Which Spark Plug To Check - Team Camaro Tech
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post #1 of 3 (permalink) Old Oct 8th, 18, 03:47 PM Thread Starter
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Which Spark Plug To Check

I remember back in the day we used to check a certain spark plug to get an idea if a car is running rich or lean. I guess I must be getting old as I don't remember which plug to pull. Can someone remind an old guy which plug to check? Thanks!

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post #2 of 3 (permalink) Old Oct 8th, 18, 04:05 PM
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Re: Which Spark Plug To Check

All of them. This is because fuel distribution is uneven in the manifold. This is especially true if you have a BBC with good and bad ports.

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post #3 of 3 (permalink) Old Oct 8th, 18, 04:12 PM
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Re: Which Spark Plug To Check

Ditto all. Depending on the manifold don't be surprised if you have to stager jet the prim.

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