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I had to pull timing on my 95 ex when changing the plugs, new plugs caused audible detonation. I set it at factory spec. My thought on the whole thing is that advancing timing can cause detonation, fix this by increased octane, does increased timing pay off in a % increase to cover the cost in fuel? As far as the jumper thing in Honda's the intention is the keep the computer from adjusting timing as the vehicle warms up and as rpm's change. Some on other sites say it isn't needed, but takes another 30 seconds to perform.
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