09-26-2013, 09:29 PM | #1 |
Drives: 2010 Camaro inferno orange 2LT RS Join Date: May 2013
Location: ONTARIO
Posts: 30
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Why exhaust sound deep during cold start?
As question title says , why does it happen? I just put on NPP and first time when i started it, I was amazed by the deep sound but then it went little quite.
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09-26-2013, 09:59 PM | #2 |
Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009
Location: Jefferson City, Missouri
Posts: 13,943
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On cold startup, the car runs the rpms a bit higher than normal idle and I also believe it purposely runs a bit rich. This is to help heat up the catalytic converters quicker....so basically it is strictly for emissions purposes. After 30 seconds or so, it idles normally.
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2010 Camaro 1LT V6 (Sold. I will miss her!) |
09-27-2013, 08:27 AM | #3 |
Drives: 2010 Camaro inferno orange 2LT RS Join Date: May 2013
Location: ONTARIO
Posts: 30
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There should be a way to make car perform cold start every time. Or run it little rich under 1000 rpm
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09-27-2013, 08:56 AM | #4 |
Drives: 2010 ZL575 Camaro 2SS/RS Join Date: Aug 2012
Location: Saskatchewan
Posts: 23
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That sound at startup is invigorating.
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09-27-2013, 09:09 AM | #5 |
7 year Cancer Survivor!
Drives: 17 Cruze RS, 07 G6 GT, 99 Astro Join Date: Dec 2007
Location: East Tennessee
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It has always done that, but it was less noticeable with the stock exhaust. Both my 2010 and 2012 have always done it. It's just the cold start mode, sort of like what carbureted engines had with an automatic choke. It makes a cold engine easier to start.
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