What is the reason why Nissan Qi Jun hot car shakes cold car normally?

The main reason for the start-up jitter of hot cars is that the accelerator has more carbon deposits, or the oil is not well matched at the start.

1, the carbon deposit on the throttle prevents air from entering according to the throttle opening, which leads to the imbalance of air-fuel ratio, so the phenomenon of jitter occurs. It should be noted that when cleaning the throttle, you can't just clean the throttle. The throttle idle valve must be disassembled and cleaned, and the bearing of the idle valve must be lubricated.

2. For manual transmission models, the cause of starting jitter may also be caused by poor oil separation and cooperation. The engine speed is not synchronized with the clutch plate speed, which may lead to the impact when lifting the clutch. After shifting into a new gear, when the clutch rises to semi-linkage, as long as the engine speed is equal to or slightly higher than the clutch plate speed, it can effectively prevent the reverse; Another situation is that there is something wrong with the clutch assembly of the car and it needs to be replaced in time.