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Sedans Toyota Avalon 2008 Toyota Avalon
639 messages, Last post on Dec 04, 2009 at 2:01 PM
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Replying to: ncee (Jan 31, 2009 4:54 am)
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Replying to: joshuag (Feb 05, 2009 10:50 am)
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Well hopefully I find out today. I just dropped it off, for the 3rd time. The first 2 times they said they couldn't find anything. On my way to the dealership, I heard it 8 times, including once turning into the parking lot. I had them take a ride with me, right then, and we turned left twice. Once out of the parking lot, and once back into the parking lot (all in the span of 50 yards) - it made the noise both times, and more then loud enough to hear. He said "Well I heard it, you are not crazy". "This will make it easier to figure out". Here's hoping. Skip |
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Replying to: tkevinc1 (Feb 06, 2009 5:46 am) But with the very same 1-2 second transaxle downshift delay/hesitation according to the description for the (same..??) new 6 speed in the 2010 RX350. The problem arose from Toyota's adoption of "real-time" ATF line pressure control along with "abolition" of the ATF line pressure accumulator back late in the last century. With no accumulator and the engine at idle or nearly so the ATF pump can not be relied upon to supply quick "make-up" line pressure, say when two sequential gear changes are required in QUICK succession. Ford is using the same FE improving technique but with a variable displacement ATF pump so "high" pump volumes/pressures can still be attained with the engine idling but virtually nil at high engine RPM. |
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Well they ordered a axle today, and when it comes in, and they then take it apart, they will see if thats the problem. They said everything pointed to the axle, but if they take apart I would be without the car for a few days? They didn't have a car they could let me use for a few days??? Now if that isn't the problem when the part comes in, the will have to provide me with a loaner, as my car will be torn down. They said the part should be here next Tuesday, and unless something happens before then, I have an appointment to drop if off next Friday afternoon. I'll let folks know the out come. So based on the above comments, this may be a temporary fix? Replacing the part, but not fixing the issue surely isn't the way to FIX the problem … or is it? Skip |
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Replying to: ncee (Jan 31, 2009 4:54 am) It is very possible the noise you hear coming from the front left corner of your vehicle is that of the brake actuator motors for the ABS, traction control and VSC systems, which are controlled by solenoid valves. The valve themselves are a little bit noisy, with the motors being the noisiest. This operation is required in order to monitor the integrity (safe/fail) of the above systems. I do hear a subtle grinding noise coming from the front left side of my car, but I’m confident there’s nothing wrong with it. Now about your transmission: The anchor-dragging effect you feel when you release the gas pedal is normal. Upon releasing the gas pedal your automatic transmission downshifts in order to slow down the car. The Avalon transmission has high gear ratios on the low gears, specially the first gear (3.30:1). In other words this means, the higher the gear ratio the stronger the “engine-braking” force will be. It is that force you feel that is effectively slowing down your car dramatically, which is primarily due to the high gear ratios on the reduction gears. If you are very familiar with all these concepts I can give you more in-depth details of how the Avalon’s tranny works. I also have the same experience with my transmission, but I’m confident there’s nothing wrong with it. Another point you should know is, when the engine coolant and transmission fluid temperature is cold your tranny will cycle between first, second and third gear only; the colder the temperature the longer the tranny will remain in this state. This restriction makes the tranny behaves a bit "abnormal"; however, when the vehicle reaches operating temperature (gauge temperature needle in you dash is half-way) your tranny will cycle through any gear depending on your speed only. Amaury '08 Limited |
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Replying to: amauhry (Feb 06, 2009 2:40 pm) NOT, NO, NEVER...!!! There are NO automatic transmissions and absolutely NO FWD or F/awd modern day vehicle that will automatically downshift when the driver releases the gas pedal. For FWD or F/awd that would be 'way too dangerous. Almost all transaxles will actually upshift in this circumstance. On the other hand if you should apply the brakes even ever so lighty you might encounter this "anchor-dragging" effect. On the "third" hand, if the gas pedal is released QUICKLY while the transaxle is still in a low gear (1st..??) the ECU will assume the intent is to slow the vehicle using engine compression braking and remain in the lower gear. But an actual downshift, not..!! Unless you then apply the brakes, maybe.
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Replying to: wwest (Feb 06, 2009 7:10 pm) My 07 Avalon was the first vehicle I have owned that utilized this feature, and it seems to work rather well. The braking effect is more noticeable at lower speeds. |
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Replying to: amauhry (Feb 06, 2009 2:40 pm) As for the anchor dragging effect … I don't like it. I better understand it now, but I don't like it. I would think the car would get much better MPG if it didn't do this, and I never heard anyone say, they wish their car did it, and if it had, they would not have had that accident. But I know living in an area with tons of hills / mountains, I would much prefer if it disengaged when I let up, so that I could go to the road and take advantage of coasting. Skip
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Replying to: ncee (Feb 08, 2009 3:56 am) That said, my '07 Limited does, on occasion, at certain speeds, while slowing under certain conditions, actually go to 4th gear from 5th for no reason. On rare occasion it has even gone from 4th to 3rd for no apparent reason. If anyone else observes this illogical behavior, you are not alone.  And, never allow an AT car to disengage or "coast" in neutral. There are multiple risks in this, not the least of which is lack of vehicle control. There is no direct clutch as in a manual shift to connect the engine to the road and help control the car. Allow the top gear to work and drive "connected". Enjoy the Avalon..... great car.. !
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