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Old 07-13-2009, 02:15 AM   #18
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Drives: 2012 Silverado LTZ, 2010 2SS/RS
Join Date: Nov 2008
Location: Saskatoon, Saskatchewan Canada
Posts: 2,764
If you hear it from the rear of your car and it sounds like someone knocking on a door, it is your fuel system pressurizing.

Helps fuel ecomomy and blah blah blah. There was a thread about it a while back.

You say it sounds like the noise comes from the rear, and last time I checked, the pistons were in the front.

EDIT: Here's the thread:

Read post #11, it's from the Fbodfather himself

Originally Posted by fbodfather View Post
.........we are far from finished.................
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