What happened to the long idle time and loud noise after the cold start of the new carnival? Everything was normal before the first insurance, and this began to happen after the first insurance.

Hello, the idle noise increases after vehicle maintenance. Please check whether the fuel quantity is accurate. It may be that the viscosity of the new oil is smaller than that of the old oil. You can use it for a while to see if the engine sound has changed. There are many reasons for the loud engine noise, so I suggest you go to the 4S shop for on-site test drive to make sure.