91 Acura Integra - High NOx - Failed emissions test - NJ

Discussion in 'General Motoring' started by sabys, Aug 9, 2006.

  1. sabys

    sabys Guest

    My 91 acura Integra LS failed the emission test a second time for high
    NOx. Could the gurus please provide some input on what I should be
    checking? Here are the details.

    Test 1:
    NOx - 1984
    HC - 91
    CO% - .34
    CO2% - 14.3
    O2% - .6

    After this test, my mechanic replaced the Catalytic convertor. The
    second test results were:
    Test 2:
    NOx - 1367
    HC - 10
    CO% - 0.00
    CO2% - 13.2
    O2% - .9

    So, the NOx did drop but not enough to pass the test. (The pass level
    of NOx in NJ is 1088)

    Any recommendations on what could be the big culprit?

    Thanks in advance.
    sabys, Aug 9, 2006
  2. sabys

    TeGGeR® Guest

    wrote in

    If you have an automatic, check the EGR system.

    Check base ignition timing. With the Service Check Connector shorted, the
    timing mark on the timing belt cover should be in the middle of the group
    of three on the crank pulley.

    I'm wondering if the reduction side of your "new" cat is defective. Your
    CO2 reading is WAY too low. It should be well over 15%.

    By the way, NJ is *extremely* generous with their limits. Where I live,
    they're postively totalitarian about it:
    TeGGeR®, Aug 9, 2006
  3. sabys

    jim beam Guest

    indeed. the op needs to make sure the ignition is set correctly too. a
    lot of non-honda mechanics don't bother with the service connector when
    setting timing and it's frequently out.
    jim beam, Aug 12, 2006
  4. sabys

    sabys Guest

    Thanks guys. Tegger, jim you were right on the mark. It was the base
    ignition timing. I had that adjusted and the NOx dropped to 1013 and
    passed the test.
    sabys, Sep 10, 2006
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