I had an emissions prob w/ my 86 Civic Wagon, auto/air/2wd, carb.
My prob was NOX [nitrous oxide] which the guy from State EPA told me
was "fixable," which I thought was an odd word to use [what ISN'T
fixable?]. What he meant was fixable at reasonable cost, probably via a
cat converter. If the prob were HC [hydro-carbons], it could have
meant bad rings which, as stated in previous posts here, is
unfortunately expensive. [But other things can cause HC probs;
hopefully economical carb adjustments.]
I didn't get cat converter because in this state I was eligible for an
emissions waiver since my spending on this repair job [a lot of carb
work] had reached a certain threshold.
You may want to see if your state offers emissions waivers. The state
inspection office I used was not well informed on the issue.