Quote:
Originally Posted by Tcoat
Once the engine is warmed up it doesn't matter if it is 50 or minus 50 out. It will run exactly the same. Was minus 12 here yesterday and mine ran the same as it does in August once it warmed up. Now the interior creaks, clicks, squeaks and rattles you get at that temperate are a whole different matter.
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Ambient temp is one of the variables the ECU uses to determine several engine parameters, including A/F ratio. The engine definitely runs richer at lower ambient temps.