P0301 Misfire Detected in #1 Cylinder

来源: ymmud 于 2024-09-05 15:51:29 [] [旧帖] [给我悄悄话] 阅读数 : (1098 bytes)

Please forgive me as I can not type Chinese on the PC I am using.

Background:  About a year ago I replaced the 4 spark plugs for my 2012 Subaru Legacy. It took me a while to unscrew the old spark plugs and took them out but when I tightened the new spark plugs pretty soon I felt it was already tight and I did not go any further because I did not want to overtighten them.  Several days alter my check engine light was on and the code was P0301 Misfire Dected in #1 Cylinder. I tried to tighten the spark plug again but it was still pretty tight so I just erased the code and the car was running fine for about a year. 

recently the code P0301 came back again and if I erased it the check engine light will turn on again the next day. Now what can I do? I can bring the car to a dealership but just feel it is stupid if the problem is the spark plug is not tighten enough. Should I just try unscrewing the spark plug and tightening it again and see how it goes?  Or should i just let a mechanic to handle it?

 

Thanks!

所有跟帖： 

• Swap it with another see if you get the same code -acac- ♂ 给 acac 发送悄悄话 (0 bytes) () 09/05/2024 postreply 16:09:20

• you mean swap spark plugs? for example switching 1 and 2? -ymmud- ♀ 给 ymmud 发送悄悄话 (0 bytes) () 09/05/2024 postreply 18:44:58

• 最好用torque wrench按Spec上紧，但是你的问题不像是没上紧吧。 -老九不能走- ♂ 给 老九不能走 发送悄悄话 老九不能走 的博客首页 (0 bytes) () 09/05/2024 postreply 16:12:55

• harbor的小力矩绝对不行，amazon的UYECOVE还不错 -chinomango- ♂ 给 chinomango 发送悄悄话 chinomango 的博客首页 (0 bytes) () 09/07/2024 postreply 18:02:22

• 第一，Engine哆嗦吗 -biglow- ♂ 给 biglow 发送悄悄话 biglow 的博客首页 (267 bytes) () 09/05/2024 postreply 18:44:19

• no shaking or exessive vibration. Should I still check coil? -ymmud- ♀ 给 ymmud 发送悄悄话 (0 bytes) () 09/05/2024 postreply 18:46:11

• can the fuel line clogged causing not enough fuel? -leslieking- ♂ 给 leslieking 发送悄悄话 (0 bytes) () 09/05/2024 postreply 20:48:00

• 换一下1和2的Coil看看；跑了多少迈了？可能Coil该换了 -soccer88- ♂ 给 soccer88 发送悄悄话 soccer88 的博客首页 (0 bytes) () 09/05/2024 postreply 21:22:20

• 一年多没事，大概率不是松紧的问题，最忌火花塞拧过头；单缸失火有两个最大可能，火花塞和点火线圈, 找一个对照缸，分别调换 -mountrobson- ♂ 给 mountrobson 发送悄悄话 (235 bytes) () 09/06/2024 postreply 08:14:48

• thanks, will do -ymmud- ♀ 给 ymmud 发送悄悄话 (0 bytes) () 09/06/2024 postreply 09:15:24

• 点火线圈或你拧花了 -chinomango- ♂ 给 chinomango 发送悄悄话 chinomango 的博客首页 (0 bytes) () 09/07/2024 postreply 18:02:48

• also got both P0301 and P0303 at one time -ymmud- ♀ 给 ymmud 发送悄悄话 (111 bytes) () 09/06/2024 postreply 09:14:22

• focus on 301 first, 303 might be caused from it -mountrobson- ♂ 给 mountrobson 发送悄悄话 (0 bytes) () 09/06/2024 postreply 09:36:21

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