Solution for the vibration on 2015 Sienna at 1250RPM - Toyota Sienna Forum - siennachat.com
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post #1 of 14 (permalink) Old 02-18-2016, 10:30 PM Thread Starter
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Smile Solution for the vibration on 2015 Sienna at 1250RPM

There is a vibration on 2015 Sienna when engine speed at around 1250 RPM. Some vehicles are very minor, and others could be very severe. The vibration on my 2015 Sienna sometimes was very severe and along with the lower frequency drone noise. This had made me feeling very headache and ears pain. Had brought it to the dealer several times for a inspection. Nothing found! Had test another brand new 2015 Sienna SE, did the same thing, just a little better than mine. The last time I went to the dealer, they did something on the CAT converter. Before, there were four lock washer on the 4 bolts (with spring on it) those connects the CAT converter to the front and rear manifold pipe. The service tech removed those lock washers and tightened the four bolts. Because they believed that the vibration was caused by the looseness of those joins. But after I picked up my Sienna , I found the vibration was worse than before. Then I was thinking if I made it a little looser, would it be a little better?? So what I did is put 2 flat washer and 1 lock washer on each bolt. After I tightened those bolts, the spring on it will only be compressed 1 to 2 turns. I test drove my Sienna after doing this. The vibration almost went away. There is only minor vibration when cold start the car. Those drone noise also is not noticeable. If you are experiencing the vibration on your Sienna. You may try this on your car(you can put more or less washers on your bolts, just remember do not make the spring too tight, so the washer amount may vary on different vehicle). Please see the following pic for the washer size and position of CAT converter.
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Last edited by bruce2016; 02-19-2016 at 04:50 PM.
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post #2 of 14 (permalink) Old 03-01-2016, 10:47 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Had the same problem as you , took to dealer and they also tightened spring tension that made the problem much worse and i mean so bad that you could feel it in the steering wheel. SO i also did the same as you and problem is MUCH better but still not completely gone, hoping toyota will address this with a TSB fix, if not i am sure they will loooose future toyota sales as this is most prevalent on many sienna vans.
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post #3 of 14 (permalink) Old 03-03-2016, 07:30 PM Thread Starter
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Absolutely, I do not think it is a very difficult project for Toyota to do some improvement on the Sienna. I believe they must be aware of this issue for several years.
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post #4 of 14 (permalink) Old 08-25-2016, 02:09 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Bruce2016

Did you do this modification to both joints since you have pictures of both joints?
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post #5 of 14 (permalink) Old 08-25-2016, 12:03 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

I drove 2 brand new '16's; no vibrations.
There must be a retrofit fix (tech bulletin) for this if they've addressed it at the production level.

'16 Sienna LE in silver sky metallic



"If it ain't broke, try to fix it anyways"
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post #6 of 14 (permalink) Old 08-26-2016, 11:39 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

My 2016 LE has a similar drone. Around 1200 rpm. Not terrible, but obvious. Thinking about playing around with the exhaust system. I will keep you posted.
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post #7 of 14 (permalink) Old 01-12-2017, 09:53 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Hi all. Just bought a used 2016 LE and it drones at 1250RPM as well. It has 24000 km. Not impressed. Interested to know if the fix from the first post is still working and if anyone else has had success with it. Toyota mechanic said reprogramming the ECM would do the trick.
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post #8 of 14 (permalink) Old 01-13-2017, 10:08 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

You need to be aware of the possibility of carbon monoxide leakage with this type of modification.

The purpose of the spring bolt is to keep a constant compression on a tapered/doughnut shaped gasket placed between two flanges. The spring bolt allows some system flexing as the engine rocks on it's motor mounts, and limits the total motion and vibration transmission to the exhaust system. But as it rocks, it wears down the gasket and the spring bolt tensioner takes up the slack and maintains compression and the seal. By placing washers / lock washers between the flanges, you've limited how much those flanges can come together as the gasket wears. Eventually that gasket will wear away an edge, and exhaust leakage will begin.

If you decide to do this, you must get under there and inspect it regularly with the engine running for signs of increased noise or puffs of air escaping.
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Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #9 of 14 (permalink) Old 01-14-2017, 12:15 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Hmmm. Any suggestions on how to fix this issue without creating another problem in the process?
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post #10 of 14 (permalink) Old 01-14-2017, 02:07 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

This is an interesting topic, as I posted a question about whether 2017 Sienna's share the drone problem with the Lexus 2016rx350, since they share the same engine transmission. It looks like the issue is widespread.
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post #11 of 14 (permalink) Old 01-14-2017, 10:20 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

I looked under my van this evening, and as suspected there should be NOTHING between the flanges. The spring should be 'clamping' the two sides together, yet be allowing the needed motion as the drivetrain rocks. The OP has created a pretty much solid system, and that puts a lot of stress on the joint to the transverse mounted muffler. Eventually either the cat flanges will leak, or the muffler connection will fail. I wouldn't do this. There must be better way to quell the resonance.

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
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post #12 of 14 (permalink) Old 01-15-2017, 11:37 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Doing some research and found that the new gen Highlander is having the same issue. DIY fix seems to be removing the exhaust bracket at the oil pan ... another guy had the dealer replace the exhaust manifold with an updated part. Apparently they redesigned the manifold due to the complaints coming from their customers. No TSB yet of course.

Wonder if the Sienna and Highlander share an exhaust system and therefore have the same sort of issues.
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post #13 of 14 (permalink) Old 01-16-2017, 12:32 AM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

Apparently Toyota is having a problem with exhaust drone across many Lexus and Toyota models. Not sure if they are giving it much priority since it has been going on for several years now. Also, the new 2017 Highlander with the Lexus powertrain (8 speed transmission and 3.5 engine) has the drone at around 1700 to 1800 rpms. Be glad the Sienna's drone is at 1200 rpms because the 1700 to 1800 rpm drone in the Highlander is the sweet spot that the vehicle want to be at during highway driving. It would truely suck if the Sienna's drone problem occurred at highway speeds (around 2000 rpm). One solution that some Lexus owners had tried was to add dampers to the exhaust system. Some have reported that this solution helped but did not completely eliminate the problem.
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post #14 of 14 (permalink) Old 02-06-2017, 10:03 PM
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Re: Solution for the vibration on 2015 Sienna at 1250RPM

It's gone!

I removed the exhaust bracket (at the oil pan) and the droning is gone.

Seems the bracket is the issue.

I've read that others have placed a high temp ceramic gasket (from a tail pipe repair kit) between the clamp and the pipe with some success. Might try this later, but for now, I'm pretty happy with the results.

http://www.toyotanation.com/forum/33...-worse-38.html
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