Ignition & Mounts - Noises & Vibration Symptoms
Common symptoms and diagnostic guides.
Car vibrates at fixed RPM
A car vibrating at a fixed RPM (especially at idle) often points to engine balance, ignition, or mount issues such as worn motor mounts or misfires causing rough idle or resonance.
Car vibrates more than normal at red lights
Car vibration at red lights is often due to engine or mount issues causing rough idle. Common causes include worn spark plugs, vacuum leaks and engine mount deterioration.