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Toyota Sienna Hesitation

27 messages,  Last post on Jul 28, 2012 at 2:44 PM

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What is this discussion about? Toyota Sienna, Van

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#1 of 27 2008 Toyota Sieanna - "The Hesitation" by johnsienna

May 21, 2008 (11:35 pm)

I just bought 2008 Toyota Sienna on February and experienced the hesitation when I tried to accelerate my vehicle after slowing down at the intersection at the speed between 5 to 10 mph. When I stepped on the gas at the speed I mentioned above, the engine seemed to roar up, but my car didn't move, and for a few second later it took off. It is intermittent. I had it serviced at the dealer I bought it from, but did not find any thing wrong. And I've been told by a few people including a service manager at the dealer that it is normal. They kept telling me that the new Toyota Siennas are computerized connecting the gas pad to the fuel injection. Because the signal has to move from the pad to the computer and to the fuel injection, that why a few second delay occured. I'm not a mechanic, but I know enough to understand how the computer works. Yes, there is a delay between touching the keyboard and printing data on the monitor. But as a users or the drivers, the delay should not be noticable. The service manager told me the specialist from Toyota come to dealer once a month and will have them checked my 08 Sienna. I also reported this issue to Toyota customer support. They documented the problem on my car and will set up to have my car checked at the dealer. It've been almost a month already, I have never heard any thing from them.
 
I just want to know if there are any 08 Toyota Sienna owners out there have experienced the same problem as I do.

#2 of 27 Re: 2008 Toyota Sieanna - "The Hesitation" [johnsienna] by wwest

May 22, 2008 (9:29 am)

Replying to: johnsienna (May 21, 2008 11:35 pm)
Causative factors goes all the way back to '97, flawed transaxle design for the new RX300.
 
Search/Google for:
 
wwest dbw hesitation abolition

#3 of 27 Conspiracy Theory by ateixeira

May 22, 2008 (1:49 pm)

Here is my conspiracy theory on this matter:
 
http://townhall-talk.edmunds.com/direct/view/.f169148/7
 
That's just my opinion, though.

#4 of 27 Re: 2008 Toyota Sieanna - "The Hesitation" [wwest] by johnsienna

May 26, 2008 (7:47 pm)

Replying to: wwest (May 22, 2008 9:29 am)
Is there any fix for this kind of problem?

#5 of 27 Re: 2008 Toyota Sieanna - "The Hesitation" [johnsienna] by wwest

May 27, 2008 (10:47 am)

Replying to: johnsienna (May 26, 2008 7:47 pm)
Some of the Toyota and Lexus FWD & F/AWD '08 models have a new firmware feature that tries to judge the driver's intent by watching the rate at which the gas pedal is released. Fast and quick equals a wish to slow and therefore the transaxle will remain in a lower gear, slow and easy and it will upshift.
 
My guess is that if the '08 owner/driver's can learn to adapt to this new feature the firmware "fix" might be made backwards compatible.
 
The best answer is probably the one that Ford has chosen for the Edge, a variable displacement ATF pump, but that, most definitely, would not be backwards compatible.

#6 of 27 Re: 2008 Toyota Sieanna - "The Hesitation" [johnsienna] by lmo2

Jun 29, 2008 (6:02 pm)

Replying to: johnsienna (May 21, 2008 11:35 pm)
I have a 2008 Sienna Limited, bought in march. After about a month the check engine light and VSC light came on, I went to toyota twice . they told me it was because the gas cap was not put on correctly. Then I was pulling into a parking space and the van jumped foward and smashed into a parking pole. I brought it in and they told me the axel was not secured and I had leaked out all my transmission fluid!! They fixed it, supposedly, but now I constantly feel that hesitation. I am so frustrated and after reading many of these notes I am scared to drive it. We have been on the phone with toyota for a week and they are ..."looking into it". Has anyone had their toyota replaced because of these issues?

#7 of 27 Re: 2008 Toyota Sieanna - "The Hesitation" [johnsienna] by arodory

Feb 20, 2009 (7:54 pm)

Replying to: johnsienna (May 21, 2008 11:35 pm)
I have a similar problem with the hesitation except I do not hear the engine race nothing happens during the hesitation delay...then it suddenly goes. They said the computer may need to be reset. Yours sounds like a transmission issue I have with my Honda. Did they resolve it yet?

#8 of 27 Hesitation by arodory

Feb 23, 2009 (10:37 am)

#9 of 27 Hesitation by arodory

Feb 20, 2009 (7:58 pm)

My 05 Sienna hesitates usually when accelerating after coming out of a turn. Originally, they said the computer may need to be reset. Later, dealer said they did not find a problem but now it is getting worse. Any advice?

#10 of 27 Re: Hesitation [arodory] by ateixeira

Feb 23, 2009 (10:37 am)

Replying to: arodory (Feb 20, 2009 7:58 pm)
Roll in to the throttle gradually. I think a large part of the delay is the trans hesitating before shifting down.

Messages Page 1 of 3

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