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故障现象一辆2008款本田雅阁2.4L轿车,累计行驶里程约为13万km,只要发动机转速低于怠速转速(如开空调时),气缸盖处就会发出“咔嗒、咔嗒”的异响,且响声很大,但当发动机转速恢复到怠速转速或高于怠速转速时,异响消失。故障诊断利用听诊器进行检查,感觉异响是由凸轮轴摇臂发出的;经进一步检查,推断异响是由第3缸和第4缸的VTEC摇臂组发出的。拆下气门室盖检查第3缸和第4缸的VTEC摇臂,未见异常;拆检VTEC电磁阀总成,发现VTEC电磁阀的阀心卡滞。
Symptom A 2008 Honda Accord 2.4L sedan, the cumulative mileage of about 130,000 km, as long as the engine speed is lower than idle speed (such as air conditioning), the cylinder head will be issued at the “click, click” Abnormal noise, and a loud noise, but when the engine speed to idle speed or idle speed above idle, the noise disappears. Fault diagnosis Stethoscope was used for inspection. The abnormal noise was detected by the camshaft rocker. After further examination, it was concluded that the abnormal sound was emitted by the VTEC rocker arm of the 3rd and 4th cylinders. Remove the valve cover to check the 3rd and 4th cylinder VTEC rocker arm, no exception; remove the VTEC solenoid valve assembly and found VTEC solenoid valve plug stuck.