What is the reason for the loud valve noise when the Envision is idling?
1 Answers
The loud valve noise when the Envision is idling is caused by uneven engine operation. Below are the reasons and solutions for the loud valve noise when the Envision is idling: Weather conditions: Cold weather causes the engine idle speed to increase. When the engine remains at a high speed while cold, the engine noise may seem louder. This is a normal phenomenon and there is no need to worry. Almost all vehicles experience higher engine idle speeds in winter. The idle speed will decrease once the engine warms up. Loose plastic parts in the engine compartment: