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  1. #1
    Crazy SVT Poster T800's Avatar
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    Does this look typical? (blown plug)

    Hey guys,

    Same old story, had a slight tick...got on the freeway..."WTF!?"...pulled over.

    Question being, does this look typical? I was surprised at the amount of thread damage to the plug itself. Any insight would be appreciated.

    Of course on the way back an autocrossed-out S2000 and a 2012 SS wanted to play.

    Overall:



    And this one shows the strap hammered onto the electrode:


  2. #2
    SVT God 95PGTTech's Avatar
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    check the threads on the head? I would be most concerned about the smashed strap (piston, valve, debris?)
    1998 CY Cobra coupe - nearly rusted to the jack stands

  3. #3
    Crazy SVT Poster T800's Avatar
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    Quote Originally Posted by 95PGTTech View Post
    check the threads on the head? I would be most concerned about the smashed strap (piston, valve, debris?)
    I agree. That was my reasoning for posting ,even though this is a somewhat "common" issue. That strap makes me think it hit the piston...

    EDIT: Just got a better look down in the chamber...threads are history and it looks like somebody dumped a bunch of fairy dust down the hole. Assume it's what were once the threads in the cylinder head.

    Also, seems to be a lot of oil on the plug and in the combustion chamber. Not gallons...but.
    Last edited by T800; 07-08-2012 at 12:58 AM.

  4. #4
    Crazy SVT Poster T800's Avatar
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    Does the ECU shut down fuel to that cylinder since there is no coil(spark)?

    Reason I ask, can I drive it to the shop Monday or am I asking for trouble?

  5. #5
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    Quote Originally Posted by T800 View Post
    Does the ECU shut down fuel to that cylinder since there is no coil(spark)?

    Reason I ask, can I drive it to the shop Monday or am I asking for trouble?
    That doesn't look good and I would not risk driving it if there are metal shavings in the cylinder. Hope everything turns out ok.




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  6. #6
    Crazy SVT Poster T800's Avatar
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    Quote Originally Posted by fbody83 View Post
    That doesn't look good and I would not risk driving it if there are metal shavings in the cylinder. Hope everything turns out ok.
    Thanks buddy...me too.

  7. #7
    SVT Addict BLU3VN0M's Avatar
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    I wouldn't even attempt to start it, much less drive it, before i took the heads off to check out the piston. At the least you're gonna have metal shavings in there. I would much rather be replacing a few piston's and rethreading the hole than to be buying a whole new block because you threw a rod out the side after trying to drive it. just my .02

  8. #8
    Crazy SVT Poster 04-OW-COBRA's Avatar
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    This is a big problem with the Lightnings. Yes you can drive it if the distance isn't to far just make sure you disconnect the injector for that cylinder.
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  9. #9
    Insane SVT Poster SVTDice's Avatar
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    You can take one of those extendable magnet pen's and slide it down into the spark plug hole and see how much shavings you can get out, They may be shavings from the plug but I doubt it, I hope you get it all sorted out man!
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  10. #10
    SVT God KILRSVT's Avatar
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    That sucks hope that doesn't happen to me after my auto x tomorrow
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  11. #11
    Crazy SVT Poster T800's Avatar
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    Thanks for the support guys. Right after it happened I drove the car about 10mi on the freeway to get back home. I'm feeling like that piston is toast.

    Here's a pic of the piston/"shavings"...best I could do...it's getting dark outside. (sorry about the crappy cell phone pic)

    Suck:

    Last edited by T800; 07-07-2012 at 11:20 PM.

  12. #12
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    Im sure that piston is toast, but now you have to look at saving the rest of them and the block. I would not drive it anymore untill the head is off and you can inspect it good. All it takes is a small peice of that stuff to screw up that cylinder wall and your eating a full set of pistons and a machine shop bill along side the bill from the heads...
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  13. #13
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    Ring land might've gone with that electrode damage. Had it happen to me before on my gt.
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  14. #14
    Crazy SVT Poster T800's Avatar
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    Went out this morning.

    From what I can tell, that last pic is what the top of the piston looks like now. Tried to wipe off some of what looks like shavings from the head and they don't budge. I'm thinking the credit card is going to get its a$$ kicked come Monday.

  15. #15
    Crazy SVT Poster Kwik03DSG's Avatar
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    Piston is done... funny how the cylinder wall doesn't look scored after that, but the speckled areas on the dish look like detonation..

    Were you in boost when that happened or just cruising?

  16. #16
    Relax! I'm a Doctor! 1wild-horse's Avatar
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    fix the threads and pump the cylinder. they all look like that when they blow out. My father in law blew one on his v-10 w/ 83k. I took it to work and put a lock n stitch in it, he's been driving it ever since and now has 150k runs great. I'm sure it's fine.

    BTW this is so commonplace anymore with 2v and 4v heads. done so many I've lost count, but NEVER had one come back or have a dead cylinder after the fix.

  17. #17
    SVT God Blueline's Avatar
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    The plug looks all banged up from bouncing around in the well.

    Get your self a boroscope so you can look in the cylinder / piston before spending any money and pulling anything apart. Once you get a good look in there and feel comfortable with your findings, move on to the next step. You may get off scott free with a new plug and on your way... $2.00 fix. Helicoil if needed.. etc. You need to investigate it some.

    Good luck!
    Last edited by Blueline; 07-08-2012 at 12:00 PM.

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  18. #18
    Crazy SVT Poster T800's Avatar
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    Quote Originally Posted by Kwik03DSG View Post
    Piston is done... funny how the cylinder wall doesn't look scored after that, but the speckled areas on the dish look like detonation..

    Were you in boost when that happened or just cruising?
    Maybe a pound or two. Was passing, no downshift, just added a little go pedal. You know how the boost rises a little when you add some pedal in 6th...nothing crazy.

    Quote Originally Posted by 1wild-horse View Post
    fix the threads and pump the cylinder. they all look like that when they blow out. My father in law blew one on his v-10 w/ 83k. I took it to work and put a lock n stitch in it, he's been driving it ever since and now has 150k runs great. I'm sure it's fine.

    BTW this is so commonplace anymore with 2v and 4v heads. done so many I've lost count, but NEVER had one come back or have a dead cylinder after the fix.
    Gives me some hope. The piston definitely looks jacked up though...

    Quote Originally Posted by Blueline View Post
    The plug looks all banged up from bouncing around in the well.

    Get your self a boroscope so you can look in the cylinder / piston before spending any money and pulling anything apart. Once you get a good look in there and feel comfortable with your findings, move on to the next step. You may get off scott free with a new plug and on your way... $2.00 fix. Helicoil if needed.. etc. You need to investigate it some.

    Good luck!
    Threads are history for sure...I can see that much. Gonna have to Time-Sert or LocknStitch the head. Wonder if Harbor Frieght sells a borascope...

  19. #19
    Angry Turtle Brutal DSG's Avatar
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    Quote Originally Posted by 1wild-horse View Post
    fix the threads and pump the cylinder. they all look like that when they blow out. My father in law blew one on his v-10 w/ 83k. I took it to work and put a lock n stitch in it, he's been driving it ever since and now has 150k runs great. I'm sure it's fine.

    BTW this is so commonplace anymore with 2v and 4v heads. done so many I've lost count, but NEVER had one come back or have a dead cylinder after the fix.
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  20. #20
    SVT God Bdubbs's Avatar
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    Can someone explain to me what cause's this?
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  21. #21
    Relax! I'm a Doctor! 1wild-horse's Avatar
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    not enough thread depth, overtorque, fatigue of the aluminum. Could be any of those reasons. I've repaired heads that have blown out original plugs with 60k on the clock. but Ive also seen replacement plugs blow out... and the plug gets beat up from banging around in the s.p. well just like Blueline said. The 2v motors have a small bolt holding the coil down and there's enough force to break the plastic tab off the side of the coil. And it splits the boot open like a hot dog in the microwave.

  22. #22
    SVT God Bdubbs's Avatar
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    Quote Originally Posted by 1wild-horse View Post
    not enough thread depth, overtorque, fatigue of the aluminum. Could be any of those reasons. I've repaired heads that have blown out original plugs with 60k on the clock. but Ive also seen replacement plugs blow out... and the plug gets beat up from banging around in the s.p. well just like Blueline said. The 2v motors have a small bolt holding the coil down and there's enough force to break the plastic tab off the side of the coil. And it splits the boot open like a hot dog in the microwave.
    Dang thats really sucks. I guess I'll have to check the plugs again and make sure there tight. I actually use a inch/lb torque wrench and tq them to specs, because I don't trust myself.

  23. #23
    I would let the cylinder dry out for a while and use a strong vacuum cleaner with a pointed tip to try and such as much of those shavings out as possible.

    Typically detention will cause that ground strap to "melt" off. Happened to me once.

    Dont drive it, start it, or rotate the engine in any manor. It will only make things worse inside that cylinder.

  24. #24
    Crazy SVT Poster T800's Avatar
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    Quote Originally Posted by Bdubbs View Post
    Can someone explain to me what cause's this?
    I agree with everythin that has been posted thus far. My honest opinion is that due to the lack of thread depth, once a plug that may not have been properly torqued comes loose...you are left with just a couple threads holding the plug in.

    The ticking was a tell-tale indicator and I have read other posts that cited this issue just before losing the plug. I feel that if I had identified the ticking as a leak at the cylinder and not due to exhaust leak or a pulley, etc. I could have torqued it down and been fine. It's just too fine a line with only 4 threads to work with.

    I could be wrong...it's happened before, just can't remember when.

  25. #25
    Crazy SVT Poster T800's Avatar
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    Update.

    After calling many of the "performance" shops around here, including one that you locals to my area know of(who by the way pushed to replace the entire head+labor $3-4K). <---no prizes for guessing who THAT was.

    Called Ford of Bellevue, service guy knew right off what I was talking about, said they use the LocknStitch aluminum insert. Quoted me $62.50 + cost of the insert itself. Dropping the car off Wednesday @07:30. Will let you guys know how it goes. I will definitely put it to the test!

    Thanks for all the advice and good wishes. The community here is top notch.

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