If an engine runs cold and operates in a cold environment, does that mean it will run LEANER or RICHER? Or when you start your motor in the mornings and run for a while, is it running LEANER or RICHER, until it reaches OPERATING TEMPERATURE?

 

maybe a little lean or rich until the o2 sensor warms up.

 

Colder air is more dense so you have greater oxygen volume entering the combustion chamber, hence, you get a more lean condition. That is why the TII uses an intercooler, to cool the air charge for greater density. That's also why an NA engine makes significantly less HP at altitude, less density.

 

The computer uses two intake temp sensors (one in the AFM, one between the intercooler and the throttle body) to alter the amount of fuel to suit the temp. So if all your sensors are OK, it shouldn't matter what the outside temp is.

 

doesnt the fc ecu hav it setup so that if its cold it runs a HELLA rich fuel mixture?

 

The ecu software has lots of air/fuel corrections built in,some are intended to keep the mixture at stoichiometric and some are there to enrich it for driveability.In all cases the basic fuel injection amount is adjusted by changing the time the fuel injectors are open:
air concentration correction-increase or decrease based on intake air temp at AFM
battery voltage correction-ecu measures battery voltage and corrects to maintain injector open time
volume increase immediately after starting-to prevent stalling immediately after starting-based on coolant temp sensor.
warmup volume increase-to improve driveability during cold-based on water thermosensor reading.
engine output volume increase-to improve driveability under heavy load-based on boost sensor and igniton pulse rate.
acceleration volume increase-to improve response during acceleration-based on TPS output and igniton pulse.
high speed volume increase-toreduce exhaust gas temp-based on TPS and ignition pulse.
light load volume increase-to improve driveability-based onTPS and ignition pulse.
idle air /fuel increase-to improve idle stability-based on TPS,ignition pulse and variable resistor setting.
high altitude correction-reduce fuel in thin air-based on atmospheric pressure sensor.
deceleration volume decrease-to improve driveability and increase fuel consumption-based on TPS and ignition pulse.
Then of course there is the O2 sensor and the feed back loop which does not come into to play much because it would defeat the purpose of many of the above corrections.

 

This man knows his wankel!