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Vehicle: 1994 D21 KA24E 4x4 with 170k miles....

So i'm reinstalling a new exhaust manifold and decided to take a peak at the exhaust valves while i'm cleaning the exhaust ports...I was suprised to see that the #1 and #3 cylinder's valves were black while the #2 and #4 cylinder's valves were white...

Is there something wrong with my engine or is there something about the way these engines work that i'm not aware of. I always thought black meant rich and white mean lean. How could each cylinder be receiving a different mixture? Why is it happening in pairs?

Cylinder #1


Cylinder #2


Cylinder #3


Cylinder #4
 

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The blackening indicates possible oil burning due to worn valve stem seals.
 
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