Off-cylinder engine misfire

Automotive common abnormal sound can be divided into powertrain abnormal sound, abnormal sound transmission system, driving system abnormal sound, drag abnormal noise and other categories.
1, powertrain abnormal sound
Failure occurred mainly in the engine and its related components, abnormal noise with the engine speed and change, and the frequency is higher.a. Off-cylinder engine misfire.
b. Decrease the efficiency of the engine lubrication system caused by excessive friction parts.
c. Belts, angular contact ball bearing wear abnormal sound.
2, abnormal sound transmission systemDriveline abnormal noise often comes from gearbox, differential, clutch and other components with abnormal sound gear and clutch showing a significant change in status change.3, the driving system abnormal soundDepartment of abnormal noise and driving car driving status (speed, steering) are directly related.4, the drag noise
Vehicle reaches a fixed value abnormal sound obvious, speed decreases abnormal sound disappears. Mentioned here non-normal drag caused abnormal sound. Such abnormal noise caused by the flow separation around the body pressure changes generated noise. Specifically including cavity resonance, noise catheter tube and the antenna, wiper, mirrors and other accessories vibrations caused spoiler. Seal open, plastic parts can cause rupture of the exterior curve changes caused by traveling to the high speed air spoiler form abnormal sound.