Can someone tell me, on cold start, does the ECU run on CTS values only and ignores 02 sensor values completely?

Anyone? Mr Dixon?

Bump

free bump for si!

I can tell you that the injectors fire on both strokes to increase the amount of fuel, rather than sequentially.

 

Maybe I'm having a bit of brain fade, but what's CTS ?

 

The O2 sensors are on a closed loop system and do nothing after about 3000rpm, I doubt they do much at all on a cold start. They do have heaters though which enable them to start functioning sooner than that non-heated types.

CTS = Coolant temperature sensor. I have one O2 sensor that is reading out of range and thus over fueling. I find the car far more responsive and quicker on light acceleration when cold than I do when the engine is at temperature. So I am guessing this is totally the fault of the O2 sensor.

Can someone tell me, on cold start, does the ECU run on CTS values only and ignores 02 sensor values completely?

Yes as there is a value in the ECU which tells it at what engine temperature to start using the O2 sensors. The UK / Jap / US ECU's have different values for this as they all have different emmision laws.

Right I see. Because my CTS is reading correctly and not over fueling at that point as 02 sensors are on closed loop, I'll be feeling a difference in performance. New 02 sensor time for sure then. Just need to isolate which one. Might get Datscan! LOL