white spark plugs
06-15-2021, 01:54 AM
#1
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white spark plugs
Hey guys so I have a 2004 MSM and I changed the spark plugs and when I looked at it its white/ashy. I know people will say I'm running lean, but when I'm driving and checking my AFR the ratio I'm getting is between 10.5-11.6 and I know that's pretty rich so, now I'm in a pickled on what's going on. wondering if someone can help me? the spark plugs were an NGK BKR7EIX-11iridium.
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06-15-2021, 03:40 AM
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Ye Olde' Hayes Manual guide to reading sparkplugs is outdated. It was codified back when carbureted cars roamed the earth.
It's still useful, and reading plugs is still valid - but any plugs with miles on them are going to be white from cruise due to leaner fuel saving AFR's and fuel additives.
Nowadays, you can only realistically read a fresh plug - One that's only got a few minutes of runtime on it (or a single pass down a dragstrip). You can read old plugs but only looking for differences between them "this one is darker than the others" and scanning the porcelain for specs (detonation).
It's still useful, and reading plugs is still valid - but any plugs with miles on them are going to be white from cruise due to leaner fuel saving AFR's and fuel additives.
Nowadays, you can only realistically read a fresh plug - One that's only got a few minutes of runtime on it (or a single pass down a dragstrip). You can read old plugs but only looking for differences between them "this one is darker than the others" and scanning the porcelain for specs (detonation).
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