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Toyota RAV4 Throttle Lag

79 messages,  Last post on Aug 11, 2009 at 7:38 PM

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What is this discussion about? Toyota RAV4, Engine, SUV

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#40 of 79 Re: foot placement on accelerator [bob777] by wwest Sep 13, 2006 (8:02 am)
Replying to: bob777 (Sep 12, 2006 9:57 am) On another forum an owner seems to have discovered that not only does left foot braking often prevent the transaxle from upshifting, the prevention of upshifting leaves the transaxle "set", prepared, to accept a downshift command if/when the next accelerator pedal depression is aggressive.
#41 of 79 Throttle Lag Issue by altared Sep 14, 2006 (5:14 pm)
I have driven my wife's 2006 V6 Limited about 6000 km so far under various driving conditions, both city and highway and have not yet experienced any throttle lag. Vehicle has responded well to passing gear on 2 lane highways, entering intersections from a Stop sign, etc. Feels just like the old fashioned cable system. Whatever the problem is, it is not systemic across the whole vehicle line.
#42 of 79 Re: RAV4 Throttle Lag [steve_] by muckluck Sep 16, 2006 (6:32 am)
Replying to: steve_ (Aug 18, 2006 4:29 pm) I have throttle lag that is intermittent. I am responding now as when the problem goes away it is easy to think that it was in my head. But last night the vehicle was acting fine, accelerating fine; this morning lots of throttle lag. Have had the vehicle a month, and have seen other discussions that talked about vehicle 'learing' how I drive, etc., so was trying to see if that might be the problem; but now with 1800 miles, I am ready to complain. I really dont want to take it to the dealer and get the 'could not duplicate problem' response; but I also dont want to be stuck with a lemon as I only have the first 15k miles to get it replaced. I have submitted a complaint to nhtsa, and have noticed several other complaints of the same problem. Replies to this message: wwest (Sep 16, 2006 9:08 am) jimd4 (Sep 16, 2006 11:42 am) andrew17 (Oct 06, 2006 8:20 am) wwest (Oct 09, 2006 7:38 am)
#43 of 79 Re: RAV4 Throttle Lag [muckluck] by wwest Sep 16, 2006 (9:08 am)
Replying to: muckluck (Sep 16, 2006 6:32 am) The vehicle could be designed to learn each individual driver's style/technique only if we all agreed to be "chipped". Absent knowing what individual is driving at any given time the vehicle must "relearn" your personal style/technique after each engine start driving session.   Which is the way it works. Replies to this message: jimd4 (Sep 16, 2006 11:42 am) andrew17 (Oct 06, 2006 8:20 am) wwest (Oct 09, 2006 7:38 am)
#44 of 79 Re: RAV4 Throttle Lag [wwest] by jimd4 Sep 16, 2006 (11:42 am)
Replying to: wwest (Sep 16, 2006 9:08 am) I guess we will be able to tell if the parking lot guy or the kids ripped the truck huh? When I get in in the AM, the wheels will come of the ground when I try to tiptoe down the street with the V6?
#45 of 79 Re:Solution to RAV4 Throttle Lag [wwest] by andrew17 Oct 06, 2006 (8:20 am)
Replying to: wwest (Sep 16, 2006 9:08 am) RAV4 V-6 AWD (2006): I was told by several people that pulling the CPU (computer) for 5-60 seconds (?) will erase the driving profile from active memory and the throttle lag disappears. (You create a new profile by your own driving habits.)   Could somebody send me a comment? -Thanks for your time and cooperation! Replies to this message: wwest (Oct 09, 2006 7:38 am)
#46 of 79 Re: throttle lag [fordm] by raviola4 Oct 06, 2006 (8:47 am)
Replying to: fordm (Aug 27, 2006 11:48 am) I know i've written to Toyota, and have filed a complaint with NHTSA. Toyota says "normal". I've had 4 instances since buying the car in March i deem serious. Scariest was merging in traffic going 50-60 mph from a slow crawl, plenty of room to merge, but literally nothing from Rav when i pushed accelerator pedal, panic, pushed harder, downshifted yada yada. This also was noted as normal. So when the first person dies from trying to merge as i did and gets clobbered in the side by an 18 wheeler, will Toyota also claim "Normal". Replies to this message: user777 (Oct 08, 2006 5:07 am) edr5 (Sep 28, 2007 5:50 pm) user777 (Sep 29, 2007 1:21 am) cbmorton (Sep 29, 2007 12:42 pm)
#47 of 79 Re: throttle lag [raviola4] by user777 Oct 08, 2006 (5:07 am)
Replying to: raviola4 (Oct 06, 2006 8:47 am) toyota recently issued a TSB for improving the shift / operability in the new Camry models. Look in the 2007 Camry Woes forum. perhaps your vehicle is or will be a reflash candidate.   there's speculation that under certain conditions, the Camry was programmed to be too lean (fuel / air ratio).   hard to say, we don't have specifics on the TSB.   maybe you can contact your dealershop or corporate and ask them if the same issues the people with the Camry are experiencing with their transmission / accelerator are being researched by Toyota for the RAV.   perhaps a little research on your part (maybe with the help of someone else if necessary): determine for the Camry I4 if the transmission and ECU/PCM (Engine Control Unit/Powertrain Control Module) are the same part number as in your RAV. that might give reason to be hopeful that the re-flash might improve operability of your ride.   good luck.
#48 of 79 Re:Solution to RAV4 Throttle Lag [andrew17] by wwest Oct 09, 2006 (7:38 am)
Replying to: andrew17 (Oct 06, 2006 8:20 am) None of the ECUs will "remember" personal, individual, driving habits/style beyond removing the ignition key, otherwise the "next" individual driving that vehicle might experience some rather "strange" ECU responses.   If you remove the battery connections for a period of time, say 15 minutes, the ECUs will need to relearn, recalibrate, some of the individual sensor parameters and that might change the vehicle "reactions" until the recalibration has completed.   But thereafter....   There is some evidence indicating that following the battery disconnect procedure each and every night helps to alleviate the engine/transaxle downshift delay/hesitation for most of the next day's use.
#49 of 79 Ford's "fix". by wwest Oct 17, 2006 (11:43 am)
Impossible to believe...   Ford has the answer.....!   From the new 2007 Ford Edge PR..   "The electronically shift controlled transmission also features a variable displacement pump, which matches the amount of fluid that gets pushed through the transmission to driver demand, making it more efficient."   At full lift-throttle all of the FWD Toyota/lexus vehicles begin an upshift just as the engine RPM drops to idle. With the engine at idle the upshift will exhaust/use most, or possibly all, of the pressurized ATF.   Now if you happen to re-apply foot pressure to the accelerator pedal just as the upshift begins the engine/transaxle ECU will "know" to delay the onset of engine until the low engine "idle" RPM can build enough ATF pressure to complete the corresponding downshift.   The most obvious answer would be to increase the volume of the fixed volume ATF pump so enough pressure/flow could be provided for two sequential QUICK shifts with the engine at idle. But then most of that added volume would be bypassed, disapated as heat, as the engine RPM rises above idle.   Ford's answer, apparently, is to have a variable displacement ATF pump so it can be switched to high volume when quick/SOLID shifting is required with the engine at idle. Makes me wonder if that allowed them to eliminate the ATF pressure bypass relief spring/valve also.   That would REALLY increase transaxle efficiency.   A second option would havre been to have an ATF pressure storage accumulator (like the ABS pumpmotor asembly). But putting one of those in an already "crowded" six-speed transaxle is probably out of the question.   Anyone know if any of the newer Toyota/Lexus transaxles have either? Absent one or the other the delay/hesitation issue will undoubtedly continue.

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