Check engine light flashing when engin stumbles

Discussion in 'General Motoring' started by bemo, Jan 19, 2007.

  1. bemo

    bemo Guest

    I noticed some stumbling of the engine when maintaining speed up hill
    or accelerating in a high gear. One day the check engine light started
    flashing and then stayed on. The day I was to take it into the shop to
    get the codes checked checked, the light went off and stayed off for
    about a week but the engine still stumbled under the sames conditions.
    About two weeks later the light came back on and I got it into the shop
    to check the codes and it came back as an engine misfire. They
    sugested I change the plugs. As I had just changed the plugs 6000
    miles earlier I thought this was a bit strange, but the service manager
    told me that if I had used Bosch platinum plugs that was most likely
    the root of the problem. So I changed the plugs again using the NGK
    plugs recommended in the owner's manual.

    The engine purred likem a kitten

    For about a hundred miles and it started all over again. I'm now
    thinking that it could be either the Crank Position Sensor, Throttle
    Position Sensor the Coil Pack. God help me if it's the control module.

    Gas mileage is still fine and the problem with the stumbling is
    intermittent but chronic. It has yet to stall during one of these

    Am I on the right track with suspecting of the sensors the sensors?
    Also I am aware that the timing belt is overdue for service. Can those
    things stretch to a degree that this kind of thing might happen? I
    remember having an old Dodge Colt with a stripped crank pulley and the
    engine would stumble in much the same manner.
    bemo, Jan 19, 2007
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  2. bemo

    Partner Guest

    What year, model, engine?
    Did you change the plug wires when you changed plugs? You didn't say what
    the DTC was but if its P0300-P0306, I would suspect the wires first, then
    the coil.
    Partner, Jan 19, 2007
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  3. bemo

    hyundaitech Guest

    Misfire codes, especially those that can be felt as a lack of power and
    engine vibration, tend to be caused by the secondary ignition components
    (plugs, wires, coils).

    Since the problem went away briefly and then came back, I'd suspect that
    you may have a carbon-tracked spark plug. When this occurs, a line of
    carbon runs down the inside of the wire boot along the spark plug from the
    tip to the hex, providing an alternative path for the electicity. In your
    case, there may have been such a line in the wire boot so that it only
    took a short period of time to recreate the path when the plugs were
    replaced. In that case, you'll probably need to replace the plugs and
    hyundaitech, Jan 19, 2007
  4. bemo

    hyundaitech Guest

    You may need to replace the plugs and wires at the same time. What you
    describe sounds like the classic symptoms of a carbon-tracked spark plug
    and wire. When this occurs, a track of carbon runs down the porcelain of
    the plug from the external tip to the hex, providing an alternative path
    for the electricity. The carbon will be on the plug and the wire. If
    just the plugs are replaced, the track on the wire remains and will become
    active again in a short period of time. If just the wires are replaced,
    the track on the plug remains and will become active again in a short
    period of time.
    hyundaitech, Jan 22, 2007
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