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90 civic si w/ b16a1

Discussion in 'ECU's, Electronics, and Tuning' started by raider1911, Nov 11, 2003.

  1. raider1911

    raider1911 Junior Member

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    Nov 11, 2003
    Hey guys (and ladies), looking for some opinions. I'm strolling a 1990 honda civic si, with a moreless stock b16a1 with only typical bolt ons. Nothing too crazy, typical daily driver. My ecu would occasionally throw a engine code and when i turned the car off it'd be gone, now all of a sudden the check engine like is on all the time. I checked the ecu codes and its throwing code 9, and 23. cyp sensor, and knock sensor. Where would you guys start in order to diag this problem? Cars running like a champ as always, just concerned. Any help is appreicated..

    Thanx for reading,

    Tucson, AZ
  2. radnulb

    radnulb Senior Member

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    Sep 23, 2003
    Sinsinnaty, Ohio
    I'm presuming you have a PW0 or PR3 ECU.

    an intermittent knock code I would ignore. A persistent one I'd get rid of with a chip that doesn't look for a knock sensor.

    the CYP problem is much more serious. If the car is reguarly throwing this code, you probably have a bad distributor. You can swap the guts from your Si distributor if you still have it.

    in either case, wiring faults can cause the same problems as a sensor failure.
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