Quote:
Originally Posted by MetroMPG
That's a really interesting specific case (with the transmission being held in a lower gear, or preventing torque converter lockup, below a certain coolant temp). If your drive takes you out onto the highway soon after starting, it seems possible.
It'd be interesting to see this tested.
Of course, a coolant heater is still the best option!
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What is it that you would like to see tested? I have two Toyotas that do it of my own, and my parents both own Toyota Camrys, they all do the same thing for holding 3rd gear till the temp gauge just starts to move.
On my corolla... right when the temp on my scan gauge says 130, it instantly shifts, this has been done several times, and when i'm running late, it will R around 3k rpm for 60mph and still won't shift till it heats up. I'm not sure what temp the Camrys require since they are older than 96 and I can't scan them with my scangauge.
I did a quick search and answers seem to say it is either to prevent engine damage or for emission control. I would guess emissions since reving the engine when it is cold I would think would be more damaging than having it work harder at a lower speed in overdrive.