05 Saab 9-2X Aero P0122 & P0442 codes, misfires and vacuum leak?

Discussion in 'Modifications And Maintenance' started by passenger 57, May 2, 2017.

  1. passenger 57
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    passenger 57 Active Member

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    Hello everyone,

    I have a 2005 Saab 9-2X Areo (mechanically the same as a 05 WRX) with the following mods:

    Blouch 16G Turbo
    Walbro Fuel pump
    DeatschWerks Top Feed 650cc Injectors
    Ebay Top Mount Intercooler
    Manual boost controller
    Gimmick Motorsports Turbo Inlet Hose

    I've had the P0122 & P0442 codes for a while now but the other day the CEL started flashing and the Saabaru started bucking, I was under mild boost, 5lbs or less. As I understand a flashing CEL means it was misfiring. Also my boost gauge has been showing about 14 in/hg of vacuum, which seem a bit low and it started around a week or 2 ago. I bought some 6mm silicone vacuum hose and started replacing lines. I found a broken connection in the rats nest next to the alternator and replaced all of those lines, no joy, still at 14 in/hg and after I cleared the codes, the P0442 & P0122 came back. However, I did not get any misfire codes.

    P0122 is low voltage to throttle position sensor
    P0442 is a small evap leak

    Talked to a mechanic and he recommended an compression & leak down test.........? Is this necessary?

    I put brand new NGK BR6EIX spark plugs in a little over a year ago, on 4/26/16.

    I'm gonna try new plugs, but need a bit of help with the other items, P0442, P0122 & possible vacuum leak. Any help is greatly appreciated
     
  2. passenger 57
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    passenger 57 Active Member

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    Changed plugs yesterday. Still misfiring...
     
  3. project/driven
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    project/driven Well-Known Member

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    Swap coils, see if the misfire follows as the easy check. You're gonna want to do a compression test if the misfire doesn't follow the coil from the previous location
     
  4. passenger 57
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    passenger 57 Active Member

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    Just did a compression test, WOT and the engine was warm, here are the results:

    Cylinder 1 - 140 psi
    Cylinder 2 - 145 psi
    Cylinder 3 - 146 psi
    Cylinder 4 - 150 psi

    Does anyone have a leak down tester?? I would love to use it if possible. Text me if you have one available for use. 612-207-2030

    Thanks

    Kaleb
     
  5. BAASaBOOS
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    BAASaBOOS Well-Known Member

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    My '05 Aero had a P0442 (it's stock) and (Subaru) dealer had to do smoke test to find the evap leak and fix it.
     
  6. FarmR
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    FarmR Active Member

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    i'd tackle the p0122. it might be the main cause.
     

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