I have a '92 Toyota Pickup. For several years now it has been taking a very long time before it will shift into overdrive. Based on what I've read on the internet, Toyota uses this feature to control emissions, however, my truck takes an inordinate amount of time to reach the point where it will shift into OD... I can let it idle for 30 min, and it will still take 3 miles or more of running at 4000 rpm before it will shift up. I took the truck in to the toyota dealer, and they claimed that there was no problem; I replaced the thermostat, and it still hasn't helped. What else can I try to get this fixed?
Thanks for your help!