Why does the Volkswagen Sagitar make abnormal noises when stepping on the accelerator?
2 Answers
Volkswagen Sagitar's abnormal noise when stepping on the accelerator can be caused by excessive carbon deposits, early ignition timing, low RPM in high gear, or the use of low-octane gasoline. Carbon deposits on the piston top: The main reason is the presence of carbon deposits on the piston top. These deposits form a highly intense hot surface, causing the fuel-air mixture in the combustion chamber to self-ignite before reaching the ignition stroke. Although this combustion appears sufficient, it is actually self-ignition or premature ignition, not occurring within the designated stroke, leading to metal knocking sounds from the piston hitting the cylinder wall. Other reasons: Excessive carbon deposits, early ignition timing, low RPM in high gear, or the use of low-octane gasoline can all trigger such malfunctions.
My Volkswagen Sagitar has been running for over five years, and recently it started making a squeaking sound when I press the accelerator. It's commonly caused by a loose or aging timing belt slipping, especially noticeable under heavy engine load during acceleration. The alternator belt could also be the issue, particularly prone to drying out and loosening in hot weather. The mechanic last time mentioned that belt slippage could affect power output and fuel consumption, and if left unchecked, a snapped belt could even cause the engine to stall, which is more dangerous. It's recommended to check the belt tension and surface for cracks or wear every six months, tightening it if loose; replace it immediately if severe wear is found to avoid more costly and troublesome repairs later. Regularly cleaning engine dust can also reduce potential noise sources. Fellow drivers, pay attention to small issues to prevent bigger troubles.
