Why does van hesitate when stepping on gas after coasting ?
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Why does my 2006 Sienna 3.3L auto transmission usually hesitate for a second ot two when stepping on the gas after coasting (i.e. taking foot off gas while turning a corner while van is still moving and stepping on the gas again)? It happens about 90% or more of the time. It happens when engine is warmed up. Engine RPM's rise about 100 to 200 when I step on gas without transmission engaging. Then while the van is still rolling forward in Drive transmission kicks in with a jerk and van starts to accelerate again. I have no transmission problems that I'm aware of and all maintenance has always been performed as scheduled. Van currently has 113,301 miles on the odometer. My dad's V8 Tundra automatic does the same thing. I've been driving this van for a year and it had just under 100,000 miles on the odometer at that time. The van has had this problem from the time I started driving it. The check engine light is off as well as all other warning lights. The van has always passed Illinois emissions tests. I use regular unleaded fuel, 87 octane, and STP total fuel system cleaner every 3,000 miles.
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If in fact you have a problem with the transmission driving it for a year will not help it so getting it to a shop is advised. Driving it will only make it worst.
This almost sounds like low fluid but if u had a leak by now it should not move if all the fluid leaked out. the best method to determine the problem is by datalogging the transmission as the problem happens this will show a commanded gear if at the moment it commands the gear it takes some time to actually engage then u have a problem with the transmission. this should be picked up by a proper scan tool. hope this sheds some light on the problem.
