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Discussion Starter #1
hello,
My sienna developed this thump sound in the last couple of months when switching gears happens 90% of the time now. 2011 LE v6 2wd 114k miles. Only happens when engaging R or D, sometimes when im cruising with my foot of the gas and then give it some gas it'll do the clunk but not as loud as when switching gears from a standstill. I've put brand new original toyota motor mounts thinking it was that but obviously it wasn't. My mechanic checked the axle and apparently everything is fine. I don't know what it could be or if it is transmission related. Thanks in advance!
Here's a link to the sound. The first thump or the loud sounds is me actually switching gears the lower sounding thump or clunk is the sound the car makes after engaging reverse or drive.
 

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hello,
My sienna developed this thump sound in the last couple of months when switching gears happens 90% of the time now. 2011 LE v6 2wd 114k miles. Only happens when engaging R or D, sometimes when im cruising with my foot of the gas and then give it some gas it'll do the clunk but not as loud as when switching gears from a standstill. I've put brand new original toyota motor mounts thinking it was that but obviously it wasn't. My mechanic checked the axle and apparently everything is fine. I don't know what it could be or if it is transmission related. Thanks in advance!
Here's a link to the sound. The first thump or the loud sounds is me actually switching gears the lower sounding thump or clunk is the sound the car makes after engaging reverse or drive.
That is a symptom of bad engine mount(s). My former Odyssey would make a clunk noise when changing from reverse (R) to drive (D). Did you replace all engine mounts? Did the mechanic bill you and did not actually replace the mounts? That is a serious accusation, but it can happen. Or the new engine mounts are defective.



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Most of the people i talk to say engine mounts. I checked the mounts and they are all the new ones. One being defective could be possible. He did install them though. I'm going to take it to another mechanic just to make sure. The The transmission runs switches gear smoothly when driven normally so It might be something wrong with one of the mounts maybe they were installed incorrectly? thanks!
 

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Most of the people i talk to say engine mounts. I checked the mounts and they are all the new ones. One being defective could be possible. He did install them though. I'm going to take it to another mechanic just to make sure. The The transmission runs switches gear smoothly when driven normally so It might be something wrong with one of the mounts maybe they were installed incorrectly? thanks!
A good mechanic can determine bad engine immediately. When I took my Odyssey to replace the engine mounts, the independent Honda/Acura specialists verified before beginning work. The lead mechanic observed the engine mount one at time while another mechanic revved up the engine.

Maybe wrong engine mounts? Isn't your model year has a 4 cylinders engine too?

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Discussion Starter #5
I did order them from mcgeorge Toyota with my vin #. But it can happen for sure. I'm going to try another mechanic, or maybe take it to Toyota see what they diagnose.
 

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No, all catback exhaust systems on vehicles hang off the undercarriage with a "hook" and rubber bushing. I've experienced issues like this before where sometimes the exhaust moves enough to clunk/bang on something nearby when you have a bad bushing.
 

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Check the drive shafts. I had the exact same noise in my old Ody, and it turns out one of the drive shafts was bad.
 

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No, all catback exhaust systems on vehicles hang off the undercarriage with a "hook" and rubber bushing. I've experienced issues like this before where sometimes the exhaust moves enough to clunk/bang on something nearby when you have a bad bushing.
Ok gotcha. Sounds worth a look . I'll check tomorrow, i'll keep y'all posted.
 

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Discussion Starter #11
So, i took it to another mechanic. He checked it out says its a bad axle. Driver side. What do you guys think?
 

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So supposedly my mechanic tightened some bolt on the CV axle driver side and now it does not clunk in drive, only in R. He said for sure it has to be the CV axle . I bought both sides so we'll see when they get here and he installs them. Driving it home I did notice that it doesn't clunk in drive anymore and the clunk in R is more subtle. Hopefully thats the culprit. I'll keep you guys posted.
 

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Discussion Starter #13
Check the drive shafts. I had the exact same noise in my old Ody, and it turns out one of the drive shafts was bad.
Thanks, That's what it's looking like so far. Hopefully it's just that. I'm dreading it being some transmission issue.
 

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Most likely the drive axles. I was fearing the worse with my Ody as well, given Honda’s horrible reputation on transmissions. But it was the axle. Hopefully yours will just be the axles as well.
 

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it could also be a combo. cv axle / tire height and wear/ wheel balance and your motor mounts. i think you started in the right place and there is some compensatory wear in others
good luck
 

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Discussion Starter #16
it could also be a combo. cv axle / tire height and wear/ wheel balance and your motor mounts. i think you started in the right place and there is some compensatory wear in others
good luck
Thanks, the tires were brand new when i bought the sienna. yeah i started with the mounts because they were shot and were my first guess. Well see how it goes after the axles. The reason i bought a sienna was reliability so hopefully this is all that's wrong with it.
 

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I'm having the same clunking problem. Is it possible to have your mechanic take pictures of the defective axles Or save the old axles for you to take pictures? I'm curious to see what it looks like.
 

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Discussion Starter #18
I'm having the same clunking problem. Is it possible to have your mechanic take pictures of the defective axles Or save the old axles for you to take pictures? I'm curious to see what it looks like.
Yeah I'll try to save them and I'll post the pics.
 
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