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Plug color half and half....

Lang

Member
hi everybody, quick question.... my front spark plug was half too rich and half just getting some color but very little. i never saw a plug that was half and half. i thought maybe manifold leak but i tried all the tests and did not find one. anyone ever seen this? or did i discover something new. thanks
 
I have seen the 1/2 plug coloring also. A big portion of that is caused by the E10 fuels of today. You just can't read plugs anymore like we use too. I have changed the air/fuel ratio by 2 FULL ratio points and saw next to nothing in color change of the plugs.

I know for a fact my engine is running right on the money but yet the plugs "indicate" my mixture is lean. And believe me it is Not. I no longer see those nice brown/tan plug colors anymore.
 
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