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Spark plug gap question...

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Old Oct 5, 2005 | 07:58 PM
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Default Spark plug gap question...
After resetting my PCM, it STILL PINGS!!!

Could I have set the plug gap too wide??? They're at .060" right now.
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Old Oct 6, 2005 | 12:14 AM
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check elsewhere for the problem.


which plugs did u use?
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Old Oct 6, 2005 | 06:59 AM
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I've been corrected for this before, but right now it has Bosch Platinums in it. There again, it didn't ping before the lid went on.
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Old Oct 6, 2005 | 08:21 AM
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You're not running 87 octane are you?
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Old Oct 6, 2005 | 08:34 AM
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Nope. Every now and again when it's stupid cheaper, I'll drop to 92, but most of the time, it sips 93-octane.
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Old Oct 6, 2005 | 12:09 PM
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if its REAL hot where u are, u could be gettin extremely high IAT. and that could be pulling off a lot of timing.. and causing knock.
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Old Oct 7, 2005 | 10:28 PM
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Here's what all I've done so far:

TB bypass

Lid

Bosch Platinums gapped at .060"

EGR mod

I'm in NORTH Georgia(any further north is NC), in the hills, and it's been hitting 85 on a hot day lately. So I doubt a hot IAT would be the culprit. I'm flat-out STUMPED.
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Old Oct 8, 2005 | 03:28 PM
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I have seen this before, look into a cooler heat range plug and it will likely fix the problem I would try the TR5 or maybe the TR6, I understand most people use these for power adders but it works real well and if you gap them to .050" they should not cause a problem, it allowed us to make like 30 more on a car that would ping on the stock tune with 100 octane before the fix!

-Bryan
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Old Oct 8, 2005 | 08:55 PM
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Default right now it has Bosch Platinums in it
I read somewhere in here that platinum plugs retain heat causing the fuel mixture to predetonate.
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Old Oct 8, 2005 | 10:04 PM
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I just wasn't thinking when I got these plugs. Guess I'm gonna pop'em out, gap'em at .050", and pop'em back in. If I get a high-end plug next time, I'll spring for those $20-each Iridiums.

Which is colder, the TR5 or TR6?
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Old Oct 9, 2005 | 07:37 AM
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TR6 plugs are colder. Part number 4177. Cost $1.59 each at O'Reilly's. I have them in my car gapped .045".
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Old Oct 9, 2005 | 08:40 AM
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Originally Posted by Ric
I just wasn't thinking when I got these plugs. Guess I'm gonna pop'em out, gap'em at .050", and pop'em back in. If I get a high-end plug next time, I'll spring for those $20-each Iridiums.

Which is colder, the TR5 or TR6?
It looks as tho you don't have any big mods (headers, catbak, tune). The NGK TR55's should be good enough. I run them gapped at .055. Never had a problem with them. People who run NOS or Forced Injection usually run the NGK TR6.
Like stated above, I have heard the same about the Bosch plugs.
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Old Oct 9, 2005 | 10:34 PM
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Good stuff, y'all. Thanks for the help.

Gonna close the gap on what I got, and hopefully I'll have LTs to put on with my next plug change.
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Old Oct 9, 2005 | 11:39 PM
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tr6 might be a little extreme for your setup.
tr55 should be great for your setup even with LT's.

i run tr55's @ .055
and they have been nothing less than perfect.
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