What are the reasons for engine shaking in Mercedes-Benz C260?
4 Answers
Reasons for engine shaking in Mercedes-Benz C260: 1. Carbon deposits require cleaning of the fuel system, throttle body, and fuel injectors to resolve. 2. Ignition system failure requires checking spark plugs, cylinder wires, and ignition coils. Typically, cylinder wire leakage or spark plug carbon deposits can cause shaking, which can be resolved by replacement. 3. Damaged engine mounts can easily cause resonance, shaking, and bouncing. Below are precautions for engine maintenance: 1. Always use engine oil of the appropriate quality grade and suitable viscosity. Ensure all used oil is completely drained during oil changes. 2. Closely monitor when temporarily using substitute oil products. 3. Maintain good crankcase ventilation. 4. Regularly change the engine oil.
Last time I drove my friend's C260, I encountered the same issue—shaking like it was gasping for breath. The most common culprit is worn-out spark plugs, which need replacement every 20,000 to 30,000 kilometers. When they age, the ignition becomes intermittent. Then there's the ignition coil—if one cylinder fails, it immediately goes on strike, and you can literally see the tachometer needle dancing. Also, since Mercedes introduced the 48V mild hybrid system, if that small electric motor acts up, the engine starts shaking too. Finally, check the engine mounts—if the rubber deteriorates, it’s like having failed shock absorbers, and you’ll feel the engine vibrations directly in the cabin. For such precision mechanical issues, it’s best to visit a dealership to read the fault codes—don’t try to DIY this one.
When repairing cars, I noticed that German cars tend to shake. Here are a few key points: First, the fuel system—clogged fuel injectors can cause incomplete combustion in a cylinder, and insufficient fuel pump pressure disrupts the overall fuel supply rhythm. Second, carbon buildup—a dirty throttle body leads to unstable air intake, making it feel like the engine is gasping for air. Third, sensor issues—for example, an inaccurate mass airflow sensor can cause the ECU to miscalculate the fuel injection, confusing the engine. Also, check the vacuum hoses—if there's a leak, the idle speed will fluctuate wildly. The best way to diagnose these issues is by using a scanner to check the data stream. You can also try adding a bottle of fuel additive and driving on the highway, as it might help alleviate the problem.
From a physical perspective, vibration is essentially caused by unbalanced work output. Excessive spark plug gap or electrode erosion can lead to misfires, and internal cracks in ignition coils causing high-voltage leakage are also common occurrences. Sticking fuel injectors or poor atomization result in fluctuating mixture concentrations, disrupting piston movement rhythm. Distorted signals from the crankshaft position sensor can cause ignition timing errors, akin to a conductor missing the beat. The most elusive issue lies in wiring harness problems, where high temperatures in Mercedes-Benz engine bays often lead to loose connector contacts. It's recommended to first measure cylinder pressure to rule out mechanical faults, then inspect the electrical and fuel systems.
