Reading Plugs

[Len Sabatine]

    Normal Spark Plug "Read" procedure;  Full Power WOT. then cut clean[off]
    Don't allow engine to idle, or the "read" is junk info.
    Yes , make a full pass in executing the test.
    Here we go again; Specific spark plug designs / heat ranges have different
    time durations in which they color accurately . Different fuel branding 
and
    "brews" also color differently and @ different  rates. Best advise , 
duplicate
    test environment by running on the same course , using the same fuel and
    spark plugs. Start with OE combos and adjust from there.
    Pay attention to the weather conditions as well. Always adjust
    Fueling and Spark for "Rich Best Power" . It will save you from a melt 
down ,
    Unless you happen to have deep pockets and lots of time to waste.
    Len

>semi related to this thread...
>
>What is the *best* procedure for getting the proper plug readings at a
>particular throttle position?
>Do you run the vehicle on a light load? heavy load?  Are you supposed to
>just kill the motor in the middle of a "run" and coast to stop?  Is it ok to
>idle to a stop and shut the motor off?  How long should you operate in your
>target range before the plug color becomes accurate?  Any concerns with
>overheating after a WOT run?
>
>I've seen a few sites like Tim pointed out that had pictures of sample plugs
>but not the correct way to actually tune an engine by reading plugs across
>the entire operating range.  Is there a FAQ somewhere on how to obtain
>repeatable, consistent results?
>
>TIA,
>-Tim-
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