Honda Civic DX 1990 - cannot accelerate properly

Discussion in 'Civic' started by Thien-Anh, May 29, 2004.

  1. Thien-Anh

    Thien-Anh Guest

    Honda Civic DX 1990
    I changed an used distributor about two years ago. I have a one-month new
    clutch and all my valves are adjusted. My water pump and timing belt are
    about two years. My car ran smoothly for the first week after adjusting the
    valves, but the same old problem occur after that. The problem is that when
    I press on the gas pedal unexpectedly, it does not accelerate immediatelly.
    Some times it does not even accelerate. The engine is reving, but no
    acceleration. I took to so many mechanic, but no one knows what causes it.
    Any one has similar problem, please share. Thank you.
    Thien-Anh, May 29, 2004
  2. Thien-Anh

    motsco_ _ Guest


    The new clutch needs to be adjusted, now that it's 'broken in a bit'.
    If engine revs up, but no increase of ground speed, clutch is slipping.

    If engine runs weak, timing belt is out a notch.

    motsco_ _, May 30, 2004
  3. Thien-Anh

    Thien-Anh Guest

    I forgot to mention that it also happen with the old clutch. This is the
    first time I changed my clutch. So, would the problem occurs in the first
    Thien-Anh, May 30, 2004
  4. Thien-Anh

    Tony Hwang Guest

    Sounds like timing issue.
    Is there any vacuum leak in the intake manifold?
    Tony Hwang, May 30, 2004
  5. Thien-Anh

    Thien-Anh Guest

    Interesting issue. I'll check that for sure. Any more possibilty? Thanks
    Thien-Anh, May 30, 2004
  6. Thien-Anh

    jim beam Guest

    check the tandem valve is operating properly. if you take off the top
    off the throttle body, you can see it operating like a choke - it should
    open when you open the throttle.

    there's a piece of vacuum hose that runs from the tandem control valve
    [at the bottom of the throttle body] to the tandem diaphragm. if this
    is cracked & leaking, you'll have exactly the problems you describe
    because the tandem is not opening fast enough and the valve is choking
    off air supply to the engine during acceleration.
    jim beam, May 30, 2004
  7. Thien-Anh

    Thien Anh Guest

    These are great possibilities. I'll check it tomorrow and let you guys
    know. Please let me know more if there are other possibilities. Thanks
    all. :)

    Thien Anh, May 31, 2004
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