关闭钥匙时，您希望汽车停止！当不这样做时可能会非常沮丧。如果发动机继续像将其关闭一样继续运行 - 好像您根本没有将其关闭，那么您的点火和燃油系统就不会关闭。在这种情况下，您的汽车有一个需要解决的电气问题。您的点火开关元件或电源继电器都需要更换。但是，如果发动机无法停止，但似乎伴随着敲击和ping声的跳动，那么您所经历的东西被称为“柴油”。
当发动机燃烧室中有一些足够热以点亮任何进入发动机的残留燃料时，就会发生柴油。之所以称为柴油机，是因为柴油发动机以相同的方式点燃燃料，而无需使用电动火花塞。这通常不是现代燃油汽车的问题，而是用来困扰着化油器黑暗时代的汽车驾驶员。
如果你的车has a problem with dieseling。There a few steps you can take that may help you figure out what is going on. It’s possible you can deal with the problem with a few minor adjustments.
Part 1 of 3: Determining if you have an electrical or a dieseling problem
Materials Needed
- Screwdrivers (Phillips and straight)
- Workshop manual
Step 1: Determine whether you have an electrical or a dieseling problem。当您关闭钥匙时，似乎您根本没有将其关闭吗？仪器和配件和转向信号仍然有效吗？
Does the engine run smoothly as though you could just put it in gear and dive away? If so, you are experiencing an electrical problem.
However, if the engine goes into fits of knocking and pinging, continuing to turn but not shutting completely off; then go ahead and look at Part 2.
Remove the bottom half of the plastic shroud surrounding the steering column. Locate the electrical connector to the ignition switch. It may be on the back of the ignition switch itself, or it might be at the end of an electrical pigtail from the switch and be located further down the steering column.
Unplug the switch at the connector and everything should immediately go dead. If this is the case, solving this problem will require replacing theignition switch element。
Step 2: Check for a power relay。如果您的发动机在断开点火开关后继续正确运行，则需要找到燃油和点火系统的主要继电器。您的研讨会手册应该能够帮助您找到它。
在某些汽车中，继电器可以称为ECM继电器，Digifant或DME继电器。虽然非常罕见，但汽车可以继续被粘附的主要继电器供电。如果在接电后终于在电动供电，replace the relay。
第3部分的第3部分：诊断柴油机
Materials Needed
- Distributor wrench (appropriate for your car)
- Safety glasses
- Screwdrivers
- Spark plug wrench (appropriate for your car)
- 转速表
- Timing light
- Workshop manual
Step 1: Carburetor, or fuel injected? Does your car have fuel injection or does it have a carburetor? If you don’t already know, check your workshop manual.
如果你的车was made after 1985 it probably has fuel injection. Dieseling is rarely a problem with fuel injection because the fuel delivery is shut down as soon as the switch is off. Unless it is specially equipped, a carburetor will deliver fuel as long as there is air passing through it.
If you have a fuel injected car that is dieseling, there is a必须更换的系统中泄漏的燃油喷油器。
步骤2：检查空闲速度。If the engine idle speed is too high, it may cause the car to diesel after it is shut off.
Hook up yourtachometeraccording to instructions and check the idle speed. Most four and six cylinder engines should idle around 850 to 900 RPM. Eight cylinder engines may idle around 600. Check your workshop manual and adjust the idle speed according to the specifications.
Step 3: Check the anti dieseling solenoid。在1970年代后期，随着排放控制的增加，柴油机甚至在新车上开始成为一个问题。因此，制造商向其化油器添加了电闭合阀，并将其称为抗柴油电磁阀。
It’s usually cylindrical, about 1-2 inches long and has a single wire connected to it. That wire is hot when the key is on and opens the valve, allowing it to close when the key is off.
断开电线并打开钥匙。一起触摸连接器并释放它们。您应该在打开并关闭时听到螺线管咔嗒声。如果没有声音，则螺线管将不起作用，需要更换。
Step 4: Check the ignition timing。现代汽车没有可调节的点火时间，但是如果您的汽车足够大，可以遇到柴油问题，那么它可能具有可调的时机。
如果点火正时停止了几个程度，则可能导致发动机内部的温度升高，从而导致导致柴油的条件。
检查研讨会手册中的计时过程。它可能因汽车而异。有些汽车将定时设置为空闲，另一些汽车将其设置为高发动机速度。一些制造商希望您在设置时机之前断开某些控件。没有一个程序适用于所有发动机。
- Warning: Be very careful! You will be working close to rotating engine parts.
Shine the timing light on the timing marks while the engine is running at the specified speed and verify that the marks line up as they should. If adjustment is necessary, that is done by loosening the distributor with the distributor wrench and turning the distributor slightly in one direction or the other depending on which way you want to move the timing.
步骤5：检查火花塞。Using an incorrect spark plug can also cause dieseling. Spark plugs are designed to maintain a specific operating temperature, and if the plugs installed in your engine are the wrong heat range, they may cause a hotspot that can lead to dieseling.
Take out a spark plugand compare the part number to the manufacturer’s specifications.更换它们if you find anything wrong.
第3部分的第3部分：应对碳
Materials Needed
- Engine cleaning fuel additive
- Premium gas
Step 1: Try a fuel additive。如果您经历了所有这些步骤并且没有解决问题，那么发动机可能会严重积累碳。
Carbon buildup can raise compression in the engine and can cause hot spots in the combustion chamber that can lead to dieseling. There are a number of fuel additives on the market that are intended to help clean the carbon out of an engine while it is running.
Following the manufacturer’s instructions, put a can of fuel additive into the tank when you fill it up. Then take the car out on the highway and drive at speed for a while, also doing some hard accelerations. The cleaning formula may help to break up carbon deposits and send them down the tailpipe.
- Tip: At some point while discussing your problem, you will probably encounter some old guy who will tell you to try pouring a cup of water down the carburetor while the engine is running. Thank him politely, but don’t follow the advice. It’s a good way to wreck your engine.
Step 2: Change your fuel。使用较高的辛烷燃料可能有助于减轻您无法通过其他方式来补救的柴油问题。这是一种治疗方法，而不是治愈方法。较高的辛烷值更稳定，不容易发生发动机中的碳堆积。
Eventually, you may grow weary of the extra expense of filling your car up with premium. Or using premium may solve your problem at first but will grow less and less effective as time goes by. The ultimate solution to your dieseling problem may involve some major engine repair. Contacting a mobile mechanic, such as one from YourMechanic, to come to your home or office toinspect your car帮助您弄清楚下一步要做什么是简单方便的。
