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  1. H

    Jdm h23a vtec blue top swap guide

    I'm having a problem with a CEL for primary O2 sensor heater circuit as well.. Did you ever find a fix?
  2. H

    H23a DOHC vtec swap

    Are you using your old f23 harness?
  3. H

    H23A P28 idle surging!

    I had the same thing happen after my h23a swap. Just need to bleed out any air pockets in your coolant lines. Coolant runs through the iac and if it isn't a constant flow it will cause idle surge.
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