diff --git a/StandardScene.Magnetic/Scheduler/EventCarMission.cs b/StandardScene.Magnetic/Scheduler/EventCarMission.cs
index 451f462..2d92eaf 100644
--- a/StandardScene.Magnetic/Scheduler/EventCarMission.cs
+++ b/StandardScene.Magnetic/Scheduler/EventCarMission.cs
@@ -8,6 +8,7 @@ using SimpleCore.PropType;
 using StandardScene;
 using StandardScene.Scheduler.FassEvent;
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -68,6 +69,9 @@ namespace StandardScene.Scheduler
         /// <summary>记录每辆车上一周期的 CurrentNode，用于 PrevNode 触发与地标变化时清除任务防重复标记。</summary>
         [JsonIgnore] private readonly Dictionary<int, string> _prevNodeByCarId = new Dictionary<int, string>();
 
+        /// <summary>每车最多一个在飞 Tick，避免断网重试把 Task.Run 堆爆、同一车并发下发。</summary>
+        [JsonIgnore] private readonly ConcurrentDictionary<int, byte> _tickInFlight = new ConcurrentDictionary<int, byte>();
+
         /// <summary>进程运行状态扩展字段。</summary>
         public class EventCarMissionStatus : MissionStatus
         {
@@ -140,9 +144,9 @@ namespace StandardScene.Scheduler
             Diagnosis.Post($"FASS EventCar 配置已加载：{path}，事件数={_eventCars.Count}", "FassEventCar", true);
         }
 
-        /// <summary>停止轮询并等待工作线程结束（最多 2 秒）。</summary>
+        /// <summary>停止轮询并等待工作线程结束（最多 2 秒）。覆盖基类 Stop，避免全量重载后线程仍在对全场车下发。</summary>
         [MethodMember(Name = "停止进程", Description = "停止 FASS 车辆事件轮询")]
-        public void Stop()
+        public override void Stop()
         {
             _started = false;
             try
@@ -153,8 +157,10 @@ namespace StandardScene.Scheduler
             {
             }
 
-            status.status = "已停止";
+            _workerThread = null;
             Diagnosis.Post("FASS车辆事件进程已停止", "FassEventCar", true);
+            base.Stop();
+            status.status = "已停止";
         }
 
         /// <summary>
@@ -182,14 +188,18 @@ namespace StandardScene.Scheduler
         }
 
         /// <summary>
-        /// 遍历所有 Car，构建快照并异步调用 Handler（与 FASS Task.Run 行为一致）。
-        /// <para>
-        /// 跳过 status 为空或 usage.refreshing=false 的车辆（未参与调度刷新的车不处理）。
-        /// 当地标变化时清除 <see cref="FassEventCarHandler.ActiveTaskTag"/>，允许在新地标重新触发事件。
-        /// </para>
+        /// 遍历所有 Car，构建快照后 Task.Run 处理：一车断网不堵其它车。
+        /// 同一车上一拍未结束则跳过本拍，禁止无界堆积。
         /// </summary>
         private void ProcessAllCars()
         {
+            var handler = _handler;
+            var eventCars = _eventCars;
+            if (handler == null || eventCars == null)
+            {
+                return;
+            }
+
             foreach (var car in SimpleLib.GetAllCars().OfType<Car>())
             {
                 if (car.status == null)
@@ -207,13 +217,37 @@ namespace StandardScene.Scheduler
                 _prevNodeByCarId.TryGetValue(car.id, out var prevNode);
                 var snapshot = FassEventCarSnapshotFactory.Create(car, prevNode, FassEventCarSnapshotFactory.GetNextNodeCode(car));
 
-                Task.Run(() => _handler.HandleCarTimerTick(car, snapshot, _eventCars));
-
                 if (!string.Equals(prevNode, currentNode, StringComparison.OrdinalIgnoreCase))
                 {
                     _prevNodeByCarId[car.id] = currentNode;
                     ClearTaskTags(car);
                 }
+
+                if (!_tickInFlight.TryAdd(car.id, 0))
+                {
+                    continue;
+                }
+
+                var carId = car.id;
+                Task.Run(() =>
+                {
+                    try
+                    {
+                        if (_started)
+                            handler.HandleCarTimerTick(car, snapshot, eventCars);
+                    }
+                    catch (Exception ex)
+                    {
+                        Diagnosis.Post(
+                            $"FASS车辆事件处理异常 car={carId}：{ExceptionFormatter.FormatEx(ex)}",
+                            "FassEventCar",
+                            true);
+                    }
+                    finally
+                    {
+                        _tickInFlight.TryRemove(carId, out _);
+                    }
+                });
             }
         }
 
diff --git a/StandardScene.Magnetic/Scheduler/FassEvent/FassEventCarHandler.cs b/StandardScene.Magnetic/Scheduler/FassEvent/FassEventCarHandler.cs
index 4786507..fce9010 100644
--- a/StandardScene.Magnetic/Scheduler/FassEvent/FassEventCarHandler.cs
+++ b/StandardScene.Magnetic/Scheduler/FassEvent/FassEventCarHandler.cs
@@ -43,7 +43,7 @@ namespace StandardScene.Scheduler.FassEvent
         }
 
         /// <summary>
-        /// 单次 TimerTick 对一辆车的处理入口（通常在 Task.Run 中调用）。
+        /// 单次 TimerTick 对一辆车的处理入口（由 EventCarMission 按车 Task.Run，同车同时只跑一拍）。
         /// 仅处理 TriggerEvent=TimerTick 的配置项。
         /// </summary>
         public void HandleCarTimerTick(Car car, FassEventCarSnapshot snapshot, IReadOnlyList<FassEventCarConfig> eventCars)