Muffler rattle

this little sound clip is something maybe some of you have heard,,,,but maybe not,,,,this is a rattle noise coming from the exhaust system,,,,there is a metal spring clip that breaks and causes the metal flap inside the muffler tip to flap around and cause this rattling noise.image Here is the metal spring clip,,,,it is attached to a electric motor that opens and closes that flap inside the muffler tip,,,,and for some reason sometimes that metal spring clip breaks,,,,so we just put a new one back on and the noise goes away,,,,now some of you may have heard a rattle noise from your muffler tip during cold start,,,now that muffler flap is differs,,,that one is vacuum controlled and on that one,,,,the flap inside the muffler goes bad and rattles in the morning,,,,so to fix the vacuum controlled one,,,,we replace the rear muffler section.

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4 Responses to Muffler rattle

  1. a.a. says:

    i believe the 3 series is vacuum operated because I’ve indeed had that one go on me.
    Is the 750 Li vacuum or electric?


  2. This is some really good information about mufflers. I like that you explained that the rattling noise could be created because a spring clip has come loose. It seems like it would be smart to take your car into an auto shop if it is making any sort of odd noise.


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