What are the reasons for the loud engine noise in the Tiguan?
2 Answers
The reasons for the loud engine noise in the Tiguan are: 1. Poor spark plug performance; 2. Vacuum tube leakage; 3. High-voltage wire leakage; 4. PCV valve blockage; 5. Throttle position sensor malfunction; 6. Idle stepper motor failure; 7. Idle control valve malfunction; 8. Abnormal throttle opening; 9. Intake system leakage. Taking the 2017 Volkswagen Tiguan as an example, it belongs to the compact SUV category, with body dimensions of: length 4506mm, width 1809mm, height 1685mm, wheelbase of 2684mm, fuel tank capacity of 63L, and curb weight of 1545kg.
I think there could be several common reasons for the loud engine noise in the Tiguan. First is the oil issue – if the oil is old or insufficient, lubrication decreases, increasing friction between mechanical parts, which naturally makes the engine louder. When I drove a similar car before, the engine noise became louder because I forgot to change the oil. Second is wear and tear of engine components, such as old piston rings or bearings, which operate unstably and produce extra noise. Third is an exhaust system leak – loose or cracked tailpipe connections can create noise when exhaust gases escape. Sometimes, it could also be a loose fan belt, making a rattling sound at high speeds. These issues are more noticeable during cold morning starts because metal contracts, increasing gaps. If the noise persists, I recommend getting a comprehensive check at a professional shop to prevent minor issues from turning into major repairs, which could affect safety and fuel consumption.
