Why is the Bora car so noisy?
2 Answers
The Bora is noisy because the EA111 engine is a chain-driven engine, which tends to be louder. There are two fundamental reasons: Excessive engine carbon buildup: This leads to reduced engine power, poor acceleration, acceleration shudder, deceleration shudder, and surging. Inappropriate or dirty engine oil: This causes excessive deposits, clogging the oil filter and some small oil passages, resulting in abnormal noises. Below are the causes and solutions for engine abnormal noises: Loose engine underguard screws: Tighten or adjust the engine underguard screws. Aged engine mounting pads: Replace the mounting pads. Loose plastic parts in the engine compartment: For example, the engine cover, intake pipe, etc. Simply tighten them. Engine belt noise: An aged or improperly tensioned belt (too loose or too tight) can cause noise. Replace or adjust the tension. Engine knocking: Excessive internal carbon buildup or use of substandard fuel. Clean the carbon deposits and replace the fuel.
My old Bora has been running for six years, and recently the noise on the highway has been especially loud, sounding like a tractor. After a thorough inspection, I found out the issues are with the aging engine mount bushings and loose exhaust system joints. The mechanic mentioned that German cars tend to have particularly noticeable low-frequency resonance noises when their rubber components age, especially around 1500 RPM during acceleration, causing a headache-inducing hum. Additionally, there’s slight play in the rear wheel bearings—at low speeds, it’s a rustling sound, but at high speeds, it turns into a roaring noise. It’s recommended to focus on checking these four areas: engine mounts, exhaust pipe hangers, wheel hub bearings, and tire wear patterns.
