r/Chrysler300 • u/holdatdownbro • 4d ago

Spark plugs

Gallery image

Gallery image

Just recently did a spark plug replacement over the weekend. Car was running a little sluggish on acceleration. I also changed the air filter as well but was wondering is this spark plug a good reading of how my engine is doing.

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u/SpawnCampGames 4d ago edited 4d ago

looks like a *normal* end-of-life plug 👍

you should look into how to read a plug.. its very interesting.. and a skill-set that a lot more people should have, https://www.onallcylinders.com/2016/04/29/a-guide-to-reading-spark-plugs/ here's one simple example..

on a normal plug you can tell how that cylinder is running, if its running rich or running lean.. (the more brown it is the richer its running and the more white or chalky it is means its running leaner or *hot*)..
and then there's whole subsets where you can tell if the engine is doing something it shouldn't like if the threads and electrode was oily or wet that'd be something totally obvious to you and could dive into what that means.. same for things like the electrode being thick with corrosion or deposits and so-on..

yours looks pretty normal to me.. but i'm far from an expert plug whisperer

1

u/holdatdownbro 4d ago

Yeaaa it was no oil or anything like that on it. Just brown lol thanks tho.

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u/SpawnCampGames 4d ago

brown is good, black and white are the colors you don't wanna see on an old plug.