Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

The owner wanted me to check the vertical vibration on the steering wheel while the engine was running.
Normally, you will get sideway movement if you damaged the crushable structure of V-shaped plastic/metal holders at the steering column but not the vertical movement.

So, removed the lower panel and torque checked the column U-sahped holder bolts as well as the crushable structure nuts.
Nothing wrong with them so looked at the universal joint but again, nothing loose.

I noticed that while at idle rpm, there is no noticeable vibration on the steering wheel but during the fast idle state at about 1,800-2,000rpm, the steering column is rigid and only the wheel does vibrate.

I already changed my steering wheel to NSX-R one and being as non-LEV model, I can't simulate the air pump operation stage or direct comparison of the vibration at the steering wheel but I think it is something to do with the weight of the wheel itself.

SRS wheel is really heavy....





Although I couldn't re-create the noise issue from the left door panel that the owner reported, decided to take a look at behind the door card.
As seen on many NSX, the screw fixing tab was damaged. Stop tightening it once you start feeling any resistance.
Otherwise, you will end up in this situation. Probably the same on your NSX especially if you have Honda UK dealer installed security devices or aftermarket ICE.






Used my fingers, mirror but couldn't find anything in the door panel.
The connectors, wiring, etc were also still secured so didn't look like the noise was coming from the door.
There is vent flap at the top and near the power window switch that could make some noise on older cars but with the age of this NSX, very unlikely and in fact, the flaps were not rattling.




The noise could be from behind the centre console, the interior trim next to the fuse box lid (1st photo), the square box like cover at the side sill (2nd photo), the sill plate at the door opening, behind the glove box, etc.

Looked as if someone already did something at the side sill trim in the 2nd photo......

As I couldn't re-create the noise, stopped here.





By the way, whenever you have a chance to remove the door card, make sure to protect the non-WPC connectors
behind there.
For some reason, Honda didn't use WPC spec in the door panel that sooner or later, your lock/unlock switch, etc will start behaving erratically.