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Sedans Toyota Avalon Toyota Avalon 2005+ Transmission Questions
374 messages, Last post on Apr 21, 2009 at 6:25 AM
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The Lexus 300 and 330 both have had throttle and transmission hesitations problems and complaints for the past three or four years. Do these problems also exsist on the 05 Avalon? Do they exsist on the Camry? |
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Replying to: tedescm1 (Oct 03, 2005 11:55 am) Don't know about Camry. Again, read all posts, ask a question when you have one. 
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Replying to: tedescm1 (Oct 03, 2005 11:55 am) |
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Replying to: tedescm1 (Oct 03, 2005 11:55 am) |
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Replying to: scoti1 (Oct 05, 2005 4:43 am) This problem has exsisted for 2 or 3 years...how come they can't fix it?
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Replying to: tedescm1 (Oct 05, 2005 6:57 am)
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Replying to: scoti1 (Oct 07, 2005 6:24 am) |
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Replying to: scoti1 (Oct 07, 2005 6:24 am) How difficult can this be to correct? Don’t they care about their customers? |
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that somewhere back in about 2000 Toyota discovered the fuel economy could be increased and emissions reduced the more often the vehicle was run in the highest gear seemingly appropriate. So, when you relax the pressure on the gas pedal the system says "ahah, he's through accelerating and now just wants to cruise along at this road speed". Or if you happen to fully release the gas pedal the ECU decides that what you really want is to coastdown to a lower speed and shifts into a higher gear to allow the engine to turn at idle RPM or close thereby. Both of these actions would undoubtedly contribute to better fuel economy and lower emissions. Possibly making the difference between the vehicle being rated as conforming to ULEV emissions standards or not. But there was a fly in the ointment. Transaxles began to fail prematurely due to the need to quickly downshift if the driver suddenly changed he/her mind and now wanted to accelerate. The transaxle has just upshifted, and now the transaxle must (immediately) downshift with the hydraulic pressure having been depleted and the engine now at ~idle. With the engine RPM and torque now climbing rapidly and the transaxle downshift clutches not fully and firmly seated there will be an inordinate level of clutch wear. What to do?? Go back to not upshifting and the EPA and/or CARB fines might be enormous. And the PR....?? Oh, if we convert these vehicles to DBW, e-throttle, then we can delay the onset of engine torque until those clutches have time to fully and firmly seat. Problem solved! Just as Toyota has now stated publically, the engine hesitation is a design "feature" to protect the drivetrain. |
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