Kindly explain the scenario in bit more detail. It will be lot easier to understand.
To me it seems to be a timing issue, timing may be off by one tooth but not the valve issue. Check the timing by opening the timing cover and match the lines and dots on crankshaft and camshaft.
Car engine is still good no smoke no leakage no heatup problem and one valve not wroking. It doesnt make any sense. Who told u that valve is not working and How?