Last post on Oct 27, 2012 at 8:40 PM
You are in the Toyota Sienna
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Toyota Sienna, Van
#53 of 60 2007 Sienna Engine Knocking Issue
Jan 21, 2009 (9:21 pm)
Since the day I bought my 2007 Sienna in May 2007 I have noticed a knocking noise when the accelerator is pressed. The noise continues until the engine reaches 2,000 RPMs. The noise also stops after the engine is warmed-up.
The sales person who sold me the vehicle stated that all the 2007 Sienna's make the same noise. A mechanic I know; who owns a 2006 Sienna, stated that it sounds like one of the "lifters is sticking." If I accelerate too quickly, the vehicle almost sounds like a diesel (until I get over 2K RPMs). Not sure if this issue has been addressed in the past (on this board), any feedback is appreciated.
#54 of 60 New transmission on 2009 Sienna
Jan 29, 2009 (9:07 am)
Since the early miles, we noticed hesitation when switching gears. There was evident delay when switching. This got worse and worse and by 600 miles, the car would not go in 'D'. Had to manually switch to 2 and 3 to get it going. Dealer got us a 'new remanufactured' transmission It's running very well now.
#55 of 60 Re: 2007 Sienna Engine Knocking Issue [nw_in_x]
Feb 03, 2009 (1:00 pm)
My engine doesn't sound like that at all.
It is a chain-driven camshaft so there may be more noise than the old belt-driven cams on the 3.3l, but definitely no knocking.
My trans hesitates a little bit, our 2009 Forester's 4EAT is much more responsive.
#56 of 60 Re: 2007 Sienna Engine Knocking Issue [nw_in_x]
May 12, 2009 (12:04 pm)
Mine does the exact same thing. However it only does it when it is cold outside and only for 5 minutes at the most. I had the Toyota dealer look at it and the mechanic said that they all did that and that there was nothing wrong with it. The van had about 30k miles on it when I took it in.
#57 of 60 2007 Sienna problems
Jul 27, 2011 (6:52 pm)
I also have a 2007 Sienna. I started hearing a noise every time I took my foot off the gas and then about 7 months ago I went to reverse and it didn't want to reverse for me and then struggled in drive. It freaked me out and I immediately took it to my dealership. The serviceman I took it to experienced the same thing and then when they went to diagnose it, it wouldn't do it anymore. They had my car for two days and said they couldn't find the problem. About a month ago it happened again and again I took it to my dealership and again they said they couldn't find the problem. Now my car won't stay in park unless I have the e brake on. I'm so frustrated! I think its been the transmission the whole time and they never did anything about it! I also had to have the 02 sensor replaced a year after I bought it and the drive shaft also needed to be replaced. I think I was sold a lemon and I'm really upset.
#58 of 60 Re: 2007 Sienna problems [ehuds]
Oct 22, 2012 (1:27 pm)
I have had the same problem with my 2007 Sienna yet Toyota says there is nothing wrong with the van and that is how it runs.
I have had the van since new. I know when there is something not working right. The van slows down quicker than it used to and makes a faint grinding/rubbing sound when I remove my foot from the accelerator until it hits about 20mph and then it seems to stop making the noise and coast normally.
I used to take my foot off of the accelerator when coasting down a hill as I would always end up picking up speed. Now the van slows down when going down a hill as if I'm pulling an anchor.
Today when I got home and put it in park the van started to roll down my driveway.
Nothing wrong with Toyota????
#59 of 60 No Transmission Flush !!!!
Oct 27, 2012 (7:39 pm)
We are the original owners of a 2008 Sienna Limited. The vehicle has 130,000 miles without a single problem. I just took the vehicle to the dealer for a transmission flush and he told me not to have it done. I've never heard of such a thing! They said the trans would go over 200.000 easily and if I've never had it done it could cause more damage by having the work performed. Has anybody else been told this. Thanks
#60 of 60 Re: No Transmission Flush !!!! [rumandcoke]
Oct 27, 2012 (8:40 pm)
Your service manager is correct. Toyota only recommends a true flush as a way of cleansing the system of shrapnel in the event that your transmission self destructs and contaminates the lines and the cooler in the radiator.
Link to the TSB on my cloud site:
Recommended service is the "4 quarts at a time method".