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Hi, how can i disable the closed loop? can I just simply unplugged the O2 sensors socket to let it run in open loop full time? or is there an other way to disable the closed loop?

Before other people come on to tell you that the reason why you've lost low-end power is due to a loss of 'back-pressure' from removing the cat, I suggest you check that the oxygen sensors in your exhaust system are all plugged in properly. In addition, even if your sensors are all properly installed, perhaps your ECU needs a little time to adjust to new, more 'free' exhaust. Also, you've not mentioned what you mean by having your cat removed. Did you have it cut out (and replaced with a welded in pipe) or did you have some after-market exhaust component installed that doesn't have a cat or something else (ie. installing a dummy cat, something that looks like a cat but does not have the pollution filter element inside). ← yes, I hav it cut out and replaced with a welded in pipe also a Trust muffler at the back. should i receive the warning light if my o2 sensor are not plugged in properly? as i cant see any red light show on my dash. I hav reset the ecu right affter I removed the cat converter.

my car is an Altezza with tritonic gear, I had my catelytic converter removed last week, now my car does not respond very well in the low end. for example, when I try to over take the car in slow traffic the gas pedal is being pressed but the power came a bit later. why is it happened? the car respond very well in the high end but it really suck when you drive it in slow speed.

no, i had more then a few tanks of gas. I only removed the two cat convertor, that is all.

Help! I drive an Altezza, recently my car started to ***** and have lots of back fire when driving slow or up hill... I got to press down the gas pedal pretty hard to get rid of the jerking and back fire, i also heard noise from somewhere around the throttle body.. it is getting worst everyday! what is the problem? air flow sensor? ecu? or the throttle body?? anyone can help? (sorry for the poor english grammar and spelling)