lean on closed loop

infra · Post by **infra** » Mon May 09, 2005 11:07 pm

Hi,
I?ve spent some time now to tune my "crusing areas" in open loop and is quite satisfied with the tune.
I change the last rich areas and enables closed loop.
And everything goes extremly lean.. i get AFR up to 18 when driving around where its been 14-14.5 on open loop.

first time i enabled closed loop i thought i made something wrong and just used the old map, but this time i checked everything and same result, going lean as hell...

any ideas what could cause this?

im using a PLX M-500 as o2 sensor, do i have to use stock when running closed loop or atleast connect the narrow output? or can hondata still handle the wideband output in closed loop?

CivicVTi · Post by **CivicVTi** » Tue May 10, 2005 3:42 am

You have to use the narrowband output of the PLX. Otherwise the 02 voltage is too high in the wideband output (above 1volt) causing the ECU to think you run too rich and thus decrease fuel. Use the narrowband output or a stock o2 sensor and reset the ECU.

infra · Post by **infra** » Tue May 10, 2005 3:44 am

so changing the o2 sensor in settings is just for datalogging to be correct?