Keith Heberling Posted August 27, 2010 Report Share Posted August 27, 2010 (edited) Car is a 1963 Avanti, R1 automatic, fully restored in early nineties, driven occasionally. Pinging problem has developed over last year or so. Plugs are correct and proper burn. Replaced Carter with new Edelbrock which was set up correctly. Valves were set to spec. Replaced Prestolite distributor with new Mallory electronic, the oil pressure vacuum is good. Problem is this, I cannot find the sweet spot in setting the timing. If I advance the timing the pinging is worse, I have retarded the timing as far as possible until engine runs rough and some pinging still there. There is no in between. Use premium gas with and without octane booster. None of these changes have made a difference at all. . One clue that may be helpful here – when engine is cold there is no pinging, when engine temp reaches 180 degrees, it begins to ping when accelerating during cruising speed. It gets increasingly worse as it tops out at 205 degrees. Sound is a pinging/chatter, like valves are floating when accelerating. Frustrated and could use some help in figuring out this problem. Thanks. Edited August 27, 2010 by Keith Heberling Link to comment Share on other sites More sharing options...
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