What Causes the Loud Engine Roaring Sound When Accelerating in the Outlander?

[RoseLee]

The reasons for the loud engine roaring sound during acceleration include: exhaust pipe leakage, dirty or clogged throttle, and engine misfiring. The specific causes are as follows: 1. Exhaust pipe leakage: When there is a leak in the intake or exhaust pipe, the vehicle's exhaust rate increases during acceleration, resulting in a loud roaring sound. 2. Dirty or clogged throttle: During acceleration, the engine's load increases, requiring the throttle to open wider and more fuel to be injected. If the throttle does not open to the optimal position due to dirt or clogging, it can cause poor air-fuel mixture ratio, leading to noise during acceleration. 3. Engine misfiring: Engine misfiring mainly refers to one or more cylinders not functioning properly, typically manifested as insufficient vehicle power, severe shaking of the exhaust pipe, and a clear "popping" or thumping sound from the engine.