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Sedans Toyota Camry 2007 Toyota Camry Transmission Questions
851 messages, Last post on Nov 01, 2009 at 2:21 PM
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Apparently our car is afflicted with the flare issue although I have noticed this only happens during deceleration, i.e. slowing down for a stoplight etc. Although I’m not familiar with the logic of the shift pattern, it appears the transmissions attempts to uncouple or free wheel while the car is slowing down or in the process of coming to a stop. This seems to be different behavior from what I have seen others describe although our VIN number is lower than the 4T1BK46K#7U530472 that was listed in the TSB at this link http://www.alldata.com/tsb/Toyota/1169193600000_1169625600000_TC002-07/2071.html- - so it appears to be within the defective range.
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Replying to: rugbyman (Jan 31, 2007 7:26 am) If for some reason you wish to have engine compression braking there is usually a special procedure for that in your owners manual. This is most noticeable as a feeling of being "bumped from behind" just before coming to a full stop or as sort of a "slingshot effect" upon a full lift-throttle coastdown event at 30-45MPH. There is also the case, sudden RPM change, of converter clutch lockup being disabled the instant you apply the brakes but that one has been around since lockup clutches first came into use. IMMHO none of these are related to the 3-4 upshift flare being described as problematic.
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Replying to: wwest (Jan 31, 2007 10:18 am)
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Replying to: rugbyman (Jan 31, 2007 12:47 pm) Think of the operation of a manual transmission, pushing in the clutch to shift at the end of an acceleration......but keeping your foot on the throttle, and then because you shift slowly the engine over revs before you let out the clutch again. If you troll thru the earlier transmission posts, I suspect you'll still find the video.
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Replying to: wwest (Jan 31, 2007 10:18 am) both honda FWD vehicles with ATs that I own WILL NOT prematurely shift down or dis-engage the torque convertor lockup simply because you let off the gas. i will have to check, but i don't think they will shift or disengage just because i apply the brake, providing the vehicle engine rpm and gearing and unit speed are still compatible. are you saying all vehicles do this immediately, or that in the effort to maximize FE, the toyota attempts to "coast" by going to neutral or something to avoid compression braking? you've lost me.
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Replying to: user777 (Jan 31, 2007 3:36 pm) I said NOTHING about DOWN-shifting or disengaging the lockup clutch due to letting off the gas. The brand new FWD 2007 Mitsubishi Eclipse Spyder, ~1500 miles, I rented at Daytona over the weekend would ALWAYS upshift as the car slowed to about 10 MPH. By the way my definition of DOWN shift means going from OD to 4th to 3rd, to 2nd...etc.
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Replying to: wwest (Jan 31, 2007 7:31 pm) not sure i'm buying the lockup clutch always disengaging on brake application argument.
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| Day 2 with my replaced transmission and all is well. I got my 07 XLE-V6 back yesterday and it drives better IMO than before. Shifts are more defined than the original transmission and best of all No RPM flare (so far... I'm keeping my fingers crossed). I will post again after a few more days of driving. I was worried that a replacement transmission would not fix the problem since I have read many posts of other unsuccessful attempts at fixing the flare. Both my wife and I drive the vehicle and both of us with totally different driving styles would intermittenly experience the RPM flare on when we drove the vehicle. For us, it took numerous trips to the dealer, the TSB valve body replacement, test drives with everyone from the techs to a Toyota Rep, and finally a replacement transmission. Not the best experience but they may have saved a Toyota customer. Only time will tell... | |
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Replying to: user777 (Jan 31, 2007 9:11 pm) After some research on the RX back when it proved to be that the transaxle was upshifting. So my statement about the Spyder is really only an educated guess. One of the functions of a torque converter is to replace a manual clutch when the car is stopped and the engine is running. At low engine RPM the torque converter, SLUSH PUMP, design is such that there is very little coupling of energy from the engine to the transaxle input shaft. Where the lockup clutch (solid coupling!) to remain engaged as the car comes to a stop, or the driven wheels, due to slippery conditions the engine would stall. |
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Replying to: 1sttoyotaowned (Feb 01, 2007 7:16 am)
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