YK86
05-12-2005, 04:45 PM
I installed an Autometer air/fuel gauge a few years ago on the 86 EXi and hooked it up to my extra O2 sensor I had plugging the extra O2 bung in the DC header. As expected, the reading on the gauge after warming up are normally stoich at idle, rich at full throttle, and lean when downshifting. Pretty much what I was expecting.
It's a useless gauge but it looks nice so I intalled an Autometer Cobalt A/F gauge the other day in the Mustang. I tapped the O2 sensor wire at the PCM. But unlike the Accord, my Mustang gets readings that bouce back and forth between rich and lean the whole time when cruising regardless of it being warm or not. It reads rich at WOT but that's the only time I get a steady reading. After looking around the Mustang boards, this is apparently normal unless I get a $300 wideband O2 sensor (definelty not worth it).
So....what is the reason the Accord gets readings that are related to the driving conditons so to speak while the Mustang just goes back and forth except at WOT? Is it because it's ODB2 and PCM/ECU controls things differently from OBD0?? Does tapping a wire that's connected to the PCM affect anything??
The reason I ask is because if I can get simular steady readings (like the Accord) by getting an extra bung welded into my H pipe, and hooking up an 1 wire O2 sensor from an Accord, I might go for it since it's not that expensive. But if it's going to do the same thing bouncing back and forth regardless because it's the nature of OBD2 cars, then it's just a waste of money.
I find the boucing back and forth kind of annoying now LOL. I just hoped there was a way to get it to read like the Accord.
It's a useless gauge but it looks nice so I intalled an Autometer Cobalt A/F gauge the other day in the Mustang. I tapped the O2 sensor wire at the PCM. But unlike the Accord, my Mustang gets readings that bouce back and forth between rich and lean the whole time when cruising regardless of it being warm or not. It reads rich at WOT but that's the only time I get a steady reading. After looking around the Mustang boards, this is apparently normal unless I get a $300 wideband O2 sensor (definelty not worth it).
So....what is the reason the Accord gets readings that are related to the driving conditons so to speak while the Mustang just goes back and forth except at WOT? Is it because it's ODB2 and PCM/ECU controls things differently from OBD0?? Does tapping a wire that's connected to the PCM affect anything??
The reason I ask is because if I can get simular steady readings (like the Accord) by getting an extra bung welded into my H pipe, and hooking up an 1 wire O2 sensor from an Accord, I might go for it since it's not that expensive. But if it's going to do the same thing bouncing back and forth regardless because it's the nature of OBD2 cars, then it's just a waste of money.
I find the boucing back and forth kind of annoying now LOL. I just hoped there was a way to get it to read like the Accord.