推荐回答（1个）
缸压不足主要有两个原因1.活塞环或缸套老化可以导致压缩比减小2.就是气门关闭不严或者气门烧熔也可以导致压缩比减小主要就是以上这些，像其他一些缸头垫片漏气或者火花塞漏气这些几率就小了。
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