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coolant temp

  Clio 1.8 16v

what has this got to do with fueling?it is on BBtunings website under fueling n e 1 got n e ideas?

Im guessing, its because the coolent temp sensor sends information to the ecu, about how cold/warm the engine is, and the ecu adjusts fuelling accordingly.
  Skoda Fabia vRS

yea, if its knackered your car wont be runnin right, its a very common problem on Renaults, my local dealership sells about 5 a day of em

I agree. Especially on startups where the mixture would need to be much richer (similar to a choke on carbed up cars!). If fcuked your car could be running permenantley rich or much worse lean!!
  Nissan R35 GT-R

As stated, the coolant temperature is reported back to the ECU so that more fuel can be added, as when the engine is cold, only the lightest parts of the fuel actually mix with the air and burn. This is why the car runs very smokey when cold.

The ECU is given a percentage to increase the number in the map by for every 10 degrees for the current speed and load site. For example 100% will increase a 20ms fuel pulse to 40ms (double).

Most ECUs also control the ignition timing. In cold conditions, a spark is required sooner as the mixture is not nearly as volatile as it is when the engine is warm.