Ciper : ya, it was just for testing...
but you know, air is cleaner here in Quebec that in San-Francisco
HIHO : yes that's the point, this non-calculated air leans the mixture and makes the car run well..
In fact, my question was not exactly what i wanted to say... i dont plan on running the car like that! but i want to know what's could the problem be, that without the bypass hose the car run great.... it's clear it a air/fuel mix problem, but what can control that ? what sensor can fail and make that mix to rich ?
with the mix leaner, it is less difficult to ignite.. so at high RPM, the explosion is quick and good... not the same as for the 'normal mix' ... wich seems to cause some .. missfire or ignition to late
like i said, i'll need a EGT and a S-AFC i think to control that mixture and make the car run clean... cuz now it doesn't.. (run clean/strong/constant)