气门背部形成积炭带来直接后果是汽车拖拉机发动机加速不良,怠速不稳,有时伴有进气歧管放炮、冷车启动困难等一系列问题。为防止污染空气,工程师们把汽车拖拉机发动机内部的 The back of the valve to form a carbon deposition with the direct consequence of poor acceleration of the car tractor engine, idle instability, sometimes accompanied by intake manifold blasting, cold start difficult and a series of problems. To prevent pollution of the air, engineers put the car inside the tractor engine