rough idling '98 Prelude

Discussion in 'Prelude' started by will, Sep 8, 2005.

  1. will

    will Guest

    I need help diagnosing the rough idle of a 2.2L VTEC. I have the
    factory manual. I have replaced the plugs, distributer cap and rotor,
    and plug wires. I removed the EGR valve and cleaned it with carburetor
    cleaner as per the manual. The two codes which are still outstanding
    are "number 4 cylinder mis-fire" and #1399, which is "manufacturer
    control ignition system or misfire". I listened to the injectors with a
    stethoscope (according to the manual) and all sound the same. Any help
    would be greatly appreciated.
    will, Sep 8, 2005
  2. will

    TeGGeR® Guest

    Have you cleaned out the EGR passages in the head? It will do no good if
    the EGR valve can pass gas (excuse me), but not deliver it in correct
    quantity to the correct cylinders.

    Have you cleared the codes to see if they come back?
    TeGGeR®, Sep 8, 2005
  3. will

    will Guest

    Thanks for replying. I cleaned the head passages as well as I could
    with a small brush/rag. The valve had some carbon build-up, but was not
    stopped up. I don't know if it means anything, but the valve leaks
    carburetor cleaner past the seat in the closed position. I checked it's
    operation with a vacuum pump, and it operates with no leak-down. The
    first codes read were, "system too rich", "cyl. 4 mis-fire" and two
    codes for "EGR insufficient flow detected". Now the only two recurrrent
    codes are the two mentioned in the first post.
    will, Sep 9, 2005
  4. ===========================

    Has it ever stalled while it's warming up, like at a stop sign? What
    does your owner's manual say about the frequency of valve adjustments,
    and what's your mileage? The (early) CR-v manual is off by 55,000 Km, so
    I wouldn't trust the Honda owner's manual anyway . . . I think you need
    a valve adjustment / or it's too late.

    'Curly Q. Links', Sep 9, 2005
  5. will

    will Guest

    Thanks for your response. It has not stalled, and runs fine at any RPM
    above 900 (using the car's tach.). The service manual calls for valve
    adjustments every 30K miles. The car has 128K on it now. As this is my
    daughter's car, and she bought it used, I don't know if the valves have
    ever been adjusted. I'll check them tomorrow (engine cold).
    will, Sep 9, 2005
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