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  1. #21
    Marty Jackson
    Saab Addict Finding41's Avatar
    Join Date
    17 May 2013
    Location
    London Ont. Canada
    Posts
    641
    Saab(s)
    Sadly a Volvo XC90
    Could the cat be plugged?

  2. #22
    Kenny
    Saab Fan
    Join Date
    30 Dec 2013
    Location
    Lawrence
    Posts
    41
    Saab(s)
    2005 SAAB 9-5 Aero MT
    Hmmm - this sound like a issue I have with a 01 SAAB 9-5 SE V6 -

    I was getting no boost (lag or no power from turbo) The issue ended up being the Brake booster. Since the car has a remarkably quiet cabin I didn't notice the light hissing. You wouldn't here it even if you shut off the radio and the A/C blower. The seal front the inside of the pump at the end of the Brake pedal was leaking. Replaced Brake Booster - changed spark plugs (second change with in 4 months)....full Power restored....

    My theory is that if you have lack or power (from lack of boost)
    It could be the following:
    1. Turbo Failure -
    2. ECU - boost controller
    3. Vacuum Leak
    4 Turbo Inter cooler air leak (Do a Pressure test) Check hoses
    5. Turbo flange that connects the Intake pipe to the turbo - (make sure that is tightly secure)


    You really need to check you vacuum pressure and make sure its holding well under load (while driving)

    BTW - Does the needle for the Boost gauge only get to almost the middle of the yellow? If it does that is a indication of loss of vacuum pressure.
    SAAB
    Keep Calm my friends
    and Apply BOOST

  3. #23
    Luis R
    Saab Enthusiast saab95er's Avatar
    Join Date
    24 Sep 2012
    Location
    Vineland, N.J.
    Posts
    52
    Saab(s)
    03' 9-5 Linear wagon
    So did you find the issue? We all would like to know what you found.

  4. #24
    Saab Fan
    Join Date
    11 Jan 2014
    Location
    Edmonton, Alberta, Canada
    Posts
    42
    Saab(s)
    2000 9-5 Aero, 2002 9-5 wagon, 2007 9-3 Aero, '93 9000 CSE, 7 vintage Saabs
    Sounds like your problem is way beyond your capabilities to properly diagnose. That's why the offer came from a competent Saab technician.

    Low boost, or baseline boost, is a symptom of boost control...seeing as you've ruled out a plugged cat, etc. If you've scanned your car with a generic OBD2 scanner I can attest to the fact that generic scanners OFTEN miss codes that would be displayed with the factory tool. Generics either miss completely or display random erroneous codes.

    Mark

  5. #25
    Saab Fan
    Join Date
    20 Oct 2013
    Location
    CA, USA
    Posts
    17
    Saab(s)
    2003 Saab 95 arc 3.0
    Vacuum leak test in order. Go on Youtube.com to learn how to. Listen to hissing sound, locate the prob. Today, I fixed mine. The double O-rings on the sensor on black plastic in-take pipe were slightly sliced. cold air was being sucked in at the sensor. Sending wrong message for rich fuel/air. After replacing o-rongs, pulled fuse for ECU #17 for 15 minutes on my 2003 9-5 arc V6. It improved a lot. Gas mileage improved.

 

 

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