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Here in Tucson right now we have 4-8% humidity and over 100F). My Toyota starts pinging at 95F with this humidity. I've taken a small plastic soda bottle and strapped it to the stearing column. Then run a drip irrigation hose from the bottom into the top of the air filter. (Gravity fed - Engine side of filter). Here is put a dripper set to drip about two drops a second. So after a minute or two my filter element is wet and I'm getting cooler and moister air into the engine and my pinging problem has gone away.
It's a Swamp Cooler for my air intake.
Might not work if you already have >50% humidity. But here in the desert increasing the humidty from 4% to something approaching 50% keeps me from having to run Premium fuel in the summer.
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