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Cylinder 3 Misfire after spark plug change.

This is a discussion on Cylinder 3 Misfire after spark plug change. within the General Help forums, part of the LSx Technical Help Section category; It'd never seen rain before i bought it. I purchased it through Carmax, and they purchased it from a dealership ...

  1. #61
    Member first01SS's Avatar
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    It'd never seen rain before i bought it. I purchased it through Carmax, and they purchased it from a dealership (I tracked its history, and previous owners). The original owner was a dealership; it was driven by the owner-only and had 26k miles on it. It was in a showroom floor, indoors, and dealership kept.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    OK. Then possibly there was a fluke gasket installed. Gaskets can go from engine vibrations as well. Did the noise sound like it was coming from the top of the motor, or underneath?

  3. #63
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    under

  4. #64
    Smiles for 9.5 Years cammed goat's Avatar
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    OK. Then that's the flange gasket. Prob at the Y-pipe. You could prob replace that with ramps, and some tools. Or go to a muffler shop and have the gasket installed. Cheaper than the dealer.

  5. #65
    Member edbird's Avatar
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    1999 trans am convert

    If you think you may be losing compression in that cylinder and you think it may be from spark plug and this happened right after a spark plug change I'm thinking something wrong with threads.And that probably eliminates burned exhaust valve, bent intake or exhaust valve, weak or broken valve spring, or worn camshaft lobes.
    Don't know anything that will seal thread for sure-try teflon tape,it's worth a shot but may not hold up.

  6. #66
    Smiles for 9.5 Years cammed goat's Avatar
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    Cross-threaded? I've been there. It sucks.

  7. #67
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    My mistake was not reading the box and doing it while it was hot; I think that was my first mistake. Second was (I think) over torqein' the spark plugs. Although I did it by hand, I think I over did it. I feel really stupid if that's it, but I've been trying to eliminate everything else.

  8. #68
    Smiles for 9.5 Years cammed goat's Avatar
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    Well, try a thread tap. This will, HOPEFULLY, save you the trouble of pulling the head and sending it to the machine shop. The engine was hot eh? You might have pulled the threads out of the head when you pulled that plug. Never pull plugs oout of a hot motor. I did that with my first car. Also, if your motor is like other LsXs then the plugs go in on a slant. If you can re-tap the threads and reinstall the plug in cyl #3 then you're back on the road in little time.

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    You would think an engineer (myself) would be smarter than that huh? I suppose this is a hard lesson in hurrying a job. Failing that I don't fix this with reletave ease, I was considering patriot heads... I would, however, like to not go there and just enjoy what I have.. How would I tell if I've cross-threaded the hole?

  10. #70
    Smiles for 9.5 Years cammed goat's Avatar
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    Was the old plug difficult to remove? Also, check the threads on the new plug. If the threads on the new plug are "squished" or just flat-out gone, then you pulled the threads out of the head. Hopefully, you didn't damage the entire spark plug port, or you will be spending $$$ on a re-thread/new head(s). Aluminum heads DO NOT like tune ups while hot. If/when you get the thread tap, start it by hand, then go at it with a ratchet with a small (3 in.?) extension. You might have to do this a few times to cut/clean the threads in the head. Use petroleum jelly on the tap to catch the metal shavings as well. You WILL, however, have to turn the motor over for a sec without the plug in the head to blow out the rest of the shavings the tap may have missed.

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    goes in fine, won't tighten all the way. Just "real close" to very tight

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    Quote Originally Posted by first01SS View Post
    goes in fine, won't tighten all the way. Just "real close" to very tight
    You got lucky. Still have to clean the threads though. The plug has to go in all the way. Or, you could get a thread chaser and go over the threads on the plug itself.

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    I just checked the threads on the spark plugs; they are ok; very clean.

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    Then check the threads in the head. Remember, you have to tighten the plugs till they "bottom out". From your descrip sounds like the plug isn't going in all the way. Everything has to be 100% sealed for the motor to run right.

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    Does the idle fluctuate?
    Last edited by 9t8z28; 01-20-2009 at 08:19 PM.

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    Quote Originally Posted by first01SS View Post
    goes in fine, won't tighten all the way. Just "real close" to very tight
    So the spark plug keeps turning? Sounds stripped

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    Idle does not fluctuate more than +/- 50 RPM Max, at idle, typically during a misfire. It won't tighten to a stop, just very close.

  18. #78
    Senior Member clg82's Avatar
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    keep us updated on what happens..........I actually took mine to get a tune up plugs, wires, etc......and they didn't torque one of the spark plugs down all the way......long story short it sounded like I had an exhaust leak like you explained by the weird sucking noise, but the jackasses that did it stripped one of the plugs threads.....thank god they paid to fix it........idiots! Good luck man~Chris
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

  19. #79
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    as a test, this morning I took a generous amount of Teflon tape, and wrapped it around a new TR6 plug. I inserted it into the head, and it was VERY tight. I am still experncing a misfire. I also, as a test, I sprayed carb cleaner around the cylinder to see if it was sucking in air from the side. It did not lean up. My last hope is that it is a injector. I'll do that this Saturday.

  20. #80
    Senior Member 1MileCrash's Avatar
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    this may be a redundant question but...

    did you save all of your old plugs and if so have you tried putting all of the old plugs back on the car and giving that a whirl. pain in the ass no doubt...but i've heard stories from fellas that said that they put new plugs on their car and it ran like shit...put the old plugs back in and it ran like a top.

    worth a shot at this point.

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