Idle speed dips after letting off gas - 92 civic d15b7

Discussion in 'Civic' started by Bob Radley (nazarl at idirect dot com), Jun 23, 2005.

  1. Hello All,
    I have something on my mind that keeps bothering me and so far I could
    not find an answer for it. I figured I'd post it and see if I could
    get some ideas regarding this.

    I have a 92 civic CX (canadian model with D15B7)with 300,000 km.
    Car has been running fine, except for the overheating issue I had with
    it when engine was under heavy load. I've replaced the head gasket,
    got the head machined and pressure tested, flushed rad and cooling
    system and that has taken care of overheating.

    Ever since this has been done, I've been having an intermittent problem
    where if I rev the engine and then abruptly let go of the gas so that
    the throttle closes abruptly (while driving or at idle, in neutral or
    with clutch depressed, does not matter), idle RPM will drop below 500,
    making it sound like it's trying to stall. It will struggle at this
    RPM for about 5 sec and return back to normal Idle of about 650 RPM
    where it runs just fine. It keeps doing this even after the car has
    warmed up.

    Engine by itself runs just fine at other rpm, there are no signs of it
    missing.

    I've got few things I am going to check within the next couple of days,
    such as timing belt tension, ignition timing, disconnecting air intake
    pipe, etc. I am just curious if you guys have any other ideas or
    suggestions about what I can try to do or possibly try to eliminate
    some of the possibilites.

    I would greatly appreciat some input on this.
    Thank You and Best Regards,
    BRadley
     
    Bob Radley (nazarl at idirect dot com), Jun 23, 2005
    #1
  2. Bob Radley (nazarl at idirect dot com)

    motsco_ _ Guest

    --------------------

    Your ECU got 'retrained' after the work, and now it's responding
    different. Hondas kill the injectors when not needed, and my old CR-V
    did that just like yours. Looks wierd, eh?
    You could search Google for info about honda ecu training.

    'Curly'
     
    motsco_ _, Jun 23, 2005
    #2
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