two toned spark plugs?.... wtf?

[K15 Blazer]

So I finally tuned up the motor and changed all my plugs.... and every single plug was half brown and half white....
No codes or drivability issues at all but I do notice a rich smell even after warm-up.... very strange.

Heat range? Manifold design?
Wtf is this?

 

[SAATR]

If you're talking about the insulator on the electrode, then that would be a function of the heat range. The brown portion isn't getting as hot as the white. Rich mixture could be a culprit.

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[K15 Blazer]

I thought so too, but having the perfect color on one side and white on the other side could simply indicate fuel exposure.....

Im afraid if I move to a hotter plug, either the computer will correct with MORE gas ooooor.... I could be inviting octane ping/ detonation....
And if I go colder the plug might just foul black....

Cant tune TBI.....

 

[SAATR]

I thought you meant you were getting different colors down the length of the insulator. Side to side is odd. Could be related to your fuel though. Some additives will create coloration of the plugs. Do you usually get your fuel from the same place? May be worth trying a different heat range plug for a few hundred miles and checking them. They are pretty cheap, but it really depends on whether or not it's an issue to you.

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[K15 Blazer]

Well with socialist CA charging over $4 for regular and the smell of rich exhaust.... yeah. I like knowing my engine is running perfect.
I need help finding part numbers though for a hotter plug

 

[Horns]

A picture would help greatly here.

 

[woody31]

try getting some plug indexing washers,,easy to do and cheap horse power,,and it should take care od your issue as well,,

 

[great white]

try getting some plug indexing washers,,easy to do and cheap horse power,,and it should take care od your issue as well,,

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[great white]

Need a picture to see what you're talking about but a white insulator indicates one of two things: lean mixture or too hot a plug.

If it looks like this:

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it's just a healthy plug that's got a lot of miles on it...

 

[woody31]

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dont be a smart ass ,,g w ,, i know what im talking about here,,it aint a diesel ya know,,,