[TakeiT]

pawn Код:

forward CountDown(playerid); 
public CountDown(playerid) 
{ 
 CountDownVar--; 
 new str[128]; 
 if(CountDownVar == 0) 
 { 
    KillTimer(CountDownTimer); 
    CountDownVar = 15; 
 } 
 else 
 { 
    GameTextForPlayer(playerid, "Count Down: %d", CountDownTimer, 1000, 1); 
    //format(str, sizeof(str), "Count Down: %d", CountDownTimer); 
    //GameTextForPlayer(str, 1000, 1); 
 } 
 return 1; 
}

pawn Код:

SetTimerEx("CountDown", 1000, true, "i", playerid);

The Playerid isn't defined in yours, your gametext was also set to show for 8 seconds. lemme know if you want all players to see the timer.