MG 3 parking time is difficult to start at night, with hiss, but it is no problem to stop for a short time. What's the problem?

You said that after starting this morning, MG III would have a hissing sound. This may be because the throttle was turned off all night and suddenly started in the morning. Computer adaptation of engine. Generally, it's not a fault. It can be used normally. Don't worry. It may also be because your battery voltage is relatively low, and the self-charging of the generator will also produce this high speed. The illusion of a sudden sound. The second is that there may be natural faults in the car, but this usually does not happen. The fault is persistent, and it will be normal after the second startup. It shouldn't be a problem. Have a nice trip.