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uneven idle 900 1995

posted by  MDL on  Sun Nov 3 03:37 CST 2002
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Here is a '95 940 Sedan with 131,000 mi. When veh. is evenly idleing, we hear and feel a "popping" or "tremble" sensation every few seconds or so. Also, when trying to keep a 45-50mph rate, we feel a "tremble or bucking" sensation as we let off the gas. thx, MDL








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    uneven idle 900 1995

    posted by  someone claiming to be jpezie on  Tue Nov 5 00:02 CST 2002 [RELATED]

    Please check if the knocksensor has come loose.
    This could be a possible cause of your complaint.
    Knocksensor is a little square blackboxand is located on the left side of the engine block in front of the airmotor, behind the connecting hose, running to the front.
    Knock sensor should be tightened to a certain value, which i dont'know off hand.

    John








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    uneven idle 900 1995

    posted by  someone claiming to be jpezie on  Sun Nov 3 23:53 CST 2002 [RELATED]

    Just for my info: is your airco switched on ?

    John








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    uneven idle 900 1995

    posted by  someone claiming to be joe walsh on  Sun Nov 3 08:48 CST 2002 [RELATED]

    sounds like misfire / look at plugs for carbon traces from arcing.
    (is the car tuned?)








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      uneven idle 900 1995

      posted by  MDL on  Mon Nov 4 14:58 CST 2002
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      Yes, there is carbon on the rims of the plugs. But, where the porcelin and gap area is, it is white(clean?). Should they be cleaned completly and re gaped? Also, what would creat the carbon? Thx, MDL








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        uneven idle 900 1995

        posted by  someone claiming to be joe walsh on  Tue Nov 5 13:38 CST 2002 [RELATED]

        I would replace the plugs and wires
        arcing causes the carbon traces / the power is'nt all going down the center
        of the electrode (like its supposed to) instead worn ignition components
        will "divert" the electricity and the carbon traces are the evidence.

        Cleaning will probably not help much, I'd start with plugs and wires
        and cap / rotor (on distributor) for good measure. This will establish
        correct ignition operation as a "starting point" (it's maintenance anyway)

        the "700/900" FAQ on this website is EXCELLENT reading almost anything
        you want is listed to include valuable drivability diagnosis by symptom.

        good luck. kevin walsh








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          ignition point 900 1995

          posted by  MDL on  Thu Nov 7 03:27 CST 2002
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          Kevin/Joe, thx. It won't be right away but, plugs, wires, cap & roter looks like the best way (like you say) to begin the base point for ignition. It should be done and will in by doing so eliminate possible problem. Mike







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