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  1. #1
    Saab Fan CalLook67's Avatar
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    06 Apr 2021
    Location
    Fort Collins, Colorado, USA
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    20
    Saab(s)
    2006 9-5 SportCombi 2.3t
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    Low Boost

    So sometime in the last few weeks, my '06 US 9-5 has lost a fairly significant amount of boost at WOT, and I'm at a bit of a loss as to where I should start looking for solutions. I don't know exactly when it started as I don't have a commute that really allows me much time at full throttle, but today I noticed that the turbo gauge only shows about 2/3rds between neutral pressure and full boost at WOT and the car definitely doesn't accelerate as hard as it used to. There hasn't been a Check Engine light, there are no weird noises on boost or otherwise, and the car seems to be running totally normally other than at full throttle. A quick glance-over didn't show anything super abnormal, but it was hot and I didn't feel like poking around a warm turbo this afternoon, so maybe tomorrow I'll ride my bike and check the car out after work, but in the meantime I'd love any kind of directions as to where I should look.

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  2. #2
    Saab Fan CalLook67's Avatar
    Join Date
    06 Apr 2021
    Location
    Fort Collins, Colorado, USA
    Posts
    20
    Saab(s)
    2006 9-5 SportCombi 2.3t
    Thumbs Up:   0
    So after a few days of researching online, I tried cleaning my MAF sensor and that immediately worked. There was nothing loose, nothing off, it just wouldn't boost as much as usual, and a quick clean of the MAF did the trick.

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  3. #3
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
    Location
    near Seattle, Washington
    Posts
    1,477
    Saab(s)
    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
    Thumbs Up:   32
    I fixed a BMW X3 (E83) that had a check engine light on. Spraying the MAF with cleaner made the light go away. It didn't go off immediately but after about 25 starts over many days.

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