I own a '93 4Runner/V6/4WD/auto that displays the same phenomenon. When I inquired about it, I was told that there is a temperature sensing switch in the OD circuit that will not allow it to go into OD until a present temperature (transmission fluid?) Is reached. In other words it is operating normally. We live in an area that is very hilly, so I don't use OD until I get to the flatlands. It takes longer in winter than in summer before the trans shifts into OD.
I hope this is accurate, but check for some professional validation.
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Sunday, March 30th, 2008 AT 9:12 AM