What Causes the Engagement Impact Noise When Starting with a Dual-Clutch Transmission?
3 Answers
It is normal for a dual-clutch transmission to produce metallic impact sounds under certain conditions. The following details the reasons for abnormal noises during the start-up of a dual-clutch transmission: Gear Shift Fork Noise: During the gear shifting process of a dual-clutch transmission, the final gear selection is completed by the shift fork, which can easily generate abnormal noises when operating. Additionally, the clutch assembly may also produce noises during the shifting process. Many car brands experience this phenomenon: Currently, many domestic brands using dual-clutch transmissions also encounter varying degrees of abnormal noises, although significant improvements have been made.
I've been driving dual-clutch cars for over a decade. The impact noise during initial acceleration could stem from various causes, such as severe wear of clutch plates leading to rough engagement, or contaminated/low transmission fluid affecting lubrication. Dual-clutch transmissions rely on two alternating clutches for rapid gear shifts, and improper synchronization often generates abnormal noises, especially during frequent starts in urban traffic congestion. I once encountered a similar issue caused by aging hydraulic system seals leaking oil pressure. It was resolved only after replacing the fluid and components at a professional shop. Regular transmission fluid maintenance is crucial – change it every two years or approximately 50,000 km. If the noise worsens with jerking sensations, never ignore it as this may accelerate clutch damage or even total transmission failure. Early diagnosis via scanner or professional inspection is wise, since safe driving comes first.
When driving a dual-clutch transmission car in daily use, I've noticed that collision sounds during startup are quite common, mostly caused by slight wear when the clutch engages, resulting in minor abnormal noises. This might be normal during the break-in period of a new car, but persistent occurrences should raise concerns. From my experience, first check if the transmission oil is deteriorated or insufficient, as dirty oil can clog hydraulic lines, leading to rough engagement. If not addressed promptly, the noise might escalate into loud clunking sounds, affecting smooth starts or even causing sluggish acceleration. Once, my car had this issue, and after being towed to the dealership for diagnosis, replacing a small part fixed it at a low cost. Try to start gently and avoid sudden acceleration to reduce clutch pressure. Remember, prolonged driving in humid or dusty environments increases the risk of such issues, so checking the oil level quarterly is a good habit.
