A combustion engine is supposed to run smoothly from start-up to shut-down. Occasionally an engine will produce noises that are difficult to diagnose. Sometimes, when you hear a strange sound coming from under your hood, you可能不知道该怎么办。A "knocking" sound is the most typical engine noise indicating a mechanical problem that can be fixed if diagnosed correctly and early.
下面指出的是一些事实，说明了引擎敲门的原因以及解决这些问题的能力。
什么是发动机敲门？
敲门引擎（也被描述为刺）可能意味着几个问题之一。有些可能很容易固定，而另一些可能表示重大损坏。当空气燃料混合物不正确时，通常会发生敲击声音，这会导致燃料燃烧在不平衡的口袋而不是均匀的爆裂中。保持未经处理，可能会损坏活塞和气缸墙。敲击声音也可能是由于上缸盖区域缺乏润滑而引起的。这通常是由阀门和举升机产生的滴答声，它们松动或没有收到足够的油。
通常，发动机敲击的最常见原因与发动机有效运行的能力有关。下面指出的是点火系统和与燃料相关的发动机敲击的3个常见原因。
1。Fuel Has a Low Octane Rating
If you put in fuel with an octane rating too low for your vehicle, it can create a knock. An octane rating is the measure of a fuel type’s ability to resist premature detonation of the air-fuel mixture in the engine. The combustion causes the “knocking” or “pinging” sound you hear.
为了防止这种情况的发生，请在制造商建议的情况下使用或更高的辛烷燃料等级使用汽油。可以在汽车零件商店购买的辛烷值助推器可以帮助恢复正确的辛烷值等级并停止敲门。
2.碳沉积限制燃料的有效燃烧
Fuels for vehicles are required to have a carbon cleaning detergent, but they may not prevent carbon deposits from forming. As fuel mixes with oxygen, it is burned. Since gasoline and diesel are made up of multiple carbon molecules, the residual of carbon will form on valves, spark plugs, and other components involved in the combustion process. This reduces the amount of volume inside the cylinder and increases the amount of compression.
In most cases, using a special fuel injector cleaner or additive designed to clean carbon deposits on engine components can resolve this issue.
3.不正确的火花塞或错误的火花塞间隙
如果使用制造商推荐的火花塞除了使用的火花塞，它可能会导致您听到的敲击声音。火花塞具有一定的热量范围，这意味着它会从燃烧室中撤出热量。使用错误的零件可以防止其正常工作。当火花塞间隙未正确设置时，发动机敲门也很常见。
火花塞间隙是火花塞点燃有助于汽车供电的空气燃料混合物的地方。太狭窄的间隙会产生火花太弱而无法执行此任务，而距离太宽可能会阻止火花发射，或者只是迅速失火。
Resolving these types of engine knocking problems is usually rather simple and something most car owners can do themselves. In other instances, it might be prudent tocontact a professional technician正确诊断敲门源并推荐正确的维修。
