What causes abnormal noise when accelerating at low speeds in a Corolla?

[AthenaRose]

Abnormal noise during low-speed acceleration in a Corolla is primarily caused by using inferior quality engine oil, prolonged intervals between oil changes, or insufficient oil levels. These conditions can increase friction between components such as valves and guides, as well as hydraulic lifters, resulting in amplified engine noises. Steps for changing engine oil: Lift the vehicle and remove the underbody protection panel. Place a container beneath the oil drain plug; loosen the drain plug and use an air gun to blow for two minutes at the oil filler port. After draining, tighten the drain plug and wipe it with a tissue to check for leaks; reinstall the protection panel and lower the vehicle. Finally, add new oil through the filler port. Consequences of driving with insufficient oil: Firstly, lubrication effectiveness significantly deteriorates. Secondly, lack of proper lubrication may lead to engine seizure. The severity of damage increases with lower oil levels.