What Causes the Loud Noise When Accelerating in a Teana?

[OAdriel]

Teana produces loud noise when accelerating due to reasons such as throttle carbon buildup, low water temperature, and engine overheating, as detailed below: Throttle Carbon Buildup: This causes the throttle opening to be too small during startup. The system's adaptive response increases the throttle opening, resulting in the sound of the engine accelerating. Low Water Temperature: The ECM perceives the water temperature as too low and automatically increases the idle speed to raise the water temperature, hence the loud noise when accelerating. Once normal temperature is reached, the idle speed returns to normal, and the noise subsides. Engine Overheating: The engine may produce a hissing sound, similar to steam or air escaping from the engine. Typically, after hearing this sound, the engine rapidly loses power. In case of engine overheating, check the cooling system.