Ugly spark plug
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Ugly spark plug

  1. #1
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    Default Ugly spark plug





    Well what do you think?
    This is after about three times going out to the lake. All other plugs look fine. Ive done a comression test and it came out just a little low than the others, but within 10lbs of the highest cylinder.
    Im running a stock 454 with new dizzy and wires and NGK R YR5 plugs.
    Im burning about a 1/2 quart of oil in 3 trips to the lake also. Only thing I can note as far as changes was I added a dual plane mid rise performer intake. Im pretty sure that the gaskets are in ok but I am not sure as if the gasket matched up or not. (im not sure why I skipped that)
    Im wondering what I should do. This is my only motor that I have right now and its running fine. I dont want to miss out on the season but dont want to be stupid either and cause further harm.
    Ive got it narrowed down to leaking intake, Mis matched gasket, valve seat worn, maybe bad rings. Any help would be greatly appreciated. I trust the knowledge here than any local shop that I have around.
    Last edited by BustOuttAnuttaThouzy; 06-11-2008 at 01:15 PM.

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  3. #2
    Senior Member Widetrack's Avatar
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    No pix. try again!

  4. #3
    21 Daytona Outlaw's Avatar
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    looks like oil to me

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    Ive owned the boat for 3 seasons now and it was burning fine. I added intake last season and at the end of the season I noticed it burning oil and a fouled plug. Replaced the plugs at the start of the season and now I am here. I never had an oil issue before the intake but also never drove it as hard as when I got the intake and diverter on.
    Forgot to mention that its #8 cylinder. Whats my next course of action?
    Last edited by BustOuttAnuttaThouzy; 06-11-2008 at 01:14 PM.

  6. #5
    Senior Member Widetrack's Avatar
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    All I see is red Xs no pix. But here is my .02 worth! If your compression is good then there is a possibility of a valve guide or a valve guide seal. WT

  7. #6
    SLOW MEMBER slowboy's Avatar
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    If it started after you added the new intake, thats where I would start to look. there is a possibility that the intake gasket did not seat correctley, maybe some crud under it, and oil from the lifter valley is getting sucked into the intake causing the plug to foul.

    If the boat did not burn any oil and did not foul plugs before the intake swap, thats where I would start. It is cheap, and shouldnt take you all that long.

    I would check the valve seal after that.

    Ryan
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  8. #7
    Senior Member NO BUTT NO PUTT's Avatar
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    Do a leak down test.
    A compression test wont show you shiat.

  9. #8
    JetBoat Marine Parts&Svc jetboatperformance's Avatar
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    Default sparking Bolts

    Heres a pretty good link I just found when a saw your post Check it out ,especially 15 thru 18
    Tom

    http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

  10. #9
    Senior Member sdpm's Avatar
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    Quote Originally Posted by NO BUTT NO PUTT View Post
    Do a leak down test.
    A compression test wont show you shiat.
    I 2nd this! Your pulling oil from somewhere.

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    Thanks for the link. Best webpage on plugs that Ive seen. I just got back from the tool store and picked up a leakdown tester. Now time to go figure out how to use it.

  12. #11
    Cantard 71hallett's Avatar
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    I wonder if its a valve guide since it is not working its way to far into the plug.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member TahitiRat's Avatar
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    I would ckeack the intake first like slowboy said just my thoughts

  14. #13
    Senior Member NO BUTT NO PUTT's Avatar
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    Quote Originally Posted by TahitiRat View Post
    I would ckeack the intake first like slowboy said just my thoughts

    I would try this also. No problems. Then you change the intake manifold and now you have problems. Maybe your engine doesnt like that intake.

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    Thanks for the advice. Im going to do the leakdown check but after reading up on that test, it doesnt seem like itll show a bad valve guide. Maybe after I do the test and if it comes out ok, it eliminates a bunch of stuff.
    Say its a bad valve guide, is it head pulling time? I know im getting a little ahead of myself.
    Lastly, what should I be looking for when I remove the intake? I mean how can you tell if the gasket is leaking?

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