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I live here in AZ. In the summer (9 months of the year) we have low humidity and high temps. My 95 Toyota PU would start pinging when it got over 90 and less then 20% humidity. So I thought - add humidity! So I strapped on old plastic soda bottle to dash, put a small irigation hose and a dripper on top of the air intake filter. Now I just carry a 2 liter bottle of water and fill up the small bottle on the dash every 20-30 minutes.
It stops the pinging on hot dry days. It's not a water injector but it helps my truck here in the desert. A "swamp cooler" for my air intake.
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