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  1. S

    Just bought a 1994 MX3 GS

    EGR will help reduce NOx emissions a bit. But the pre cat mainly assists during the warm-up from cold start. Any time you emissions check, you want the car running at normal operating temps, and the pre cat does little to assist when it's hot. The high HC though is going to be because of a bad...
  2. S

    Just bought a 1994 MX3 GS

    The OBD1 system doesn't have a very robust monitoring system. O2s in particular will just misreport readings, affecting air fuel ratio most of the time without triggering a code. In particular, I had a set of O2s which caused my MX3 to run rich. We monitored the voltage which wasnt throwing a...
  3. S

    Just bought a 1994 MX3 GS

    Are you on facebook? Join the "MX-3.com" group. the online website forums are quite inactive. If you haven't already, consider ordering parts from Rockauto.com They're often the most affordable parts source. Cheap catalytic converters are basic ceramic core converters that are prone to early...
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