Up and down idle when weather is cold

Discussion in 'General Motoring' started by thecricket, Nov 30, 2005.

  1. thecricket

    thecricket Guest


    I'm hoping somebody can help shed some light on this problem. My
    vehicle only does this as the weather gets cold. Throughout the summer
    I don't have the problem. It only returns in cold weather.

    When I first start my vehicle the engine will idle normal for a minute
    or so then it will go into rev up then drop off then rev up loop over
    and over. I found if I put the vehicle into gear the strange idle
    stops. Also if left longs enough without putting it into gear for 10
    or 15 minutes I believe it will correct itself and stop reving up and
    down. However I've only witnessed this once as I generally don't wait
    around long enough for it to stop. Like I said as soon as I drive it
    goes away. By the time I get to where I'm going it will sit and idle
    just fine?

    Thank you for your time. Any responses will be greatly appreciated.

    Thank you, Jeff
    thecricket, Nov 30, 2005
  2. thecricket

    Burt S. Guest

    If you can identify the bleed screw, release the screw to force air out
    once you fill coolant up to the filler neck on a warm motor with the heater
    on Max. There are a couple sensor that can foul your 92 Accord cold idle.
    The EACV is one of them.
    Burt S., Nov 30, 2005

  3. -----------------------------

    Cool, Psychic diagnosis. It does exist!! OP didn't mention the make,
    year, or model, did they?

    'Curly Q. Links', Nov 30, 2005
  4. thecricket

    thecricket Guest

    I'm sorry. The vehicle is a 91 Honda Accord EX.
    I didn't quite understand the 2nd posting can anyone give some more

    Thank you, Jeff
    thecricket, Nov 30, 2005
  5. thecricket

    Keyser Soze Guest

    The suggestion is that you have an airlock in the cooling system that is
    confusing the car's sensors and the EAVC. He/she suggests you bleed the
    system to remove the trapped air.
    Keyser Soze, Nov 30, 2005
  6. thecricket

    Burt S. Guest

    Bleeding is important. I'd set up a page just for bleeding. Check it out here.


    I'd kinda knew the OP has a 91or 92 from his history. Anyway, most of the
    fluctuating RPM tends to happen to fuel injected Hondas.
    Burt S., Dec 2, 2005
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