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Thread: Car will not start after replacing spark plugs: Solved

  1. #1
    Join Date
    Apr 2018
    Location
    Chicago, IL, USA
    Posts
    1
    My Cars
    2010, 530i

    Car will not start after replacing spark plugs: Solved

    After replacing spark plugs and tightening to the specified torque, started the car and it started as expected. When I tried starting again after it was sitting idle for two weeks or so, it will not start. Went through many forums without any help. Some mentioned about defective plugs although new. Never experienced defective new plugs before but decided to put the old plugs back to see if it will start. To my surprise, the new plugs came out without any effort, although they were tightened to 2 3 ± 3 N m ( 1 8 ± 2 f t - l b ). Replaced #1 plug and hand tightened using 6 inch ratchet and re-tightened the remaining 5 the same way. Stared the car and it stared without hesitation. Replaced the #1 plug with new plug and problem solved.

    Because I had visited many forums for help, I wanted to share my findings with the DIYers.

  2. #2
    Join Date
    Sep 2008
    Location
    Brentwood, CA
    Posts
    243
    My Cars
    2000 528iT; 2008 550i/6
    I'm sorry but I'm unclear as to your solution: did you remove ALL 6 of the new plugs and reinstall the 6 old plugs, or did you have to simply replace ONE of the new plugs?
    2007 530i sport (Montreal Blue w/ gray interior)
    2008 550i sport (Alpine White w/ black interior)

  3. #3
    Join Date
    Jan 2009
    Location
    Antelope, CA
    Posts
    424
    My Cars
    1997 BMW 528i
    Quote Originally Posted by ZeroDfx View Post
    I'm sorry but I'm unclear as to your solution: did you remove ALL 6 of the new plugs and reinstall the 6 old plugs, or did you have to simply replace ONE of the new plugs?
    The new plugs weren’t torqued down all of the way, so he lost compression on all 6 cylinders.

    Good rule of thumb, get them snug, and then crank them down a 1/2 to 1/4 turn.


    Sent from my iPhone using Tapatalk

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