Last post on Sep 30, 2010 at 1:44 PM
You are in the Toyota Camry
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Toyota Camry, Sedan
#9 of 48 Re: 2005 Toyota Camry jerkiness. [camry2]
Sep 05, 2005 (6:28 pm)
If you are going down a hill that's steep enough when this occurs, the "grade logic" feature in the automatic transmission may be downshifting the tranny from 5th gear to 4th, or sometimes even to 3rd. You can tell by checking your tachometer. This is more likely to occur if you tap the brake pedal, because this signals to the car that you want to slow down going downhill.
#10 of 48 Re: 2005 Toyota Camry jerkiness. [camry2]
Sep 12, 2005 (7:17 pm)
I have a 2006 SE with the same symptoms at 1300 mi. It almost feels as though the trans. is sticking between gears when trying to decelerate or even maintain a speed of 38-40 mph. Maybe this is a characteristic of the 5-speed automatic? I'm gonna have mine checked sometime soon.
#11 of 48 Re: 2005 Toyota Camry jerkiness. [beetledog]
Jan 19, 2006 (12:37 pm)
I bought a 2006 Camry LE in December 2005. I am at 1350 miles and I took my car in for the same problem - jerking transmission, down-shifting instead of coasting down hills, etc. Service Rep claims it is designed to do that, has an automatic fuel shutoff when you lift off the accelerator to conserve gas, which cause engine drag. Also claims it is "normal" for car to switch back and forth between gears at around 35-40 mph when accelerator steady on flat road. I have called Toyota Customer Experience line (800-331-4331) and started a case. This a serious issue - I personally don't feel safe driving a car that can't decide what gear to be in.
#12 of 48 Re: 2005 Toyota Camry jerkiness. [msmcg1]
Jan 19, 2006 (4:42 pm)
Your dealer's service rep. is telling you the honest-to-gosh truth. (and I'm NO fan of car dealers!) In addition to four or more forward gears, modern automatic transmissions also have a mechanism that "locks" the rotational speed of the torque converter to that of the engine giving direct 1:1 mechanical efficiency. Guess what speed the torque converter lockup takes place? Yep, 35-40 mph. It feels like an additional shift - and the engine revs drop by about 200 RPM, too. Start likin' it, or at least get used to it. If you're driving right in that speed zone, the transmission will "hunt" back and forth on mild grades as the car speed drops or accelerates slightly. Either slow down, speed up, or drop out of overdrive if you find the sensation annoying. My current car, an '03 Sonata does it. My former car, a '96 Accord did it, too. It's not a Toyota thing. Your "case" will go nowhere fast.
#13 of 48 Re: 2005 Toyota Camry jerkiness. [msmcg1]
Jan 19, 2006 (7:02 pm)
My '05 Camry with the 4-cylinder, 5-speed auto downshifts automatically from fifth to fourth or even third, depending on the steepness of the downgrade and the car's speed. I like this feature, because it means I don't have to brake unnecessarily or downshift manually. But mine seems to downshift only if I hit the brakes at some point during the downgrade, which I assume signals to the computer that I don't want the car to continue gaining speed.
I do not believe my '04 Camry, with the same engine but the older 4-speed automatic, does this. OTOH, with only 4 forward gears, just a press of the overdrive lockout button gets you down into third if you want engine braking on steep downgrades.
#14 of 48 Re: 2005 Toyota Camry jerkiness. [msmcg1]
Jan 21, 2006 (2:47 pm)
While haefr's reply certainly sounds technically viable to me, you might want to ask your dealer about his opinion on TSB TC005-05 which, although currently targetting the '04 & '05 models, I'm led to believe it applies to the '06 models as well (there's also an equivalent for the '03 models, but I don't have the numbers handy).
In the introduction, it lists the following "issues":
- downshift lag when accelerating at speeds from 10 to 20mph
- gear hunting when driving on/off accelerator pedal at 20-30mph
- response rate during heavy acceleration from a stop
While this TSB *may* not be applicable to what you're describing, and I'd pretty much expect any dealer to say something like that regardless, you gotta admit it sure looks related.
#15 of 48 Re: 2005 Toyota Camry jerkiness. [bpsmicro]
Jan 22, 2006 (8:16 am)
I had this done to my 04 V6 Solara and wow!...it's a whole new car.No more throttle lag,totally happy now.I would suggest this to all 04/05 Solara/Camry owners.
#16 of 48 Re: 2005 Toyota Camry jerkiness. [bpsmicro]
Jan 22, 2006 (9:55 am)
Googled for "Atkinson cycle" & "intake noise".
I was curious if the intake noise from the Atkinson cycle's reverse airflow, combustion chamber back into the intake manifold, in a 3.3L V6 might be at least part of the reason the RX400h doesn't make use of this fuel economy method.
July, 8th, 1999 Final report by SRI, Sierra Research Inc, on "Alternative and Future Technologies for Reducing Greenhouse Gas Emissions from Road Vehicles"
One of the conclusions is that if the industry switched to 5-speed automatic transmissions, made use of ASL, Aggressive Shift Logic (quicker upshifts), early torque converter clutch lockup, and shift into neutral with brake application and engine at idle, a 9.8% improvement in fuel economy would result. Industry response was that "driveability" would suffer.
Welcome to 2006.
#17 of 48 Re: 2005 Toyota Camry jerkiness. [2k1trd]
Jan 23, 2006 (2:51 pm)
I'm curious how you approached the dealer on this. I've heard that some service managers take a dim view of customers who actually know how to look up TSBs.
I'm trying to decide whether to just go in with my printed copy and say "do this please", or whether I should go in with a carefully worded complaint that'll make it easier for them to magically find the TSB themselves when they look for it. If they can't find it, then I can produce the copy I printed out "for their convenience".
I have <6000km on mine, and this is supposed to be a warranty item. I'm not rushing because I want to wait a teensy bit longer to see if anything else shakes out. After 20 years of Toyota ownership, I don't believe I've ever made a warranty claim before. Brad.
#18 of 48 Re: 2005 Toyota Camry jerkiness. [bpsmicro]
Jan 23, 2006 (3:36 pm)
Then find a new dealer, quickly.