Bogs for a second and then takes off - ZR-1 Net Registry Forums

Marc Haibeck · 10-18-2014

Dominic,

I installed Bosch 13077 (similar to the OE sensor) and then the oxygen sensor performance was excellent. They solved the bogging problem.

In general, I think that the control system is not very good at fuel corrections that are greater than -10%. Then maybe it overshoots the adjustment and goes too lean. In the future when encountering the lean out problem, I'm going to adjust the AFR into the 13.2 to 16.1 range with my wideband and with the system in open loop. Then go to closed loop and make fine adjustments.

I have seen the deceleration trims in the 90's on some cars. I too think that it could be a fuel injector low flow limitation. Excellent oxygen sensors will help there too.

10-18-2014	#15
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: Bogs for a second and then takes off Dominic, I installed Bosch 13077 (similar to the OE sensor) and then the oxygen sensor performance was excellent. They solved the bogging problem. In general, I think that the control system is not very good at fuel corrections that are greater than -10%. Then maybe it overshoots the adjustment and goes too lean. In the future when encountering the lean out problem, I'm going to adjust the AFR into the 13.2 to 16.1 range with my wideband and with the system in open loop. Then go to closed loop and make fine adjustments. I have seen the deceleration trims in the 90's on some cars. I too think that it could be a fuel injector low flow limitation. Excellent oxygen sensors will help there too.