Does the manual transmission Civic have significant cabin vibration?

[AdamDella]

Significant cabin vibration in manual transmission Civics is an individual case. The main causes of cabin vibration include: Severe engine carbon buildup: The most common cause of car vibration is a dirty throttle body or excessive carbon deposits in fuel injectors. When there's excessive carbon buildup inside the engine, gasoline sprayed by cold-start injectors gets largely absorbed by carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes starting difficult - the engine only starts easily after the carbon deposits become saturated with gasoline. After starting, gasoline adsorbed on carbon deposits gets drawn into the combustion chamber by engine vacuum, making the mixture too rich. This alternation between lean and rich air-fuel mixtures causes idle vibration after cold starts. Lower temperatures require more fuel for cold starts, making carbon deposits more likely to affect successful cold starting. Ignition system issues: Check the condition of spark plugs, high-voltage wires, and ignition coils. Poor ignition system performance or weak spark plug firing can also cause such symptoms. Unstable fuel pressure: If you've already cleaned engine carbon deposits, throttle body, replaced gaskets and spark plugs but still experience idle vibration, we recommend checking fuel supply pressure and intake pressure sensors at a 4S shop. Abnormal fuel pump pressure or faulty intake pressure sensor readings can both cause vehicle vibration.