The Last Word: This mod is cute, but useless. Use for entertainment value only.