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  1. #1
    Saab Enthusiast Kazamario's Avatar
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    07 Jun 2013
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    Wausau, WI
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    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch

    2004 Aero 9-5 low boost :(

    I love my Aero but she isnt boosting.
    220k, idk if original block or whatnot.

    Here's what I've done to her (Rosalita):

    Good DIC
    New laser -10 NGK Laser Plat plugs.
    Cleaned MAF
    New o2 sensors
    Bolt Mod
    Disconnected Wastegate from BPC - no change in boost
    Replaced BPC
    REplaced evap hose off King Cobra
    Checked Wastegate arm - moves properly, I have an 02 9-3 to compare wastegates to

    What I think I need to do:
    Replace fuel pump
    Replace fuel filter
    Replace fuel pressure regulator
    Test Injectors - Idk how to do that
    Maybe replace MAF
    Smoke/Vaccum test

    Any information would be extremely helpful!
    I've read several threads on this issue, but there's so many variables with low boost, that I could end up spending a bunch of money on parts that don't solve the issue.
    Therefore, I thought I'd ask publicly.

    Thank you for your time,

    Mario

  2. #2
    Frank
    Administrator nordwulf's Avatar
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    30 Jul 2010
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    Saab(s)
    previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
    Quote Originally Posted by Kazamario View Post
    I love my Aero but she isnt boosting.
    Please explain what you mean with "isn't boosting". What is or isn't happening?

  3. #3
    Saab Enthusiast Kazamario's Avatar
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    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    Sir,

    Apologies for not being clear, the boost gauge only goes into to the yellow, no matter what I do.
    I've tried all the things mentioned above, with no success.

    - M

    EDIT: The boost gauge barely goes into the yellow, not midway, not toward the red.
    Last edited by Kazamario; 26 October 2016 at 18:19.

  4. #4
    Saab Enthusiast Kazamario's Avatar
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    07 Jun 2013
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    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    @nordwulf

    I'm ordering this https://www.eeuroparts.com/Parts/107...alve-55562854/.
    Are there any other usual suspects that I can replace on the cheap that might help rectify my low boost issue?

  5. #5
    Saab Enthusiast Kazamario's Avatar
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    07 Jun 2013
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    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    Replaced the fuel pump, replaced fuel filter, boost hits mid yellow now, but nowhere near what it used to be. Anyone have any other suggestions on what may be causing my low boost symptoms?

  6. #6
    Bruno
    Saab Addict swisssaabist's Avatar
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    18 Nov 2016
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    Saab(s)
    9-5 ARC Wagon 2002 2 t auto engine B205E
    without any codes this not so easy to do.Do you have access to a Tech II ? it is very helpful (maybe a code reader OBDE is enough for reading )but you have another valves to check like that

  7. #7
    Saab Owner Digger's Avatar
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    28 Oct 2016
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    Minneapolis Minnesota
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    Saab(s)
    2006 9-3 2.0t SportCombi
    Quote Originally Posted by Kazamario View Post
    @nordwulf

    I'm ordering this https://www.eeuroparts.com/Parts/107...alve-55562854/.
    Are there any other usual suspects that I can replace on the cheap that might help rectify my low boost issue?
    Without a vacuum gage you don't know for sure if you have low vac or a sensor telling a gage that you do, On the cheap it probably costs less to buy a jug of sea foam at Walmart than it does to go to the local auto parts store and buy a vacuum tester, or rent a scan tool that will let you monitor a running engine. You've already looked for vacuum leaks and what you're looking to do is improve vacuum if you can.

    Sucking a jug of sea foam through the manifold vacuum line that usually sucks captured gas and fumes will scrub up the innards of your manifold and it will also clean the carbon from your cylinders. For cleaning carbon this isn't the method I suggest to anyone who has never done anything like this, or even seen it done before, but with U-Tube you can see how it's done and decide if you can do it yourself.

    After you've looked into your gas tank issue, adding Lucas fuel system cleaner to the gas every couple of fills will clean your injectors and keep them clean. If your baffle is rotting and not just knocked out of place when you replaced your pump, don't do this until after you replace your tank.

  8. #8
    Saab Enthusiast Kazamario's Avatar
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    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    @Digger,

    I have the torque app and the portable OBDII Bluetooth tester. What is my vacuum supposed to be on a normal Aero, if you have a benchmark ballpark range, I can compare those as I can see my vacuum in real time.

    I did seafoam it two months ago. I suspect my wastegate or a vacuum leak is the culprit, I have disconnected the exhaust manifold, and drove it hard, still only boosts mid-yellow. I've also read the MAF may be the issue, however Ive cleaned that as well.

    @swiss,
    Thank you for your input, it's appreciated.

    Thanks,

    -M
    Last edited by Kazamario; 10 February 2017 at 01:57.

  9. #9
    Saab Owner Digger's Avatar
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    2006 9-3 2.0t SportCombi
    Thinking that it was better to check the WIS than guess I looked. On start .7 bar minimum if your car has vacuum pump, .4 bar if it doesn't. My preference for a GM 2.3t gas engine at start 1.9 and 1.6 but the book is the book and you go by the book for what is OK.


    Easy to miss a small vac leak with smoke, I use carb cleaner and sometimes a rubber hose off the end of a propane torch tip for getting into places I can't squirt with a can when the engine is hot.

    Did find a service bulletin for low boost / reduced performance caused by faulty bypass diaphragm, or waste gate, or control function along with instructions how to use vacuum pump to cause overpressure to test. Working blind you can chase this down replacing a $50 part here and a $100 part there or you can go online to harborfreight and get some tools to check vac and compression, not shop mechanic quality tools, good enough for the few times you will probably use them. Wouldn't hurt to get the oil pressure test kit too, could come in handy some day.

  10. #10
    Saab Enthusiast Kazamario's Avatar
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    07 Jun 2013
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    Saab(s)
    2006 Saab 9-5, 2004 Saab 9-5 Aero; 2002 9-3 HOT Hatch
    Digger, can you link me to the service bulletin, please?

    What do they mean by "control function"?

    Thank you very much, I appreciate your time!

 

 

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