What are the reasons for idle vibration in a new Mercedes-Benz C260?
2 Answers
Mercedes-Benz C260 new car idle vibration is caused by a dirty throttle or issues with certain vehicle components. Below are detailed explanations and solutions: 1. Dirty throttle: Solution: Clean the fuel system, throttle, and fuel injectors. When cold, carbon deposits can absorb some fuel, and if the fuel does not completely enter the cylinder for combustion, it can lead to unstable idle and difficulty starting. 2. Slight lateral flipping motion of the engine transmission: Solution: Due to a certain angle between the axial direction of the half-shaft and the inner CV joint, the force point continuously changes along the axial direction during the rotation of the CV joint. Replace the damaged inner CV joint or half-shaft. 3. Ignition system malfunction: Solution: If the ignition system malfunctions, check the spark plugs, cylinder wires, and ignition coils. Typically, leakage in cylinder wires or carbon buildup on spark plugs can cause vibration, which can be resolved by replacement.
When driving my new Mercedes-Benz C260, I sometimes experience idle shaking, feeling slight body vibrations which are quite annoying. This is likely due to an unstable ignition system, where the spark plugs may have shifted during factory transportation, or poor coil contact causing unstable engine RPM. Uneven fuel pump pressure or minor clogging in the injectors can also lead to incomplete combustion, resulting in noticeable shaking. Additionally, if the engine mounts were not properly secured after being jolted during transportation, vibrations can transmit into the cabin. I recommend promptly checking the spark plugs and cleaning the fuel system—since it's under warranty, a visit to the 4S店 for an ECU reset or software update can resolve most issues. Warming up the car for a few minutes before driving may also alleviate minor shaking, but don’t ignore it to avoid engine damage.
