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most likey depending on the miles on this engine,it may be the timing chain is worn some ,so this would keep the timing to line up to a perfect mark,or zero,or the scan tool may be off,needing calibated!

2009-06-18 05:29:43
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Q: Why on a 1996 Tahoe 5.7L engine at TDC and rotor pointing to number 1 post in distributor I cannot get ignition advance set to zero using auto scanner tool?
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