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Vans & Minivans Toyota Sienna Toyota Sienna Hesitation
21 messages, Last post on Nov 03, 2009 at 7:57 AM
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Replying to: johnsienna (May 21, 2008 10:35 pm) Search/Google for: wwest dbw hesitation abolition
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Here is my conspiracy theory on this matter: http://townhall-talk.edmunds.com/direct/view/.f169148/7 That's just my opinion, though. 
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Replying to: wwest (May 22, 2008 8:29 am)
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Replying to: johnsienna (May 26, 2008 6:47 pm) My guess is that if the '08 owner/driver's can learn to adapt to this new feature the firmware "fix" might be made backwards compatible. The best answer is probably the one that Ford has chosen for the Edge, a variable displacement ATF pump, but that, most definitely, would not be backwards compatible. |
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Replying to: johnsienna (May 21, 2008 10:35 pm) |
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Replying to: johnsienna (May 21, 2008 10:35 pm)
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My 05 Sienna hesitates usually when accelerating after coming out of a turn. Originally, they said the computer may need to be reset. Later, dealer said they did not find a problem but now it is getting worse. Any advice?
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Replying to: arodory (Feb 20, 2009 6:58 pm)
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Replying to: arodory (Feb 20, 2009 6:54 pm) Assume you are accelerating even ever so slightly and accoringly the transaxle is in a lower gear ratio that it would otherwise be at your current roadspeed. If you now lift the throttle SLOWLY the system will predict that you wish to simply begin cruising along and the trnasaxle will shift into the highest gear appropreate to the current roadspeed. On the other hand if you lift the gas pedal FAST/QUICKLY the assumption will be that you wish to slow, perhaps using a bit of engine compression braking, and the transaxle will be more likely to remain in the current "lower" gear ratio. In this latter case, FAST/QUICK release of the gas pedal, and you NOW wish to quickly return to acceleration, there is no gear upshift pending, in process, nor having just completed. So the transaxle is fully "armed"/prepared for even a downshift if that is what is required for the level of acceleration your "new", re-acceleration, gas pedal position dictates. In about 1998 Toyota/Lexus commited to a major (as it turns out more MAJOR then they predicted) transaxle design change mostly in favor of improved FE. The design change resulted in their transaxle's INABILITY to support two gear changes in quick succession in some situations, mostly if the gas pedal has been released into a position that results in an idling engine or almost so.
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