2013 sti vacuum issue
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This is a discussion on 2013 sti vacuum issue within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; 2013 sti stg 1 cobb ap aem intake and Gs aos are my mods, Ap and aem intake using ots ...

  1. #1
    Registered User starkall's Avatar
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    2013 sti vacuum issue

    2013 sti stg 1 cobb ap aem intake and Gs aos are my mods, Ap and aem intake using ots 93 map. My boost gauge will only read about -6 vacuum on idle and builds boost very easy with little throttle applied. I just noticed it started doing this recently. I can reach my target boost of 18psi. And the defi boost gauge im using reacts really slow while reading vacuum. It use to be very quick. The ap will only read about -6 to -10 on vacuum while at idle and stays around -1 to -5 vacuum while maintaining a steady speed on the highway. It use to be around -19 at idle and around -15 on the highway. Cant find a vacuum leak either.

    Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

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  3. #2
    Master Baiter EJ257's Avatar
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    How are you checking for leaks?
    2005 WRX STi (Mods | Virtual Dyno)

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  4. #3
    Registered User starkall's Avatar
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    Soapy water is the best I had today

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    Registered User anpato's Avatar
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    If you can get to a smoke test machine use that, if not then check all vacuum lines and throttle body hose.
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    Subaru Newb MainFrame's Avatar
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    Try performing a boost leak test starting pre-MAF.. that should uncover any leaks.

  7. #6
    Registered User starkall's Avatar
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    Found a tiny pin hole in the vacuum line for my boost gauge.

    Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

  8. #7
    Pro Manscaper Mikie13's Avatar
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    That cheeky little bastard! Good find.
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  9. #8
    Registered User starkall's Avatar
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    The ap reads in psi for vacuum though so is about double what it reads in terms to a boost gauge for vacuum.

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