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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; Originally Posted by first01SS Replacing the gaskets made no change. Also, I think I may be loosing compression through the ...

  1. #21
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by first01SS View Post
    Replacing the gaskets made no change. Also, I think I may be loosing compression through the spark plug hole, and it didn't show up on a compression test because the compression tester has a rubber o-ring on it. Is there any kind of sealing soluition that I can put around the spark plug (like high temp RTV) to seal around the plug?
    I would NEVER recommend this to anyone....
    But JB Weld would seal it. It won't come out though. Ever.


    Does it thread in with ease?

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    Correct. I want to shoot myself. I won't be JB welding it in place, simply because i won't be able to get it out, and its too much trouble if there is ever a problem. I'm tempted to just swap heads, and use my stock cam. A lazy injector? A weak spring? i'm open for anything..........
    Last edited by first01SS; 01-20-2009 at 09:47 AM.

  3. #23
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    is it possible to run the engine while the compression tester is in the hole?

  4. #24
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    I have helped my coworkers with that. DON'T run the motor too long. Maybe a few seconds.

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    Member first01SS's Avatar
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    Well, the important thing is, will this yeild different results than a cold crank/turn over test? There seems to be no loss of pressure of any kind (for more than 10 min) in the cylinder. I can't think of anything else, other than a weak spring/damaged spark plug thread.... again, there's also the fuel injector, but something tells me that it isn't that.

  6. #26
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    Have you pulled the valve cover off the head to see if there is a bad spring, bent valve? I don't think there is a difference between a turnover test and a little running test as I have been in the car being tested while my coworker is reading the gauge.

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    Yes We removed the valve covers Sunday, Spring doesn't appear bad, a bent valve is almost impossible to see/tell without removing it.

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    I am wondering if there is a problem with the wiring/harness going to the coil. Maybe a wire rubbed against something and got damaged/burned. But, I have heard many horror stories with nitrous. Damaged heads, pistons, O2 sensors, plugs, etc.

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    I've never sprayed it. I installed the system, and was changing out spark plugs to spray it for the first time this weekend, when i encountered this issue.

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    1. switched coils
    2. switched plugs
    3. switched wires
    4. new gasket

    All 4 done and no change ?

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    bingo.

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    Something is DEFINATELY up here. Now, did the miss start before or after the tune up? Now I am thinking you may have a bad plug in cyl #3. I have heard stories of plugs being cracked while being installed on LsX cars back when I was on another forum. If you have headers, you may have cracked a plug upon install.

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    Quote Originally Posted by Danger731 View Post
    1. switched coils
    2. switched plugs
    3. switched wires
    4. new gasket

    All 4 done and no change ?
    #2 Switched plugs. He didn't get around to modifying the stock tune.

  14. #34
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    So the car isn't tuned yet?

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    There have been no changes made to the stock engine past the Quicktime cutout, and SLP lid. Everything else is as-is from factory, all the way down to the wheels. Spark plugs were changes professionally once before i received the car (i know because #8 wasn't changed. Still had factory plug in.) Car had Bosh Platinum plugs. As of right now, car has 7 NGK-TR6 plugs, and a single Autolite 103 plug that i put in this morning in order to make absolutely sure it wasn't an ignition issue.
    Last edited by first01SS; 01-20-2009 at 11:00 AM. Reason: Correction

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    This is some strange-ass shit. Stock motor with a miss? After a tune up? In my exerience with my own cars, when there was a miss, I would swap coils and plugs to see if that cured anything. And it did. There has got to be a loose connection somewhere, a bum plug, a dirty MAF, bad O2. To start with, anyway.

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    Want something even better? 40k miles. 2 passes on a 1/8 mile track, street tires. Never drag raced, never sprayed. All highway miles.

  18. #38
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    Did you use pump gas at the track or race gas?

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    Pump gas, 92/3 Octane

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    Misfire while idling...now I am thinking an O2 is on the way out. Doesn't sound internal.

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