Quote:
Originally Posted by F87source
It's actually not the NGK - to an extent.
From what I have seen it's the gap that causes these misfires, and when they go to a larger gap (generally closer to stock) the misfires go away. These cars don't seem to sensitive to colder plugs, so the NGK's play no part in the issue.
Now here's the caviot, I have heard issues come from the poor QC of the NGK plugs, that's the only time when I see the plug being at fault, and according to AmuroRay QC problems on NGK plugs are way more common than on Bosch plugs.
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There are a ton of counterfeit NGK plugs out there, so I wonder if this is part of the issue as well.