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    Renault megane 1.6 16v 2002 - Poor idle, high O2 7% # Archived Message

    Posted by Daniel Plymouth on April 18, 2007, 10:32 pm

    Hi,

    The car idling is very very bad it keep hardly running on idle, needs to be started by accelerating otherwise it just stalls.

    DTC found related to downstream lambda sensor, I've checked the lambda and it looks ok.

    emissions:

    on idle
    O2: 7%
    HC: 600 ppm
    Lambda: 1.3
    CO2: 6
    CO: 1.5

    on fast:
    02: 0.5%
    hc: 40 ppm
    co2: 12


    New idle control valve, spark plugs and Coils fitted by garage.

    Throttle potentiometer looks ok although it keeps on 2.2 volts on idle, is it ok?

    Lambda front and rear looks ok,
    Front lambda kind of try to switch but very intermittent.

    any ideas what could be causing this problem?

    Thanks
    Daniel

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