Flat spot with d15b7 EG civic

Discussion in 'Civic' started by MikeLikes, Oct 15, 2010.

  1. MikeLikes

    MikeLikes Guest

    My 1995 EG d15b7 Honda civic (not modified in any way) has a flat spot
    between 2000rpm and 4000rpm. I have tried new plugs, new fuel and air
    filters, checked timing, new plugs, different plug gap, fuel cleaners
    and better petrol, checked resistance on leads and cleaned the
    distributor cap and button but the problem does not go away. Does
    anyone have any ideas on what it might be or how to diagnose it.

    MikeLikes, Oct 15, 2010
  2. MikeLikes

    jim beam Guest

    automatic? [don't presume that "d15b7 tells us enough.] if so, it's
    the egr valve and passages clogged. also check the transmission fluid
    is not over-full and that the kick-down cable is adjusted properly.

    as a separate issue, do not "clean" the distributor cap and button:

    1. unless you've taken the essential precaution of wearing gloves,
    sweaty fingers can leave salty residues on them which attracts moisture
    and causes spark leakage. same applies to plugs and leads.

    2. if the cap is aftermarket and has brass contacts, oxide product can
    be conductive and you're simply smearing it around. replace with oem
    honda cap with all aluminum contacts which doesn't have this problem.
    jim beam, Oct 15, 2010
  3. MikeLikes

    MikeLikes Guest

    It's a 5 speed manual not an auto and the cap is oem.
    MikeLikes, Oct 15, 2010
  4. MikeLikes

    jim beam Guest

    was the timing belt changed recently? belt may be off a tooth. if the
    distributor is not centered to get it timed, that's the tell-tale.
    jim beam, Oct 15, 2010
  5. MikeLikes

    MikeLikes Guest

    Yes the timing belt was changed recently but the problem was there
    before the change. I am pretty sure that the crank and the cam were
    lined up at TDC as I dis the timing belt change.
    MikeLikes, Oct 18, 2010
  6. MikeLikes

    jim beam Guest

    pedantically speaking, the important thing is that they're lined up
    /after/. did you follow the checking procedure outlined in the factory
    honda manual? haynes manuals are notoriously awful. loose belts jump
    teeth too, so even if timed before, they can be out later. again, check
    the ignition timing and confirm that the distributor is close to center.

    beyond that, you'll need to be more specific with diagnosis rather than
    this "hopefully lucky" guesswork stuff. a compression test might be in
    order for instance.
    jim beam, Oct 18, 2010
  7. MikeLikes

    Dillon Pyron Guest

    My 96 EX 5 speed had a similar sort of flat spot, even before the belt
    was changed. Which made it kind of a PITA when I was Auto-Xing. I
    don't know if it was specifically that, but after the O2 sensor was
    changed (via a CARB ordered recall) it "went away". Problem is, there
    were several other changes at the same time.

    - dillon I am not invalid

    Toby (Tri-Umph That's the Sweet Truth)
    March 1998 - June 2010
    What a dog. What a dog!
    Dillon Pyron, Oct 25, 2010
  8. MikeLikes

    Frank Guest

    Hi Mike

    Sounds like a "Vacumm" issue. Check for any leaks.
    Frank, Oct 27, 2010
  9. MikeLikes

    MikeLikes Guest

    Hi guys,
    Thanks for the tips. This now give me a starting point at what to look
    MikeLikes, Oct 30, 2010
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