# Spark plugs blackened

**URL:** <https://community.cartalk.com/t/spark-plugs-blackened/132376>\
**Category:** Maintenance/Repairs\
**Tags:** toyota\
**Created:** [January 10, 2019, 4:04pm UTC](https://community.cartalk.com/t/spark-plugs-blackened/132376 "2019-01-10T16:04:30Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![donnaeastman](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@donnaeastman](https://community.cartalk.com/u/donnaeastman)\
**Post date:** [January 15, 2019, 11:19am UTC](https://community.cartalk.com/t/spark-plugs-blackened/132376/21 "2019-01-15T11:19:25Z")

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f the gauge has a lot of room to wiggle around, your old **plug** may have worn down its center electrode, **causing** a gap that’s too large. … **Black** , dry, fluffy **soot** on insulator tip and electrodes. Overly rich fuel/air mixture, dirty air filter, too much. driving at low speeds, or idling for a long time.

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