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Thread: Rough idle & aircon problem

  1. #1
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    Question Rough idle & aircon problem

    My 2.2 Direct Petrol Auto has been idling slightly rough with some vibration felt through the steering wheel, for a few weeks now. The idle speed seemed to oscillate between (say) 650 and 800 RPM. The idle seemed better, though not perfect, with the aircon switched off.

    On Sunday just gone, with the temperature over 25C, I set off for my first longish, motorway drive since the rough idle started. Immediately I sensed a regular periodic (say every 5 secs) slight, shortlasting, hesitation/surge in the engine. This lasted the whole journey (65 miles or so). On stopping, the idle had a regular periodic 'blip' to it, where every 3 or 4 seconds, the RPM dropped to 500 or below for a split second and then returned to 725 (ish) and the vibration occured with the 'blip'. The aircon didn't seem to be cooling the cabin anyway, so I switched it off. When I switched it off, the regular 'blipping' stopped and the idle (though not perfect) greatly improved.

    I kept the aircon off on the return journey on the motorway, and the regular periodic (say every 5 secs) slight hesitation/surge in the engine whch I experienced on the outward journey no longer occurred.

    No fault signs have occured.

    Does anyone have any ideas on the cause of these 'symptoms' ?

    Thanks.

  2. #2
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    Default Rough idle & aircon problem

    Anyone ?

  3. #3
    Regular Member nikroc's Avatar
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    Vehicle : 2t

    Trim : standard

    Engine : z20net

    Year : 08

    Mileage : 32000

    Default

    Have you got an airleak?..try tightening all the jubilee clips you can find,air box screws etc..

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