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Thread: Engine/car loud?

  1. #1

    Engine/car loud?

    Hello all,

    Here's a question that a mechanic I went to forgot/didn't know how to address.

    My car sounds like it's always cold while driving now, even when it's not.

    When I start my car, I of course let the idle drop before driving off. On the rare occasion that I don't wait and drive while it's still a little cold, the engine sounds..loud. It has a sort of loud whoosh/roar. I'm not exactly sure how to describe it. I mostly hear it in first gear, ascending with RPMs, getting louder as I accelerate SLOWLY.

    I just got my car back from some repairs..I think it's been sitting a while. Now, when I drive, it's always sounding like it's cold in this manner. It idles very smoothly. Any ideas what it could be?

  2. #2
    Join Date
    Mar 2016
    Location
    Madison, Alabama
    Posts
    209
    Unplug the secondary air pump.
    Family that races together stays together
    2005 330Ci 6MT SGM (x2)

  3. #3
    Join Date
    Jan 1970
    Location
    Branford, CT
    Posts
    14,789
    Yours is automatic, right? I think those are mechanical fans?
    If it's an electric, maybe it's stuck at a higher speed. I'd check the fan switch for that. If it's mechanical, then.. I don't know.
    BP
    2005 330i ZHP / 6MT
    Connecticut Valley Chapter
    Patroon Chapter
    Imolarot / Naturbraun


    It's not the car you drive, it's how you drive it.

  4. #4
    Quote Originally Posted by PetesZ View Post
    Unplug the secondary air pump.
    I think this was it. I unplugged the pump and the noise seemed abated.

    This car has always had issues with the secondary air system..more than likely the culprit is yet to be found.

  5. #5
    Join Date
    Mar 2016
    Location
    Madison, Alabama
    Posts
    209
    The cover plate is $10. You will have a CEL light that can be coded out

    https://www.ecstuning.com/b-genuine-...IaAqk9EALw_wcB

    Or you can get a working one to keep it stock.
    Family that races together stays together
    2005 330Ci 6MT SGM (x2)

  6. #6
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    3,698
    Where are you located Usinjin that a secondary air pump would turn on in August?
    CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump....
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  7. #7
    Join Date
    Feb 2013
    Location
    Austin TX
    Posts
    4,770
    He's in Austin TX.
    2005 IR / black / 6MT
    146,000 miles

  8. #8
    Join Date
    Mar 2016
    Location
    Madison, Alabama
    Posts
    209
    Yeah. Here in the south it gets down right cold in the mornings was nearly 69 70 this morning.

    You can have the one I pulled off the race car for a small fee plus shipping. But I would just put a plate on it. On the cheap you can find those on x3 if you have a u pull it salvage nearby.
    Family that races together stays together
    2005 330Ci 6MT SGM (x2)

  9. #9
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    3,698
    Weird, my secondary air pump turns on ONLY when it's near freezing, it is loud, as op describes and then within a minute it shuts off. Always thought it's rôle was on very cold stats.
    CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump....
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  10. #10
    Join Date
    May 2011
    Location
    Charleston SC
    Posts
    5,491
    It's role is to preheat the catalytic converters so they can do their job right away on cold starts. Interesting that with the MS45.1 DME, the SAP has a MAF to monitor air flow.

    If you eliminate the SAP system, you'll need to code out the SAP and the secondary O2 sensors... same as if you were putting headers on the car.
    Also, If your state has emissions tests, It will most likely fail even though you have cats due to the fact that those two entries will be non-functional when they read from the OBDII port.
    Dinan CAI &Throttle body, ESS Tuning TS2, Bimmerbrakes gen3 headers, UUC SSK & DSSR. Achilles oil pump, VAC oil pan baffle
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    H&R sport springs,
    UUC sway bars, BMW Perf. Rotors, UUC SS brake lines, Hawk HPS pads, CSL replica wheels,
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