1. #1
    Join Date
    Sep 2013

    Need to rethread a plug hole from a blown plug

    Bought an '11 Vic with the 4.6L back in June and a few months back I tried to change out the plugs. All came out ok except for cyl 4 which only cranked out 1/4 turn. Had a shop take it out and they said they had to redo the threads. I've seen videos where you can remove a stuck plug by drilling into it somehow, but because this was in the 4 position and hard to get to I'm guessing they just power cranked it out. Not sure but I'm guessing those threads are compromised now.

    Well, this past weekend that same plug blew out of cyl 4. Inspection reveals a coil and boot jammed up underneath the fuel rail and a plug that I fished out without any turning. When I go to install a new plug it just sits on top of the threads and turns without going in. So I guess what's happened is that the plug rotated most of the way out but when it got to the last couple threads the compression blew it out the rest of the way, and that it's just the top few threads in the hole that are damaged. Inspection of the plug reveals that most of the threads are intact except for the 2-3 that are closest to the element.

    So my question is...should I try to fix this myself or just take it to a shop? Some kind of tap tool would probably fix it, but since it's the beginning threads that are boogered it'd probably have to start from the inside of the cylinder. I really don't have a clue as to how to approach this.

  2. #2
    TerryMason's Avatar
    TerryMason is offline Administrator
    Join Date
    Dec 1999
    Virginia Beach VA

    Re: Need to rethread a plug hole from a blown plug

    I have not experience with this, but I remember watching a video where they used a helicoil to repair this. You tap the plug hole larger, then put in an insert that is threaded on both sides.

    --Here is a video

  3. #3
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
    Join Date
    Feb 2009
    Dayton Ohio Area

    Re: Need to rethread a plug hole from a blown plug

    I think you only get one shot at this. But Iíve seen if work.

    Sent from my iPhone using Jeepz.com mobile app
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  4. #4
    ndnatty's Avatar
    ndnatty is offline Senior Member
    Join Date
    Apr 2003
    Pembroke Pines, FL

    Re: Need to rethread a plug hole from a blown plug

    I had this done on an old Chevy cavalier. Worked like a charm, but I had to have someone do it for me.

    Sent from my iPad using Jeepz.com mobile app

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