What Causes the Mercedes-Benz C260L to Shake During Cold Starts?

[ODerek]

Mercedes-Benz C260L shaking during cold starts can be attributed to the following reasons: Excessive Carbon Buildup on Spark Plugs: One issue during cold starts is low temperatures, especially in cold northern regions. If the spark plug gap is too wide and the ignition energy is insufficient, ignition failure may occur, causing individual cylinders to misfire, leading to weak starts and shaking. Overly Lean Air-Fuel Mixture: Shaking during cold starts could also result from an overly lean or rich air-fuel mixture. This mixture issue might stem from a fault in the closed-loop control system. Since the exhaust pipe temperature hasn't reached the required level during cold starts, the oxygen sensor may not be at its working temperature or could be damaged, resulting in shaking during cold starts. Solutions for Mercedes-Benz C260L Shaking During Cold Starts: Replace Spark Plugs: Inspect the spark plugs for carbon buildup and clean them. Check if the electrode gap meets specifications and replace the spark plugs if necessary. Check the Oxygen Sensor: Inspect the oxygen sensor for damage. Typically, if there is black carbon buildup on the oxygen sensor probe, it may indicate a faulty oxygen sensor.