1994 Integra: Strange RPM Behavior (Part 2)

Discussion in 'General Motoring' started by arock, Jan 31, 2008.

  1. arock

    arock Guest

    I've had this problem for about a year now. In fact, I had a thread
    about it at one point here:

    I have about 185k on the car now. Since that time I've had the
    transmission fluid changed. My mechanic seems to think it may have
    something to do with the torque converter. The problem is about the
    same and doesn't seem to be any better or worse, just somewhate
    annoying. Here is the original message I posted last year (see the
    link above for the original replies):


    I have a 1994 Acura Integra LS automatic with about 175k miles. I've
    noticed that something occurs when I'm cruising in the higher speeds.
    When I'm going about 70mph the RPMs are roughly 3000. When I hit the
    gas to speed up to 75 or so, the RPMs sometimes (not always)
    *decrease* by around 200 RPMs . Then it will jump back up to the
    correct higher RPM a few seconds later, especially if I release the
    gas slightly. Please note that I'm not hitting the gas hard enough for
    the transmission to gear down when this happens. At first I thought
    that it was just the RPM gauge behaving strangely. But, after doing
    this a number of times, I can actually feel the engine losing the PMs
    ever so slightly. I can't seem to recreate this issue in lower speeds,

    Any ideas what could be causing this and how to possibly fix it?

    arock, Jan 31, 2008
  2. arock

    jim beam Guest

    it's mechanically impossible for the revs to drop while the speed
    increases - unless the lockup clutch is disengaged, you're going down a
    hill and you take your foot off the gas. if the revs drop when you
    increase gas, you likely have a "flat spot" caused by something like bad
    ignition or blocked egr, but that would be accompanied by a decrease in
    speed also.
    jim beam, Feb 1, 2008
  3. arock

    Tony Hwang Guest

    How old is the fuel filter? EGR, ignition parts(wires, plugs)?
    Tony Hwang, Feb 2, 2008
  4. arock

    arock Guest

    The fuel filter might be just a couple of years old and the other
    parts are in pretty good shape I think. I would imagine if it was any
    of those parts the car would run badly no matter what the speed,
    though. My problem only occurs at higher speeds. Otherwise, the car
    runs great. Thanks...
    arock, Feb 2, 2008
  5. arock

    jim beam Guest

    did you check the items i listed - or does "otherwise it runs great"
    mean you don't have to do that? i mean, usenet means you stay inside
    where it's warm, but it doesn't fix your car.
    jim beam, Feb 2, 2008
  6. arock

    bi241 Guest

    The engines rpm drops by about 200 - 300 rpm when the torque converter
    lockup engages (load on the engine increases) and jumps up when the TC
    lockup disengages (trans operates in limited slipping mode)

    i've had no experience with Acuras, but in Hondas, the lockup should
    occurs at about 50-55 mph on moderate throttle and should only
    disengage when you hit the brakes, or go up a steep hill, or get off
    the gas pedal (takes a moment), or pound hard on the gas pedal

    If the TC lockup engages and disengages at the slightest change of
    throttle or the vehicle's speed, or for no apparent reason at all when
    cruising, then incorrect throttle valve cable (aka kick down cable)
    adjustment is most likely the culprit. i'm thinking your cable is
    loose (too much free play), if it is, tighten it up!! Dont continue to
    drive your car in this condition or the TC will fail!!!!

    i've learned that in newer AT, the lockup mechanism works at lower
    gears too, but i'm sure none of 1994 vehicles has it, that's why you
    dont see sudden drops and jumps on the tach at slower speed

    oh and make sure the fluid is not burnt and filled at the correct
    bi241, Feb 3, 2008
  7. arock

    arock Guest

    jim beam-
    I'll be sure to bring those items up you mentioned with my mechanic
    when I bring it in. I appreciate you taking the time to look into this
    for me.
    arock, Feb 3, 2008
  8. arock

    arock Guest

    I will definitely have my mechanic look at the throttle valve cable,
    too. Thanks for your help. I appreciate it.
    arock, Feb 3, 2008
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