I am posting this thread to hopefully help someone else if they find themselves in a similar situation.

I took my 91 NSX out for a drive today to enjoy the nice weather and decided to do a quick pay and spray car wash to get the pollen off. After I was done washing my car I got back in and found this on the floorboard:



It looked almost exactly like the brake pedal switch that also broke a few years back but my brake lights weren't on so it wasn't that. I figured I would just check it out when I got home and tried to start the car. The at two clicks the fuel pump came on, main relay clicked, etc but when I tried to start the car I got nothing. It looks like the piece of plastic has something to do with the interlock switch that tells the ignition the clutch is depressed when starting the car.

After a couple of minutes doing the NSX under dash headstand, I found two switches on the clutch. The one closest to the floor mat appeared to be working fine and I couldn't reach up high enough to get to the other switch. Quick search on the phone showed that the top plug was the clutch interlock switch at least for other Honda models (couldn't find any NSX specific info.)

I asked the car wash guy if he had a paperclip I could have and made a jumper.

Game plan:

1) Parking brake on
2) Car in neutral
3) Key already in ignition
4) Pull interlock switch plug and jump with the paperclip while turning the key

The car fired right up and I was able to drive home a very relieved NSX owner

Just about every issue I've had with this car has had to do with old brittle plastic so I wanted to make this post to try and prevent anyone from getting stranded if they have a similar issue.

Also, anyone else ever have this issue? I am trying to decide how hard it would be to repair the switch or just make a permeant bypass.