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What causes the abnormal noise when starting a Mercedes-Benz E200?

1 Answers

DawsonLynn

07/30/25 3:44am

Mercedes-Benz E200 startup abnormal noise may be caused by cold start noise or carbon canister solenoid valve operation noise. Below are detailed explanations of the causes and corresponding solutions: Cold start noise: Many people hear a "clicking" abnormal noise from the engine compartment during cold starts. In fact, this "clicking" noise occurs because the oil pump hasn't fully established oil pressure during cold start, resulting in insufficient lubrication for various components. Solution: Normally, this clicking noise will disappear after the engine runs for a while. Carbon canister solenoid valve operation noise: The function of the carbon canister solenoid valve is to open the electromagnetic valve between the carbon canister and the intake manifold after the engine starts, allowing the adsorbed gasoline vapor in the carbon canister to enter the cylinder along with air for combustion. This not only reduces emissions but also lowers fuel consumption. This component may also produce a clicking sound during operation. Solution: This is a normal working phenomenon and requires no treatment.

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