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Thread: How do I remove a broken spark plug?

  1. #21
    Delorean Guru
    Join Date:  May 2011

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    Well you lucked out. Was it the correct adapter in the first place? Why did it break off and get stuck? Make sure it did not damage the threads in the head. Run a thread chaser or a tap to make sure.
    David Teitelbaum

  2. #22
    Owner since 2007 Farrar's Avatar
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    I fault the design of the tube that came with the compression tester - it was screwed together rather than being one solid piece. (Since the tube is now broken, I will use the hose instead.) It didn't take much to remove the thing, which means it wasn't badly stuck in the first place, and in my opinion the tool was poorly designed to have a weak point so close to the end.

    The threads are fine - I gently put the spark plug in and took it back out by hand and it was as smooth as silk. Cleaned the threads and then reinstalled with fresh anti-seize. Moving on to the next project now.
    DeLorean status: It's complicated.

  3. #23
    Not a DeLorean Guru
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    Please let me know what the compression numbers are once you've done the test.
    -Mike
    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  4. #24
    Owner since 2007 Farrar's Avatar
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    Quote Originally Posted by opethmike View Post
    Please let me know what the compression numbers are once you've done the test.
    Will do. Might be another week or so.
    DeLorean status: It's complicated.

  5. #25
    Administrator Ron's Avatar
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    Quote Originally Posted by dn010 View Post
    So donít run the motor then. But find a way to heat the head up. Heat makes things much easier to remove.
    FWIW, spark plug manufacturers and shop manuals all have warnings to let aluminum heads cool before removing the plugs...

  6. #26
    EFI'd dn010's Avatar
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    Quote Originally Posted by Ron View Post
    FWIW, spark plug manufacturers and shop manuals all have warnings to let aluminum heads cool before removing the plugs...
    Understood, but the situation here is trying to remove a stuck object. Running the engine with the cylinder dead wonít make the steel object expand like a spark plug that is firing.

    Regardless, congratulations on getting it out. Now, onto the next problem.
    -----Dan B.

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