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328 ECU Troubleshooting - Expert Advice Needed

Discussion in 'Technical Q&A' started by GTHill, Sep 15, 2008.

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  1. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
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    Lawrence A. Coppari
    #26 Lawrence Coppari, Sep 17, 2008
  2. GTHill

    GTHill F1 World Champ
    Lifetime Rossa Owner

    Jul 1, 2006
    14,054
    Double Wide
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    GT Hill
    #27 GTHill, Sep 18, 2008
    Ok, so I hit a snag. I pulled the old O2 sensor and discovered that it had been crossthreaded. It must have happened when I had that redneck exhaust shop put in my homemade test pipe. I guess it's time to breakdown and get a real one from Daniel. For now, I'm running it without the O2 sensor, and to be honest, I don't think it has run this smoothly in quite some time. Weird?

    Gene
     
  3. GrigioGuy

    GrigioGuy Splenda Daddy
    Lifetime Rossa Owner

    Nov 26, 2001
    33,428
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    Enzo Gorlomi
    #28 GrigioGuy, Sep 18, 2008
    Not weird. Remember, the injection system is basically mechanical, and all the electronics do is try to add a little delta to that mechanical flow. Take out those extra inputs, and if it's physically ok it just burbles along.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #29 Steve Magnusson, Sep 18, 2008
    Last edited: Sep 18, 2008
    Running without an O2 sensor connected on a US version 328 is very similar to how a euro 328 works (so generally would work OK if the manual tweak is reasonable, as you've found) except for 1 unusual condition -- an extended period of very high intake manifold vacuum. On a euro 328 (and all non-Lambda K/KE-Jet), they have a vacuum limiting valve that prevents the intake manifold vacuum from ever going super high for a long time if you're at high RPM and quickly close the throttle and/or go into a lengthy period of hard, high RPM engine braking (like going down a steep hill with the throttle closed). US 328 don't have (or need) this vacuum limiting device so try to stay out of that condition until you can make the repair.
     
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