Greetings all,
I have a federal '93 civic vx that runs well, but is not passing smog (it did 2 years ago)..see attached smog levels. Any suggestions for troubleshooting? It was running rough over the summer (lugging at low rpms) , so I did spark plugs, dist cap, wires, and adjusted the valves. This smoothed out the drive considerably...could the valve adjustment have caused the change in smog levels? There is a range of adjustment,....but what is ideal for smog purposes? Both of these smog reports were after the tuneup-->. The only thing changed between tuneups was the 5-wire oxygen sensor.
Thanks so much,
brandon