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.

jim beam wrote:
> TeGGeR® wrote:
> > wrote in
> > oups.com:
> >
> >> 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 we
> >> 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.
> >>
> >>
> >
> >
> >
> > If you have an automatic, check the EGR system.
>
> 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.
>
> >
> > 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:
> > http://www.tegger.com/hondafaq/misc/...emissions.html
> >