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Thread: 1st thing 1st... Emission failed

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  1. 08-04-2007, 10:55 AM #1
    Bruno's Avatar
    Bruno
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    Default M30 emission failed, updates

    Here are the readings
    Driving:
    HC ppm: 168 (limit: 55)
    CO%: 1.88(limit: 0.31)

    Idle:
    Driving:
    HC ppm: 263 (limit: 200)
    CO%: 2.46 (limit: 1.00)

    Ok, changed the O2 sensor and both cats nd drove 1 hour

    Here are the readings
    Driving:
    HC ppm: 158 (limit: 55)
    CO%: 0.91 (limit: 0.31)

    Idle:
    Driving:
    HC ppm: 357 (limit: 200)
    CO%: 5.58 (limit: 1.00)

    I am guessing that something is wrong with the engine... I will try a compression test and maybe cap and rotor, there is a missfire somewhere.
    Worse case... I will have to pull the engine.
    Last edited by Bruno; 08-08-2007 at 10:10 AM.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars
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  2. 08-04-2007, 11:32 AM #2
    Tiger
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    No cats are expensive if you bought Magnaflow universal equivalent and weld them in.

    Sounds like your timing may be a bit off... AFM... I don't think O2 will bring it down that much... then again, maybe it can. Check the O2 reading... 0.5V is what you are looking for or lower.
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  3. 08-04-2007, 03:37 PM #3
    attack eagle
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    you need to find a "special" inspection station. my cats are now gone since I was having to pay for a special inspection anyway.The tint, headlights, smoked turns,etc are illegal and it was borderline smoggable (passed by 1ppm last year) anyway.
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  4. 08-04-2007, 03:45 PM #4
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    Quote Originally Posted by attack eagle
    you need to find a "special" inspection station. my cats are now gone since I was having to pay for a special inspection anyway.The tint, headlights, smoked turns,etc are illegal and it was borderline smoggable (passed by 1ppm last year) anyway.

    It is different in Canada. I will start with O2 and check for vacuum leaks then if it still fails I will get the cats replaced with ... ARG Aftermarket. I do not think that it is timing related.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars
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  5. 08-04-2007, 04:02 PM #5
    attack eagle
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    Government stations then I take it? Best of luck to you.
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  6. 08-04-2007, 04:33 PM #6
    Martin in Bellevue
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    Canada doesn't test for NOx? Lean that thing out, after checking the spark plugs for a fouled 'en or fuel saturation from bad gap.

    Love the 6er.
    erased due to slander
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  7. 08-04-2007, 05:10 PM #7
    Qube
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    Mine was on the dot for CO2% this year. We'll see what happens in two years!
    :: HIDCanada.com | Illuminating Your World

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  8. 08-09-2007, 10:09 AM #8
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    Getting somewhere, the engine light came on, on the drive back home. And the car started idling like crap... Odd
    So I changed the cap and rotor and a vacuum hose, cleaned the ICV reset the DME, engine light came back on.

    I will now check the O2 circuit, spray the engine to locate vacuum leaks, swap the AFM and drive the car...

    To be continued.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars
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  9. 08-09-2007, 11:35 AM #9
    Ross
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    An injector not closing perhaps. This was a big part of some recent trouble for me.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"
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  10. 08-09-2007, 11:42 AM #10
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    Quote Originally Posted by Ross
    An injector not closing perhaps. This was a big part of some recent trouble for me.
    Could be.... in that case one cylinder should have a black spark plug???
    I have a set of 21lb... maybe I should do a complete swap instead of the 19lb.
    '85 Euro 635csi Race Turbo, megasquirt, Group A
    '92 525i Touring 5 speed, 3.46 diff, UUC 8.5lb flywheel, soon to be turbo.
    '02 Subaru WRX Wagon with STI springs, bigger sway bars
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