What is the reason for the scooter shaking at start-up but running smoothly?
1 Answers
The reason for the scooter shaking at start-up but running smoothly may be due to spark plug failure, among other issues. Below are specific details about the scooter shaking at start-up but running normally: 1. Specific reasons: When the spark plug malfunctions, it can cause issues with the ignition system or lead to misfiring, resulting in shaking during start-up. Excessive carbon buildup inside the engine can cause the cold-start fuel injector to spray gasoline that is largely absorbed by the carbon deposits, leading to a lean fuel mixture during cold starts and causing shaking at start-up while running normally. Unstable fuel pressure, abnormal fuel pump supply pressure, or incorrect readings from the air pressure sensor can also cause the vehicle to shake during start-up. 2. Solutions: Check the condition of the spark plugs, high-voltage wires, and ignition coils, and inspect whether the spark plugs have excessive carbon buildup. If found, clean or replace the spark plugs immediately. If the shaking is due to carbon buildup, the solution is to clean the fuel system and check the idle motor for carbon deposits. If the shaking is caused by unstable fuel pressure, the solution is to check the fuel pressure and replace any damaged components.
