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Old 09-11-2017, 01:44 PM   #1
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Join Date: Apr 2014
Location: Chicago
Posts: 95
Can the AOS vent line cause vacuum leak?

Title says it all - trying to troubleshoot a vacuum leak in a '97. Newish AOS that is functioning fine (I know it is not the problem) could the AOS vent line that connects the top of the AOS to the intake / throttle body, if not properly sealed, cause a vacuum leak at low speed that would trigger a CEL? Could it happen due to an ill fitting o ring on the end of the vent line?

Thx-
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