RacerJJ Posted September 20, 2007 Report Share Posted September 20, 2007 What exactly do they monitor? If I have a race only truck and never plan on smog tests, can I disable these and plug the holes or are the necessary for monitoring engine perfomance? Thanks... Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted September 20, 2007 Report Share Posted September 20, 2007 The first O2's are essential to engine performance. They monitor your STFT and LTFT's. This information dictates how much fuel to add or reduce. Quote Link to comment Share on other sites More sharing options...
RacerJJ Posted September 20, 2007 Author Report Share Posted September 20, 2007 The first O2's are essential to engine performance. They monitor your STFT and LTFT's. This information dictates how much fuel to add or reduce. So a wide band or an air/fuel ratio monitor has no business in those holes, correct? Quote Link to comment Share on other sites More sharing options...
chpspecial Posted September 20, 2007 Report Share Posted September 20, 2007 I'm pretty sure that if you set up your truck to run on open loop all the time, the front O2 sensors will not be used since there is no need for the PCM to make corrections using STFT or LTFT. I would only recomend this if you have a wideband O2 and have tuned your ve table. Quote Link to comment Share on other sites More sharing options...
misterp Posted September 20, 2007 Report Share Posted September 20, 2007 As I said in your other thread - the WB O2 sensor replaces the factory front O2 sensor. And yes you must keep the front O2 sensors for the PCM to fuel the engine correctly. It's the rears that are the converter/smog monitors... Mr. P. Quote Link to comment Share on other sites More sharing options...
RacerJJ Posted September 20, 2007 Author Report Share Posted September 20, 2007 As I said in your other thread - the WB O2 sensor replaces the factory front O2 sensor. And yes you must keep the front O2 sensors for the PCM to fuel the engine correctly. It's the rears that are the converter/smog monitors... Mr. P. Ok, thanks. So if I decide to get 2 WB's, they'll replace the fronts? My rears are unplugged and out of the car. Do think I should have bungs added into the pipes of my new exhaust if the WB replaces the fronts? Thanks... Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted September 20, 2007 Report Share Posted September 20, 2007 (edited) well since your not running a custom operating system keep the front o2 amd add a bung on the driver side pipe (#7 cylinder) for your new wide band sensor Edited September 20, 2007 by 12'SROCK (see edit history) Quote Link to comment Share on other sites More sharing options...
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