Muffler Knocking - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 03-29-2010, 10:07 PM Thread Starter
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Question Muffler Knocking

2009 SS Here is the problem at a stop light my muffler knocks like someone is in the trunk.....Only when idling at the stop light

Was there a problem with SS mufflers too ? Any help or suggestions ?
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post #2 of 4 (permalink) Old 03-30-2010, 03:14 AM
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Does it knock three times ?
If so its not the muffler,
it would be the evap purge system.
perfectly normal on these cars.

07 G5 GT

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post #3 of 4 (permalink) Old 03-30-2010, 05:43 PM
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That hooker in the trunk isn't dead.



But seriously, probably Evap purge like Cherry suggests.


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post #4 of 4 (permalink) Old 05-07-2010, 02:12 PM
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i have a ls 2.2 it does the same thing.
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