2005 Outback Low Idle Issue

Discussion in 'Modifications And Maintenance' started by Lucasoil4u, Mar 28, 2019.

  1. Lucasoil4u
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    Lucasoil4u Member

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    2005 Outback fighting a random low idle. Does it 2 times when driving it 8 times. It will idle at 450rpm or so . I have also noticed that it is not very responsive off of idle. It will almost pause a little when you rev it up. Things I have checked or done.
    -Maf Sensor (oem)
    -coil, plugs, wires
    -Cleaned Throttle Plate (reset idle)
    - PCV Valve
    -Checked Exhaust Back pressure
    -Cleaned EGR
    -Injector balance Test , Ohmed Injectors (passed)
    -Fuel Trims are negative when I look on the scan tool.

    There are no codes in the system . Its random when it does it. You can drive it for multiple days without issues before theres an issue. Head gaskets were done 10k miles ago. with timing belt and stuff.

    Just need some insight on where to look or what to test. Getting stressed out over this issue.

    Thanks
     
  2. Chux
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    Chux Well-Known Member

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    4 cylinder? I assume

    I don't remember when the change happened, is that drive-by-wire? Or does it have a cable throttle?
     
  3. Lucasoil4u
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    Lucasoil4u Member

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    It’s drive by wire . I cleaned the throttle body again and it’s ALOT better . It hasn’t idled as low since .
     
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  4. Lucasoil4u
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    Lucasoil4u Member

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    So it did it again . It idles low and isn’t responsive to pedal input takes a few seconds when hitting the gas before it revs up . I feel like the throttle body itself is going bad . What do you guys think ?
     
  5. Krazylegz1485
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    Krazylegz1485 Well-Known Member

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    Is there a throttle position sensor on these? Total guess here.
     
  6. pillboy
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    pillboy Well-Known Member

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    Idle air control valve? I would say a guess, but the total has been used already.
     
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  7. phi11
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    phi11 Well-Known Member

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    How many miles?

    <=== 2005 Outback owner, 230k

    I’m cleaning this throttlebody 2-3 times a year, really.
     
  8. pillboy
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    pillboy Well-Known Member

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    Really? I didn't clean the one on my 2005 Legacy GT in 71k (the 10 years that I owned it).
     
  9. Lucasoil4u
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    Lucasoil4u Member

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    2005 outback 161k . I looked at the throttle body connector and its idling better than ever after plugging it back in . I will see how it treats me this week. Maybe its time to buy that truck I've been looking at.
     
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  10. Chux
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    Chux Well-Known Member

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    DBW means sensor is built into the pedal, and idle is actuated by the motor in the throttle body. Those would be my concerns in this case. I've never owned one (not an accident...), so I'm not acutely familiar, but there's got to be a testing procedure.
     
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  11. Lucasoil4u
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    Lucasoil4u Member

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    So Should I do a throttle body and let it relearn idle ? I would get a used one cause new ones are stupid expensive
     
  12. Chux
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    Chux Well-Known Member

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    There's got to be a testing procedure, and I imagine it's been documented umpteen times. Don't just throw parts at it.
     
  13. Lucasoil4u
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    Lucasoil4u Member

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    Where do I find said testing procedure. I have access to alldata and Identifix
    Ive looked but havent found anything on there
     
  14. tangledupinblu
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    tangledupinblu Event Coordinator Staff Member

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    @Todd ?
     
  15. Todd
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    Todd The Originator Staff Member

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    Random low idle with no obvious cause... that sucks.

    Best Wild A$$ Guess: Automatic transmission? Is the torque converter clutch dragging? When it idles low, toss it into neutral, does it recover?

    Suggestion. Get an OBDII "flight Recorder" to capture data when it happens. I'm most curious about the throttle position.
     
  16. Lucasoil4u
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    Lucasoil4u Member

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    I have put it in neutral and it doesn’t change . Still low idle . I’m gonna scope the throttle position this weekend to see what I come up with . What should it have of throttle position at idle ?
     
  17. Lucasoil4u
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    Lucasoil4u Member

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    How do I upload a video from my cell phone of video of the scan tool data
     
  18. Lucasoil4u
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    Lucasoil4u Member

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    Nevermind. It was a sticky EGR valve. Got a new one on order but for now im driving around with it unplugged.
     
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  19. Todd
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    Todd The Originator Staff Member

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    Ahh, the clue would have been the STFT (short term fuel trim) would go way (>-20) negative during the condition.
     
  20. Liftedsubieskato
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    Liftedsubieskato New Member

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    Being a former vw owner i found that if my vw did that i could unplug the maf sensor and it would run better,next time it starts to act up unplug it and see if it works better, and if it does than get a new maf
     

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