What Causes Abnormal Noises in the Engine Compartment While Driving?

[SanHaley]

Abnormal noises in the engine compartment while driving can be caused by the following reasons: 1. It may be caused by abnormal noises from the engine valves, pistons, or accessories. 2. It can also be caused by abnormal noises from the transmission or chassis. 3. Loose connecting rod bolts can also cause abnormal noises. Below is some related information: 1. Sometimes, you may encounter abnormal noises from the engine while driving, but when you stop to inspect, the engine continues to run with the noise. In this case, you can loosen the carburetor adjustment needle slightly and then start the engine again for testing. If the noise appears, you can diagnose its characteristics. 2. If there is still no abnormal noise, you can perform a cylinder cut-off test and conduct an emergency acceleration test. This can both make the noise appear and determine the relationship between the noise and the cylinder position.