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Answered 2016-12-18 04:46:48

It COULD BE the electronic ignition computer. On engine startup several sensors provide information which the computer uses to to reset ignition timing [slightly retarded] for a cranking speed well below idle, to set the fuel mixture temporarily to rich, and probably some other things I can't think of right now. Any time the fuel mixture is over rich, the knocking tends to increase. It seems that one or more of the start mode adjustments is just slightly out of specification. Not far enough to prevent the engine from starting, but just far enough to allow "pre-ignition," resulting in a few "knocks," until the engine RPM comes up, and the computer has more data with which to work, and the mixture is leaned out for fuel economy and polllution reduction.

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