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Thread: 2014 228it exhaust rattle at idle

  1. #1
    Join Date
    Aug 2018
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    Lockport, NY
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    My Cars
    2011 BMW 128i coupe

    2014 228it exhaust rattle at idle

    Daughters car has an exhaust rattle at idle. Thinks it could be exhaust system valve that is vacuum controlled, by throttle opening, of course. Is there a reasonable fix, like vac hose off or sensor wire off? Thanks

  2. #2
    Join Date
    Jul 2013
    Location
    Casablanca, Morocco
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    259
    My Cars
    2001 e46 323i
    Quote Originally Posted by tif128 View Post
    Daughters car has an exhaust rattle at idle. Thinks it could be exhaust system valve that is vacuum controlled, by throttle opening, of course. Is there a reasonable fix, like vac hose off or sensor wire off? Thanks
    Given that it's only at idle I don't think it's coming from the secondary exhaust valve/flap you're refering to, since it only opens past a certain throttle point (which means you should hear it not only at idle but even at low revs/engine load).

    It probably has more to do with the exhaust line touching another piece of metal somewhere, due to a worn off or misplaced rubber mounting.

    If that's coming from the secondary flap, google "golf tee mod". It's the easiest thing to do and it'll keep it permanently opened
    5spd E46 "3XX": 328i engine, 330i Intake and exhaust, CAI, 323i diff.

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