Have you checked the tires, tie rods, and/or rotors?

 

upload a video clip to youtube and give a link here.

 

Suggest you read the first post in the VCM megathread at the top of this forum.
I assume you have not yet muzzled your VCM?

That likely your issue.

if VCM has already destroyed your engine mounts, you can muzzle the VCM with an active device and install the much cheaper passive mounts used on the EX and LX (non VCM) models.

 

I suspect it's the VCM, and I ordered the VCM muzzler. It will be here in a few days. I'll report back with the outcome.

 

Update, I installed the VCM muzzler, and it worked as expected, but there was a bump in the road that was not covered in the troubleshooting guide. The ECO came for seconds at a time, so I changed from the blue resistor to the brown, one step higher, per the instructions.

Even though I'm certain I seated the brown resistor correctly, when I started the van, the "VSA disabled" warning came up and the temperature gauge maxed out. The VSA is not related to the temp gauge, so the van's computer was basically freaking out. What must have happened is that the VCM muzzler was causing an open circuit, infinite resistance, due to the brown resistor not connecting correctly.

I just plugged the blue back in, it worked fine (but I had to clear the check engine light myself with an ODB2 device), then gave the brown one another shot, and this time it worked, but I am worried about it flaking out eventually as I'm driving down the highway.

I'm also concerned that the engine might be idling higher than normal because it believes the engine is colder than it really is.

Regarding the actual problem, the bass and vibration, this did not solve that, but it did solve the portion of it that coincided with the ECO mode kicking in. It's still rough at a red light. Based on Google search and ChatGPT, it's possible that when all the engine mounts were replaced, that the 1) mounts they installed are either inferior to the OEM mounts, and/or 2) the alignment between the transmission and motor were disrupted during the repair process, and/or 3) the exhaust pipes are not seated and isolated correctly. I arranged to take it to a transmission specialist, because I think they will have better insight on this issue than the friendly mechanic I'd been going to up to this point.

 

I'm also concerned that the engine might be idling higher than normal because it believes the engine is colder than it really is.

Misguided. These devices have been used for years. Things like this are not an issue. People have put a lot of miles on with one installed.

 

The fact that the ECO light comes on every once in a while, isn't a concern, and will go away as the external temp cools.

I have what you have, and I'm not concerned!

 

Next time call the seller directly, and I'm sure they'll explain everything to you.

 

@A Flanders please do NOT post VCM muzzling questions. If that continues, I’ll close this thread like we close all new muzzling threadsp

Only report out if the bass vibrations were solved or not. For ALL muzzling debates, the sticky is there.

 

What VCMuzzler question are you referring to specifically? Are you saying don't discuss the VCMuzzler in general?

 

The vibration continues with the VCMuzzer installed, but based on another thread, I believe the latest issue is that the shop installed passive mounts in place of the active mounts, which are a lot more expensive. I'm upset that the first auto shop didn't tell me they were replacing an active part with a passive version. I was happy that the repair was cheap, but now I realize why it was so cheap. It was very expensive, but I ordered active mounts and I'm waiting to have them installed.

As an aside, I ordered two VCMuzzlers for my two Odysseys, this one and the one that does not have this issue, but one of them had a short in the wiring, as I mentioned above. I emailed the VCMuzzler company and asked if they could send a replacement, but I have not heard back from them for a week now.

 

I believe the latest issue is that the shop installed passive mounts in place of the active mounts..

If the van was unmuzzled when the passive mounts were installed, then VCM most likely tore them apart. Now that your van is muzzled, replacing them again with passive mounts is fine- provided you're using an active muzzler.

 

okay this thread is about the engine vibration the VCmuzzler might come up in the course of conversation but it is not primarily about that

 

And that is precisely why it’s still open.