Idle too low on my 2000 honda civic.

Discussion in 'Civic' started by luketrif, Oct 23, 2005.

  1. luketrif

    luketrif Guest

    Hello all,

    I just bought a 2000 honda civic ex with 54k miles on it. The problem
    is that the car once is warmed up, idles too low, almost at the 0rpm
    line but probably around 200-300rpm, however the needle looks like its
    all the way on zero. Once i accelerate, the engine shakes a bit and
    then comes back to normal, but same thing happens again when i stop at
    a stop light etc. Everything is stock. Any help would be appreciated


    luketrif, Oct 23, 2005
  2. luketrif

    Elle Guest

    Start by waiting overnight (until the engine is stone cold), then remove the
    radiator cap and top off the radiator. Fill the reservoir to at least the
    minimum line. Run the car until it's at Normal Operating Temperature, then
    add coolant ot the reservoir until it's at the max. line. Lastly, purge the
    cooling system of air.

    Certain engine control components, including idle control, have coolant
    passing through them. If there's an air pocket, they aren't being properly
    cooled, and mis-idle problems like yours can occur.

    Very common.
    Elle, Oct 23, 2005
  3. luketrif

    TeGGeR® Guest

    wrote in

    That's 500 rpm, not zero. The tach cannot read lower than 500 rpm.

    Check cleanliness of throttle body. Check cleanliness of IAC (Idle Air
    Control valve).

    If IAC is sludged up, it will be unable to adjust the idle properly.
    TeGGeR®, Oct 23, 2005
  4. luketrif

    RM Guest

    Where is that IAC located? What does it look like?
    RM, Oct 23, 2005
  5. luketrif

    TeGGeR® Guest

    Right behind the throttle body about where the throttle plate is. It sort
    of looks like a cylinder. It has two tiny coolant hoses connected to its
    underside, and one electrical connector.

    You should pull off the air tube to the throttle body. This will expose the
    throttle plate and the intake port for the IAC. If the thing is oily and
    gungy, you'll know right away.
    TeGGeR®, Oct 23, 2005
  6. luketrif

    Mike Doyle Guest

    Checked my 94 VX, & had the same problem. A ? about purgeing the
    system. Just keep topping off the reservoir, or is there something else
    to do?


    Mike Doyle, Oct 24, 2005
  7. luketrif

    Elle Guest

    Yes, there are a few more steps. Your owner's manual has this procedure.
    Alternatively, use the following:

    Mix a solution of 50% ethylene glycol (designed for use in aluminum engines)
    and 50% distilled water. With the engine cold, remove the radiator cap and
    fill the radiator all the way to the filler mouth.

    Loosen the cooling system bleed bolt to purge air from the system. (If you
    don't know what this is, ask.) When coolant flows out of the bleed port,
    close the bolt and refill the radiator with coolant up to the mouth.

    To purge any air trapped in other parts of the cooling system, leave the
    radiator cap OFF, set the heater control (inside the passenger compartment)
    to Hot, start the engine, set it to fast idle and allow it to reach normal
    operating temperatures BY LETTING THE FAN COME ON TWICE. This will probably
    take at least 40 minutes, so have a magazine handy. Meanwhile, DO NOT
    tighten the radiator cap and leave the heater control in the Hot position.
    When the engine reaches normal operating temperatures, top off the radiator
    and keep checking until the level stabilizes; then, refill the coolant
    reservoir to the Full mark and make sure that the radiator cap is properly
    Elle, Oct 24, 2005
  8. luketrif

    Mike Doyle Guest

    Thanks. I've noticed its better already. I'll use this procedure to
    finish it off.
    Mike Doyle, Oct 24, 2005
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