[aircombat]

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
    {
       new vehicleid=GetPlayerVehicleID(playerid);
       SetVehicleParamsEx(vehicleid,0,0,0,0,0,0,0);
       GameTextForPlayer(playerid,"Press 2 to turn engine on",2500,4);
       if(newkeys & KEY_SUBMISSION)
       {
          SetVehicleParamsEx(vehicleid,1,0,0,0,0,0,0);
          SendClientMessage(playerid,BLUE,"The engine is turned on.");
       }
     }
       
    return 1;
}

that should work