What Causes Vehicle Body Vibration at Speeds of 80 to 100?

[DelJake]

Vehicle body vibration at speeds of 80 to 100 is often caused by severe engine carbon deposits or similar issues. Severe Engine Carbon Deposits: Severe engine carbon deposits are one of the most common reasons for vehicle vibration, typically due to excessive carbon buildup in the fuel injectors or a dirty throttle body. Excessive carbon deposits inside the engine can absorb the gasoline sprayed during cold starts, leading to an overly lean air-fuel mixture and difficulty starting. Users should clean the fuel system and check the idle control valve for carbon buildup, which should be cleaned if necessary. Ignition System Issues: Ignition system problems can also cause such symptoms. It is advisable to inspect the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or improper spark plug firing can lead to these issues. Check if the spark plugs are excessively carbon-fouled and replace them if necessary.