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Hey guys I have a 2001 9-3 with a tuned B204.5R. I pulled the spark plugs and noticed the gaping was less than stock on all of them. Is this a sign that I melted them? should I be checking the pistons now?
 

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Tuned cars typically run a slightly tighter plug gap than stock to prevent misfires anyway. If the engine runs fine, your pistons are likely fine as well.
 

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How tuned? HP? Like Josh said, .9mm is the usual preferred gap for most of us. Stock is 1.0 or 1.1.

I'd guess your pistons are fine, but run a compression test with a hot engine if you have concerns. Wet/dry. FWIW - unless you're running very high HP, the pistons are usually fine. A bad MAF can burn them or the valve though... so it might be worth replacing it if you never have - especially with a tune.
 

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Always compression test and smoke test first . If compression is not good and equal across the cylinders then do a leak down to establish where the issue is , valves or pistons. . Smoke test for leaks. If good on all fronts diagnose further. The spark plugs center porcelain will show silver specs under a magnifying glass and / or the ground electrode will be closed up or gone missing. Hope for the best
 
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