[InglewoodRoleplay]

Here you go, you just have to check the value of the engine parameter and do an else statement.

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[]) {
    if(strcmp(cmdtext, "/engine", true) == 0) {
        new vehicle = GetPlayerVehicleID(playerid);
        new engine,lights,alarm,doors,bonnet,boot,objective;
        GetVehicleParamsEx(vehicle,engine,lights,alarm,doors,bonnet,boot,objective);
        if(!IsPlayerInAnyVehicle(playerid)) return SendClientMessage(playerid, COLOR_RED,"{FF6A22}INFO: {FFFFFF}You need to be in vehicle to start engine.");
        if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER) return SendClientMessage(playerid, COLOR_RED,"{FF6A22}INFO: {FFFFFF}You need to be driver to use this command.");
        SendClientMessage(playerid, COLOR_PURPLE,"{00FF00}INFO: {FFFFFF}You twist the key, and wait 4 seconds.");
        //if(Eng[playerid] == 1) return SendClientMessage(playerid, COLOR_RED,"{FF6A22}INFO: {FFFFFF}You already turned engine on.");
        SetTimerEx("EngStart", 4000, false, "d", playerid);
        if(engine == 1) {
            SetVehicleParamsEx(vehicle,0,lights,alarm,doors,bonnet,boot,objective);
            SendClientMessage(playerid, COLOR_PURPLE,"{00FF00}INFO: {FFFFFF}Engine turned off.");
            return 1;
        } else {
            //It's turned off, turn it on
            SetVehicleParamsEx(vehicle,1,lights,alarm,doors,bonnet,boot,objective);
            SendClientMessage(playerid, COLOR_PURPLE,"{00FF00}INFO: {FFFFFF}Engine turned on.");
            return 1;
        }
        return 1;
    }
}