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Thread: Rattle engine noise under acceleration

  1. #1
    desmar's Avatar
    desmar is offline Cadillac Owners Member
    Automobile(s): srx4
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    Rattle engine noise under acceleration

    My engine makes a rattling sound under acceleration, it does it everytime a depress the gas pedal.
    Like I'm driving a manual transmission that is in a higher gear instead of a lower gear, example tranny is in 5th but should be in 3rd, then it makes a rattling noise.
    My srx does it for several seconds everytime I'm accelerating from a stop, coasting & I accelerate, etc.
    Any ideas, other than this it drives greAT, fuel is good, 12.6 liters/100 kms, new plugs, fuel filter change, injectors & intake manifold cleaned & flushed.
    D.


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  3. #2
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    Re: Rattle engine noise under acceleration

    Quote Originally Posted by desmar View Post
    My engine makes a rattling sound under acceleration, it does it everytime a depress the gas pedal.
    Like I'm driving a manual transmission that is in a higher gear instead of a lower gear, example tranny is in 5th but should be in 3rd, then it makes a rattling noise.
    My srx does it for several seconds everytime I'm accelerating from a stop, coasting & I accelerate, etc.
    Any ideas, other than this it drives greAT, fuel is good, 12.6 liters/100 kms, new plugs, fuel filter change, injectors & intake manifold cleaned & flushed.
    D.
    Hello desmar,

    I apologize that that you are experiencing a rattling sound when you are accelerating. I do see that you are located in Canada. Have you reached out to the Customer Care team in Canada regarding this issue? Their number is 1-888-446-2000. Please keep us updated on the status of this situation. Thank you very much for your time.

    Gregory W.
    Cadillac Customer Care

  4. #3
    glake89's Avatar
    glake89 is offline Cadillac Owners Connoisseur
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    Re: Rattle engine noise under acceleration

    If it sounds like a case of empty Coke bottles (shows how old I am), it's pre-ignition. I'd check out the KSs (knock sensors).
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  5. #4
    desmar's Avatar
    desmar is offline Cadillac Owners Member
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    Glake89, thanks for your idea.
    Tried antiknocking additives, higher octane gas, even change plugs thinking one could've been bad.

  6. #5
    orandaberg Guest
    Quote Originally Posted by desmar View Post
    Glake89, thanks for your idea.
    Tried antiknocking additives, higher octane gas, even change plugs thinking one could've been bad.
    None of that would have worked if your KS were faulty

  7. #6
    xboxman72 is offline Cadillac Owners Member
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    Re: Rattle engine noise under acceleration

    Loose heat shield on the exhaust pipe by the transmission?

  8. #7
    rlh6805 is offline Cadillac Owners Fanatic
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    Re: Rattle engine noise under acceleration

    Quote Originally Posted by xboxman72 View Post
    Loose heat shield on the exhaust pipe by the transmission?
    Yes, there is a TSB about that. It was the first thing I had the dealer fix when I got mine. It just needs to be welded back up.

  9. #8
    xboxman72 is offline Cadillac Owners Member
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    Re: Rattle engine noise under acceleration

    fixed mine with a hose clamp

  10. #9
    desmar's Avatar
    desmar is offline Cadillac Owners Member
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    Benn there, removed the shield above the cross pipes resonator, around all cats, spare tire, even applied rubberized under carriage coating. But no luck.
    Like I mention it sounds like a baby rattle or you are driving uphill with a manual tranny in a higher gear that what you are supposed to be in. Ex drive uphill in second but you select fourth instead give gas ang engine rattles, or knocks or detonated whatever,
    Gas mileage is being affected now & engine doesn't iddle as smith as before it kind of misfired every few seconds, Roma will go up & down for a few hundreds.

    ----------

    So it's not chassis related or loose car parts is engine or drivetrain related, maybe transfer case chain??!!

  11. #10
    tasbro is offline Cadillac Owners Member
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    Re: Rattle engine noise under acceleration

    My '06 3.6L had a rattling type noise upon acceleration. It's presently in the shop getting new catalytic converters.

  12. #11
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    Re: Rattle engine noise under acceleration

    Quote Originally Posted by tasbro View Post
    My '06 3.6L had a rattling type noise upon acceleration. It's presently in the shop getting new catalytic converters.
    Hello tasbro,

    I am sorry to hear about your current situation you are dealing with due to the rattling issue upon acceleration with your vehicle. I see your vehicle is currently getting new catalytic converters. If there is anything we can do to help; answer additional questions or concerns, don't hesitate to reach out to us.

    Sincerely,

    Laura M.
    Cadillac Customer Care

  13. #12
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    Re: Rattle engine noise under acceleration

    Tasbro, its rattling because of catalytic ?

  14. #13
    RussellBoulding is offline Cadillac Owners Fanatic
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    Re: Rattle engine noise under acceleration

    Does it make the noise if you rev in park or neutral or if you "power brake" the car.

  15. #14
    97EldoCoupe's Avatar
    97EldoCoupe is offline Owner of Northstar Performance
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    Re: Rattle engine noise under acceleration

    Timing chains probably, what year SRX? The symptoms sound all too familiar with my girlfriends' SRX- I ended up changing all three chains.

    For more info on timing chains click here:


    http://www.northstarperformance.com/36services.php

  16. #15
    RazorME is offline Cadillac Owners Member
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    Re: Rattle engine noise under acceleration

    Check your engine oil level - my SRX rattlings on acceleration or hard braking/cornering when it gets low due to excessive oil consumption.


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