1jz Plugs gapped to .20 and still blowing out spark?

kamikazemkiii

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Mar 21, 2009
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Im currently using NGK bcpr7es 6282's and I have them gapped to .20 and im still blowing spark out. Should i try to gap them lower? these plugs not good? or my coilpacks are going out?
 
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kamikazemkiii

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Mar 21, 2009
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When i go back out ill see what boost, I can make it to 14psi but theirs no power when get their. Then the wide-band starts showing lean.

I have been running 4644's without problems but i dont think these are holding up too well, anyone run/ran these?. Their the same heat range as the 4644's
 

kamikazemkiii

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Cant say 100% but thats what it feels like. Not sure how to describe it in words. Its just what it feels like.

Ill swap the plugs in a few days and see if that cures it.
 

Supra-Man18

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Nov 24, 2007
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Possibly weak coils.. Wen i changed my plugs a few months back they were at .038 !!! and i was Very surprised i had no blowout !? i Went n did some research to find that my coils were in Excellent condition ! check yours out
 
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kamikazemkiii

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Mar 21, 2009
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Supra-Man18;1548418 said:
Possibly weak coils.. Wen i changed my plugs a few months back they were at .038 !!! and i was Very surprised i had no blowout !? i Went n did some research to find that my coils were in Excellent condition ! check yours out

How did you check yours?


92TealSupra;1548335 said:
Any of your coils cracked? Also did you shrink warp them, that can help with these considering their age.

No, Ive looked locally but nobody has heat shrink big enough.

IJ.;1548327 said:
What RPM is the stumble at?

Around 4000+ When your supposed to be in boost, How much hp does the stock fuel system support?
 

tissimo

Stock is boring :(
Apr 5, 2005
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kamikazemkiii;1548423 said:
Around 4000+ When your supposed to be in boost, How much hp does the stock fuel system support?
lol, ~380whp maxed, but if you haven't checked you could be going lean.

I'd say bad coils are the most likely problem though.
 

te72

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Mar 26, 2006
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You might do what I did and go with BKR5E, gapped at ~.028. Did that, fixed my stumbling issue after installing y-pipe completely. :)
 

TripleC

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Dec 2, 2009
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te72;1549874 said:
You might do what I did and go with BKR5E, gapped at ~.028. Did that, fixed my stumbling issue after installing y-pipe completely. :)

I second this suggestion, Regap to .028 that is what i did and it cured the problem
 

kamikazemkiii

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Mar 21, 2009
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I tried adding more fuel and still breaking up, wish their was a dyno that was near that i could hop on and see wassup with the fuel pressre when i get into boost. IJ you said the TT fuel pumps have a 60psi relief valve?
 

IJ.

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Mar 30, 2005
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kamikazemkiii;1550281 said:
I tried adding more fuel and still breaking up, wish their was a dyno that was near that i could hop on and see wassup with the fuel pressre when i get into boost. IJ you said the TT fuel pumps have a 60psi relief valve?

That they do!

Ummm the lines "should" be clean if the car has always had a Filter in the stock location.