Hi Eric,
Good question. There will be traces of aluminum particles on the spark plug's porcelain insulator (near the tip). DC says that this pinging doesn't hurt the engine. I beg to differ.
-Mitch
> From: "eric hufstedler" <huff@101freeway.com>
> Subject: Re: DML: To ping, or not to ping and rear brakes......
>
> >Others have had success changing to a 180 degree thermostat.
> >When I changed out my spark plugs, I found that #4 was the one pinging the worse.
> >
> What does the plug look like after lotsa pinging?
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