Carmakers set up the car to do lots of things I don't care for during warmup. My Subaru idled very high and ran very rich (I could smell the HC emissions plainly) to guarantee a warmup without ever stalling or stumbling. The Subaru's programming went overboard with its warmup programming, and an adjustable pot on the dash would be just about perfect for toning it down a little. Or maybe just a resistor on a toggle switch in parallel with the CTS.
The Insight has a different problem. It considers initial coolant temperature and ambient air temperature when deciding whether it's okay to lean burn and auto stop. Well, I want lean burn sooner, so I'll see if I can fool it into allowing that.
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