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Old 09-19-2019, 11:34 PM   #12 (permalink)
It's all about Diesel
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Originally Posted by MeteorGray View Post
I can't prove the Italians know what they are doing, but I "think" the technique helps keep the spark plugs and valves a little cleaner than they otherwise would be. The use of good quality gasoline which contain the proper cleaning additives also helps, I "think."
Not sure about the effectiveness of the "Italian tune-up", but in light aircraft still fitted with piston engines it's not unusual to lean the mixture for a while in order to increase the temperature in order to eliminate lead fouling around the spark plugs' electrodes. But anyway, at least in a port-injection engine, I wouldn't expect too much carbon buildup around the valve seats, even though in newer cars with direct injection the fine particulate matter emissions have increased to Diesel-like levels.
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