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You did not specify the year of your car (always important when asking for help). On the 6 speed there is an interlock to prevent accidental engagement of reverse. Its electrical so a switch / relay / connection failure could result in a immediate non operation situation. Its not a dumb-ass simple system so best to check the service manual test procedure - if you have a 6 speed.Larry B. educated me that the NSX does indeed have a reverse gear synchro. So, it is possible that something may have happened to the synchro (not sure what and synchro issues don't usually happen overnight). On cars that are not equipped with reverse gear synchros, the balk going into reverse is common and the 'tell' is to shift into first, move the car a foot and then see if you can shift into reverse. If that is successful then you might have a tired synchro or other synchro problem. If that doesn't work then you may have a shift fork / shift piece / shift arm issue (too painful to think about that).
You did not specify the year of your car (always important when asking for help). On the 6 speed there is an interlock to prevent accidental engagement of reverse. Its electrical so a switch / relay / connection failure could result in a immediate non operation situation. Its not a dumb-ass simple system so best to check the service manual test procedure - if you have a 6 speed.
Larry B. educated me that the NSX does indeed have a reverse gear synchro. So, it is possible that something may have happened to the synchro (not sure what and synchro issues don't usually happen overnight). On cars that are not equipped with reverse gear synchros, the balk going into reverse is common and the 'tell' is to shift into first, move the car a foot and then see if you can shift into reverse. If that is successful then you might have a tired synchro or other synchro problem. If that doesn't work then you may have a shift fork / shift piece / shift arm issue (too painful to think about that).
