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Fouling plugs??

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Old 02-02-2013, 02:07 PM
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Default Fouling plugs??

I have a 4.8 with a set of 241 fbody heads on it. A fresh set of plugs and it runs great, a day or two of driving and then climb on it and it breaks up under full boost. It has a good tune and everything looks good as far as fueling goes. I done a compression test and all cylinders were between 136 and 141 except number 3 and it was 170 :-/

Do you guys have any helpful information for me??
Old 02-02-2013, 04:47 PM
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What plugs are you using? What gap? When you say fouling, is it fuel or carbon on the plug? Can you post a pic? Do all plugs foul the same, or is #3 have more carbon? How much boost?
Old 02-02-2013, 05:37 PM
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Ngk tr6 .036

Plug looks great but down deeper on the porcelain, it is really black and appears to have slight cracks. No wetness on the plugs, tip is clean and all plugs have the same look! I am on 13lbs, 6lbs when towing. Thanks in advance!
Old 02-02-2013, 06:00 PM
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Old 02-02-2013, 06:17 PM
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Re-gap them to .028 and report back
Old 02-02-2013, 06:48 PM
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Originally Posted by lglowe
Re-gap them to .028 and report back
I think this will help too.
Old 02-02-2013, 07:24 PM
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Ill try it, I assumed the LS ignition system was hit enough that this wouldn't be an issue.

The picture is poor but you can see how the plug gets jet black just below the threads. Thanks guys
Old 02-02-2013, 09:30 PM
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I had a similar problem during tuning with nelson and he said i was blowing out the spark at WOT. i ended up switching to the tr7 plug and it went away
Old 02-02-2013, 09:50 PM
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Hummm, that gets my mind churning!
Old 02-03-2013, 01:01 PM
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the tr7 doesnt protrude as much as the tr6 and it also is a colder plug


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