What Causes the Noise When Releasing the Accelerator but Not When Pressing It?
2 Answers
Specific reasons for the noise when releasing the accelerator but not when pressing it: 1. The engine components are not sufficiently lubricated by the oil, and it takes some time for the engine parts to be evenly lubricated. 2. Severe wear of engine components requires internal cleaning of the engine to reduce the wear gaps. 3. Large gaps and poor sealing can worsen the engine condition, possibly leading to noise; it is recommended to check at a repair shop. 4. It may be caused by excessive carbon buildup in the engine, which can be cleaned at a repair shop. 5. It could also be due to poor filtration, most commonly caused by a dirty air filter, which can be cleaned or replaced at a repair shop. 6. If the gasoline used is not pure enough, it can also cause this phenomenon, as impure gasoline tends to form carbon deposits inside the engine.
I drive an old Accord and had a similar issue before - a squeaking sound when releasing the throttle that disappeared during acceleration. Through my own troubleshooting, I found it was caused by worn-out engine mount bushings. When you let off the throttle, the engine's inertia makes it rebound and hit the frame, causing noise. During acceleration, the engine stays stable under load and stays quiet. I recommend getting the mounting system checked at a repair shop - it could also involve loose exhaust hangers or driveshaft bearing issues. Leaving it unfixed long-term will increase vibrations and damage other components. Driving safety is crucial - if the noise worsens, avoid highway speeds. Remember to regularly inspect these areas during maintenance to prevent future problems.
