I recently had the 4speed automatic transmission rebuilt in my '98 Honda Accord. It works great, with the exception of when it’s cold. When I first start up in the morning, it will briefly “miss” the shift from second to third.(The engine will rev, then it will connect-it will generally do this only one time.) Once the car warms up, no problem. I know that I could just let the car warm up before using it, but I’d like to get this issue resolved. Any ideas what may be causing it?
Warming up the engine before driving has NO effect on the transmission. The transmission only warms up with use, when you drive the car.
If a newly-rebuilt transmission does not shift correctly, you should go back to whoever rebuilt/installed the transmission and see if they can correct the problem.