How to Solve the Common Vibration Issue in the 8th Generation Accord?

[SanDavid]

Here are the solutions for the common vibration issue in the 8th Generation Accord: 1. Replace all five original engine mounts; 2. Replace the cylinder head. 3. Replace the radiator fan/upper two rubber pads on the radiator. This issue was subject to a recall abroad due to a design defect; replacing them significantly improves the condition. Replace the compressor's refrigerant oil, which requires releasing the refrigerant, adding the new oil first, and then recharging the refrigerant. 4. Install a secondary air intake system. 5. Install an idle stabilizer. Here are the reasons for engine idle vibration: 1. The engine's power primarily comes from the downward movement of the piston, which draws a mixture of gasoline and air into the cylinder. The upward-moving piston then compresses this mixture into a highly combustible gas, which is ignited by the spark plug. The resulting explosion forcefully pushes the piston, generating engine power. The source of this power—the air-fuel mixture—must enter the combustion chamber through the intake valve. 2. A small amount of gasoline tends to adhere to the intake valve. Under the engine's high temperature, the unburned hydrocarbons, paraffin, and gum in the gasoline are burned into carbon deposits. If the fuel injector is dirty, the sprayed gasoline's atomization is poor, leading to uneven mixing of gasoline and air, which increases the amount of gasoline accumulating on the intake valve. These carbon deposits absorb gasoline, which is then burned into more carbon, forming thicker deposits. Thicker deposits absorb even more gasoline, creating a vicious cycle. Eventually, excessive carbon buildup prevents the intake valve from closing tightly, causing the engine to stop functioning.