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Thread: Strange sound BMW 325i

  1. #1
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    Strange sound BMW 325i

    Can someone tell me what this sounds like to them?

    This all started when i went really fast on the highway with about 1/4 tank of gas. Since then I have replaced CCV and valve cover gasket.

    https://youtu.be/XDmNtDn2N5Q
    Last edited by rlpcam; 01-15-2017 at 07:58 PM.

  2. #2
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    Anyone??

    swapped coils and spark plugs.

  3. #3
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Which sound are you talking about, for I hear 2 different one: Engine noise and maybe an exhaust leak. Put a glove on and see if you can cover the tailpipe to see if the pressure builds. If it doesn't then you have an exhaust leak.
    Darin
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  4. #4
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    The possible exhaust leak sound is what I'm referring to. How would I tell if pressure is building?


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  5. #5
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    Quote Originally Posted by dworthy View Post
    Which sound are you talking about, for I hear 2 different one: Engine noise and maybe an exhaust leak. Put a glove on and see if you can cover the tailpipe to see if the pressure builds. If it doesn't then you have an exhaust leak.
    I just tried this and I did not feel any pressure buildup on my hands and no change in rpms.

    Also I have a CEL code p1349 which is misfire w/ fuel cut off. Would an exhaust leak cause a misfire?

    The i6 engine sounds like it's running similar to a v8, not the normal speed and sound of a fully functioning inline 6.


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  6. #6
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Since you have confirmed that you do have an exhaust leak, you can put it up on jackstands and look from there. Normally you can find them by the black soot on the otherwise rusty pipes.

    As for the misfire code:
    Faulty Spark Plug
    Faulty Ignition Coil
    Intake vacuum leak
    Faulty Camshaft Position Sensor
    Ignition Coil harness is open or shorted Ignition Coil circuit poor electrical connection


    Read more: https://www.autocodes.com/p1349_bmw.html
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  7. #7
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    Thanks for the info. I am assuming the misfire is due to loss of back-pressure or caused by a false O2 reading, something like that. Will inspect the pipes next and report back with update.

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