any cossie will idle just fine at 2.5%, but even you should know cat equiped cars cannot run co that high,

i never said it wont idle below 0.90%.... as it does, ...but its not as stable as it is at 0.90% or slightly above.(pre cat)

if you idle at 2.5% and open the iscv to allow say 5%more air, it hardly effects the idle co, now try that at 0.80%, the 5%air makes a huge difference to afr, as it was already weak.

any car, any ecu will become MORE unstable, or MORE effected by iscv movements at lower co levels, its a simple fact of science,
and there isnt a need to run weaker so why bother?, they piss a cat test with cat fitted.but i guess your ecu is capable of more than any car manfacurer ever? as they all run a similar pre cat co level, ive tested hundreds in my time as a technician.

but back to the THREAD why do we need to know about your ecu? he isnt asking about it? every question results in"fit aftermarket ecu" its not related in anyway to the question, which is about co on a good old reliable std ecu