Lean condition at Idle after installing Perrin AOS, 04 STI

Discussion in 'Modifications And Maintenance' started by Tim Colston Jr, Jun 9, 2019.

  1. Tim Colston Jr
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    Tim Colston Jr Member

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    Just installed a Perrin AOS. Went smoothly for the most part. Runs decent under load on test drive. Idle is a little off. Runs lean at idle. Disconnected battery for idle relearn and after second start up have CEL w/ flashing CC. Don’t have time to have scanned today. Curious if anyone else has had this problem after AOS install and if there are any recommendations? Makes me want to just take it back off but the oil in the intake is driving me crazy. Thanks in advance.
     
  2. joebush44
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    joebush44 Well-Known Member

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    Go back over all of your vacuum lines as you may have forgotten to hook one up...sounds like you have a large vac leak. CEL code would be helpful
     

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