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.

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

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/