Old Jan 14, 2007 | 12:23 PM
  #2  
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HatchVX
Driving a Turbo 2L Terror
 
Joined: May 2002
Posts: 4,212
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From: Stafford, VA
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It helps with keep the pressure the same while at idle. It will adjust the idle if the pressure drops. If it is broken or is disconnected you can have a rolling idle problem.
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