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Old 05-09-2013, 08:32 AM   #6

40years's Avatar
Drives: 2016 CAMARO 1SS Hyper Blue Met.
Join Date: Jul 2009
Location: Tucson, Arizona
Posts: 1,594
Happens to me every morning and every afternoon when I leave work. Always at the same traffic signal. Has to do with the EVAP system and fuel pump. 5 knocks every time. Nothing to worry about, it's normal.
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