What Causes the Ticking Noise When Accelerating but Not When Releasing the Throttle?

[CarolineRose]

Reasons for the ticking noise when accelerating but not when releasing the throttle: 1. If the sound is not very clear inside the car, it is generally not a major issue. Vehicles often produce corresponding ticking noises, which can be from the fuel injector working or the valve area. 2. Most cars will have slightly louder engine noise during cold starts compared to when the engine is warm. As long as the sound is uniform, smooth, and not harsh, it is usually not a problem. 3. Oil-related issues, such as using low-quality oil or not changing the oil for an extended period, can increase friction between the valves and guides or hydraulic lifters, making various engine noises more pronounced.