Spark plug diagnosis? (1 Viewer)

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woytovich

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Plugs pulled from my 40 today. (and replaced)
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IMHO they don’t look all that bad ... considering your cap is crusty and probably not firing the plugs well

2 and 6 look a bit worse than the others maybe the rich because of the cap

When was the last time you cleaned them and cleaned the cap and rotor?

Was it missing ?
 
The posts in the dist cap look like aluminum?
In my opinion brass is better than aluminum.
Is it stock ignition or electronic?
The plugs don't look to bad from what I see.
A little carbon on a couple but have seen worse that still worked.
Many auto manuals have color pictures of spark plugs and explanations for the various conditions.
 

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