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XfireZ51 · 10-17-2014

Marc,

You may recall I was chasing an issue w my O2 sensors earlier this year. Particularly the pass. side. On a scan, I would see a string of 0's for the voltage, which thee ECM would interpret as running lean. If that condition remained long enough, it would throw the LEARN function OFF and default back into Open Loop.
W a bit of accelerator, things would come back. You wouldn't feel any difference as it did that, but for purposes of tuning it would throw things off.
Some other tuners I communicated with suggested that AC O2 sensors were more consistent than the Bosch so I got two of them off Amazon. Voila!
No zeros, no open/closed loop flipping, no going into and out of learn.
However, I can't say that I experienced the bog others are sensing. I do see that on closed throttle decel, my WB will sometimes spike to 17 or 18:1 AFR.
I wonder if that's not the injector shutting down due to a too small pulse width being commanded, which brings up the issue of the injector offset. Another tuner using the ACCELs in a different motor saw the same thing happening

10-17-2014	#20
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Bogs for a second and then takes off Marc, You may recall I was chasing an issue w my O2 sensors earlier this year. Particularly the pass. side. On a scan, I would see a string of 0's for the voltage, which thee ECM would interpret as running lean. If that condition remained long enough, it would throw the LEARN function OFF and default back into Open Loop. W a bit of accelerator, things would come back. You wouldn't feel any difference as it did that, but for purposes of tuning it would throw things off. Some other tuners I communicated with suggested that AC O2 sensors were more consistent than the Bosch so I got two of them off Amazon. Voila! No zeros, no open/closed loop flipping, no going into and out of learn. However, I can't say that I experienced the bog others are sensing. I do see that on closed throttle decel, my WB will sometimes spike to 17 or 18:1 AFR. I wonder if that's not the injector shutting down due to a too small pulse width being commanded, which brings up the issue of the injector offset. Another tuner using the ACCELs in a different motor saw the same thing happening