What Causes Abnormal Noise When Accelerating the Engine?

[McRose]

Engine acceleration abnormal noise causes include a damaged carbon canister solenoid valve, among others. The specific reasons for abnormal noise during engine acceleration are as follows: Loose screws at the three-way catalytic converter interface: Thermal expansion and contraction after turning off the engine can make the noise more noticeable. The solution is to tighten the screws. Damaged carbon canister solenoid valve: This can easily cause the fuel tank to deform and produce noise. The solution is to replace the carbon canister solenoid valve. Faulty operation of the starter's solenoid pull-in motor: The pull-in motor is used to engage the starter's gear with the engine flywheel. After turning off the engine, the pull-in motor should disengage the gear. If it operates poorly, abnormal noise is likely to occur. The solution is to replace the solenoid pull-in motor. Abnormal noise caused by uneven engine cooling: After driving for a while, the engine temperature becomes very high. When the engine is turned off, the temperature of various components decreases, and thermal contraction does not occur uniformly. This inevitably leads to gaps between internal metal components, causing friction and abnormal noise due to cooling contraction.