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So, I pulled the spark plugs today to check to see how the engine is running. After pulling all 6 spark plugs, I've noticed there is a white deposit caked onto the spark plugs. I doubt this is normal operation, if anything this should indicate that the engine is running a bit off? But other than this, The car runs and drives fine, even under WOT, no indication of any issue or running rough.

We replaced the catalytic converters this week as well, The cats have white deposits on them as well, not sure what this is but i definitely don't want it to happen again to these new cats.

Spark Plugs

James Vargan
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1 Answers1

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Depending on the mileage on these plugs, I'd suggest there's absolutely nothing wrong with the way your engine is running. These plugs look to be in great shape. The small amount of deposits on the sides of some of the plugs wouldn't worry me at all. (NOTE: There is a decent chart on reading spark plugs I posted in this answer which may be useful to you.) The light tan deposits are quite common in an engine which is running just fine. They will build up over time, but are not a huge issue and one of the reasons you change plugs as a maintenance item.

Pᴀᴜʟsᴛᴇʀ2
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