What causes the rattling noise in Volkswagen 1.4T engine?
1 Answers
Reasons for the rattling noise in Volkswagen 1.4T engine: 1. Cold start noise: Many car owners hear a "rattling" noise from the engine compartment during cold starts. This noise is actually caused by the fuel pump not fully establishing oil pressure during a cold start, resulting in insufficient lubrication for various components. Normally, the rattling noise will disappear after the engine runs for a while. 2. Charcoal canister solenoid valve operation noise: The function of the charcoal canister solenoid valve is to open the solenoid valve between the charcoal canister and the intake manifold after the engine starts, allowing the adsorbed gasoline vapor in the charcoal 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 rattling noise during operation.