How to Diagnose and Fix Rough Idle, White Smoke, and Fuel Dripping from the Tail Pipe

by parker
YouTube video


Are you experiencing issues with your car, such as rough idle, white smoke, and fuel dripping from the tailpipe? These symptoms can be indicative of a serious problem with your engine. In this article, we will guide you through the process of diagnosing and fixing these issues. By following the steps outlined below, you can get your vehicle back in top condition and ensure a smooth and efficient driving experience.

Step 1: Identifying the Problem

The first step in diagnosing the issue is to determine the root cause of the problem. In the Youtube video by the channel “In Daily Life Have Fun,” the narrator describes observing white smoke coming out of the muffler and noticing a liquid dripping from the tailpipe. Additionally, the car was experiencing a rough idle and misfiring. These symptoms suggest that there may be a problem with the fuel injector.

Step 2: Inspecting the Spark Plugs

To further investigate the issue, the narrator removes the spark plugs and turns the key to the on position. By looking down into the cylinders, they are able to observe liquid and determine whether it is gasoline. In this case, they found that one spark plug was dry, while another was wet with gasoline. This indicates a potential problem with a fuel injector that is stuck open.

Step 3: Testing the Fuel Injector

Next, the narrator decides to test the fuel injector to determine if it is indeed the cause of the problem. They remove the fuel injector and perform a simple test using a can of WD-40. By attaching the fuel injector to the end of the can, they try to spray it and observe whether any liquid comes out. In a properly functioning fuel injector, no liquid should come out. However, if liquid does spray out, it confirms that the fuel injector is faulty and needs to be replaced.

Step 4: Replacing the Fuel Injector

After confirming that the fuel injector is the issue, it is necessary to replace it. The narrator explains that the fuel injectors are located underneath the intake manifold. Therefore, they need to remove the intake manifold to access and replace the faulty fuel injector. Once the new fuel injector is installed, the engine should be back to optimal performance.


In conclusion, diagnosing and fixing issues such as rough idle, white smoke, and fuel dripping from the tailpipe requires a systematic approach. By following the steps outlined above, you can identify the root cause of the problem and replace the faulty fuel injector. It is crucial to address these issues promptly to avoid further damage to your engine and ensure a safe and efficient driving experience.

Remember to consult a professional mechanic if you are unsure about performing the repairs yourself. They have the expertise and knowledge to guide you through the process and ensure that your car is fixed correctly. By addressing these issues promptly, you can prolong the lifespan of your vehicle and enjoy a smooth and trouble-free driving experience.

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