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Thread: Strange goings on with revs.

  1. #1
    Regular Member Danialj32's Avatar
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    Default Strange goings on with revs.

    Wasn't sure where to post this but i've put it in here anyway!

    It's not my engine, it's my mum's 316 (I think) coupe BMW 52 reg. When idling the revs would sit just below 1000 for about 5 seconds, then raise to 1500 for about 5 seconds, then back down, then back up, and so on, following the pattern. Any idea what this could be?

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    Admin & Merchandise Manager bigmac's Avatar
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    Vehicle : insignia

    Trim : irmscher

    Engine : 2.0 cdti

    Year : 2009

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    Sounds like an air leak ?

    Irmscher Insignia CDTI 130

    MOD'S...Irmscher front spoiler, Irmscher mats, Irmscher door pins, Irmscher rear spoiler, Irmscher grille, Irmscher skirt & exhausts,Irmscher Roof spoiler MOD'S TO COME..Side skirts,Wheels

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    Regular Member Danialj32's Avatar
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    That doesn't sound too healthy! Had a quick look under the bonnet, and couldn't see anything out of the ordinary, was no EML on her car or anything.

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    Regular Member Dose's Avatar
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    check the pipe going to the idle speed control valve under the inlet on the right hand side... usually comes off as it swells or splits as it gets contaminated..very common among these.. also not gonna hurt to pull the ICV off and a clean with brake cleaner or the like...

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    Regular Member Danialj32's Avatar
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    Shall have a look tomorrow, glad to know it's a common prob! They're getting rid soon so hopefully it's nothing major!

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    Regular Member Cruize's Avatar
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    Like DOSE says... Check the ICV, electronic throttle give that a clean too. My Mums Volvo C70 did this, the revs would bounce at idle like they were on a trampolene. My old mans a mechanic and flushed the system with some injector/carb cleaner stuff through the manifold..... No idea what it was but it sorted it right out.

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