Loss of compression?
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This is a discussion on Loss of compression? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi all, I own a 2003 WRX and have recently noticed a reduction in power and what appears to be ...

  1. #1
    Registered User
    Join Date
    Sep 2008
    North Carolina

    Loss of compression?

    Hi all,

    I own a 2003 WRX and have recently noticed a reduction in power and what appears to be a loss (but not a total loss) of compression. My turbo gauge is just not moving under load the way it use to.

    I have a UTEC TurboXS racing ECU, and a laptop mounted in the car. When I test drive it, the UTEC reports back my max compression after every pull. the laptop consistently shows an average of 13 - 14 pounds of boost.

    the car idles fine, sounds fine, and otherwise runs great. Only 34k miles. Any ideas how to troubleshoot or things to look out for? could it simply be time for new spark plugs?

    Other mods to the car:

    Borla Header, cat-less up/down pipes, borla mid-back axhaust, cold air intake, bigger BOV, and the UTEC TurboXS ECU

    any advice would be appreciated...

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  3. #2
    Registered User 06scoobyrex's Avatar
    Join Date
    Feb 2010
    Well the only real way to tell if you lost compression is a compression test, but before you go and do that there are loads of more questions...

    1. Any check engine light codes?

    2.Are you hitting target boost outlined in your MAP notes?

    3.What map are you useing and what mods are listed in the notes to use THAT map?

    4.Do Your current mods match exactly what mods are listed in the MAP notes?

    5.Things like your CAI and BOV have been known to mess up your A/F scaling and you could be running rich or lean both are bad for your car...

    6.Headers on these cars are pretty much pointless, unless your highly modified...

    7.Are there anyother symptoms other then It feels slower, or your "average boost" is only 13-14?
    Hawk-Eye Alliance #801
    The Impreza "this was repaired/replaced at what mileage" database (Please Contribute)

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