advice needed - stubborn tight spark plug

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Northstar Engines and System Technical Discussion Discussion, advice needed - stubborn tight spark plug in Cadillac Engine Discussion; I just replaced my front/left coil pack on my 2000 Seville, this solved my misfire problem. I wanted to check ...
  1. #1
    SmoothTS is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jan 2008

    advice needed - stubborn tight spark plug

    I just replaced my front/left coil pack on my 2000 Seville, this solved my misfire problem. I wanted to check the plugs to make sure none were fouled by the bad coil. The first two plugs came out without much effort, very little force needed to turn them out. The third plug would not budge, so I torqed a little harder, still didn't want to turn. Not wanting to damage the threads I gave up and easily removed the forth plug. Of the plugs I removed, one was kind of sooty, the other two were clean. I really want to check on that last plug if I can get it out. Any thoughts on how I can CAREFULLY remove it? I don't know these mechanics' tricks! Thank you in advance!

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 65500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: advice needed - stubborn tight spark plug

    Before you resort to an impact wrench, let the plug well soak in PB Blaster penetrant overnight. Always pull the plugs from a cold engine, and torque to 13 ft/lb.

    Once you remove the plugs, you might want to replace them with a new set of ACDelco 41-987's from .

  4. #3
    misfit6794 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Deville (sold), 2000 Mustang GT
    Join Date
    Jan 2007

    Re: advice needed - stubborn tight spark plug

    When I had the headgaskets done my mechanic had to let the head sit for two days with pb blaster on the plug just to get it out. You definetly don't wanna ruin your head.

  5. #4
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Fairbanks, Ak

    Re: advice needed - stubborn tight spark plug

    Find a piece of iron water pipe that slips over the insulator and contacts the steel body of the plug. Cut off about a foot of the pipe, slip it over the stuck plug, give it a good healthy smack with a medium sized hammer, and you should be good to go. This should shock the carbon/corrosion or what have you that is sticking the plug. Try turning the plug both directions slightly, back and forth, if it loosens just a little bit.
    Don't mess with Binky Bear!

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