Reasons for the Muffled Sound When Pressing the Accelerator Hard in Roewe 350
3 Answers
Roewe 350 produces a muffled sound when the accelerator is pressed hard due to engine friction. Below is an introduction to Roewe vehicles: 1. Roewe: The Roewe 350 is a compact sedan positioned in the A-segment market, launched by SAIC Motor following previous models. It is also the first family car from Roewe to incorporate 3G technology. 2. Powertrain: Compared to the older 350 model, the 2014 Roewe 350 underwent technical upgrades in fuel economy. Through the application of new technologies, improvements were made to the chassis, engine, and transmission, reducing fuel consumption to just 6.9L, a 12% decrease from the older 350 model. The 2014 350 transmission added Tiptronic technology, offering four driving modes: D, S, M, and W. 3. Exterior Design: Based on the sporty design of the Roewe N1 concept car, the Roewe 350 features a globalized styling. As the first compact car in the Roewe family, it inherits some design genes from its larger siblings, the 550 and 750.
When my Roewe 350 makes a muffled noise upon deep throttle, I think the first step is to check the exhaust system, such as whether the exhaust pipe or muffler is loose or leaking, as this sound often comes from a low growl in the chassis. Secondly, a clogged intake pipe or air filter in the engine can also cause this muffled noise, as restricted airflow makes the engine work harder. Additionally, insufficient fuel pump pressure or poor fuel line flow can lead to abnormal noise when the throttle is pressed, as the fuel supply can't keep up with the engine speed. Transmission components, such as worn clutch plates, can also cause muffled noises under heavy throttle due to discontinuous power transfer. If this persists for a long time, it may even damage internal engine components. Therefore, I recommend regular maintenance, cleaning the filters, and checking the exhaust and fuel lines to prevent major repairs by addressing issues early.
A muffled sound when heavily accelerating the Roewe 350 is quite common, and my friend's car experienced this issue. After disassembling and inspecting, he found that the exhaust system joint was loose, and tightening it resolved the noise. Additionally, carbon buildup in fuel injectors or a dirty fuel filter in the fuel system can also produce low-pitched noises during acceleration, as this affects the combustion efficiency of the air-fuel mixture. If the intake pipe is aged or cracked, air leaks can cause the engine sound to become muffled. Although rare, engine issues like valve or piston ring problems might produce noises at high speeds. It's recommended for owners to perform simple self-checks: listen to the sound's location, whether it's from the front or rear; if the muffled sound persists, promptly visit a repair shop to use a diagnostic scanner to check the data stream and identify the root cause to avoid unexpected breakdowns.
