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Spark plug analysis

  • Cookie21
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11 May 2019 18:45 #29529 by Cookie21
Spark plug analysis was created by Cookie21
How would you interpret this discoloration of a single spark plug
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11 May 2019 19:05 #29532 by jreardon
Replied by jreardon on topic Spark plug analysis
I have never touched a spark plug before but that looks like rust on the left. Does it feel like rust?

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11 May 2019 19:08 #29533 by Cookie21
Replied by Cookie21 on topic Spark plug analysis
Yes it was more rusty than this but i kinda wiped it down not planning on posting a picture of it

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11 May 2019 19:09 #29534 by jreardon
Replied by jreardon on topic Spark plug analysis
Put one rusty spark plug in, leave rest out, and watch the coolant for bubbling during cranking.
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12 May 2019 06:18 #29552 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Spark plug analysis
Red-Orange OAT coolant leaking into the combustion chamber discolours the spark plug and combustion chamber

"There's always a catch ---- Catch OBD2 ."


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  • Tyler
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12 May 2019 12:16 #29562 by Tyler
Replied by Tyler on topic Spark plug analysis
Agree with the coolant suggestions. Are you chasing some kind of misfire or overheating issue?

I've also seen fuel additives make plugs that color, but they also discolor all the plugs evenly.

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