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  1. #1
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    Whistling sound while accelerating

    Ok, my car started to make a whistling sound while accelerating. I heard it few weeks ago, but it was really faint, I didn't pay any attention to it. Its kind of whistle/whine at the same time, somewhere in the engine bay area, I believe. What might this be? I don't even know where to start. I'll do the search of the board I guess! But meanwhile, if anyone knows what it might be, pls post here.

    2000 2.3 AT 47K Miles

    TIA
    Alex


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    might be an air leak around the windshield seal...

    i have the same issue, on and off.... i've read several places (here included) that it might be an air leak in the windshield seal... i recently bought an air compressor, so I'm going to try to reproduce the problem with an airgun.

  3. #3
    Brian
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    Re: Whistling sound while accelerating

    if it is only when accelerating i would look at the air intake box, make sure there isnt anything stuck in it, make sure filter is clean, replace it if it has a bunch of miles on it, they are cheap like $15.


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    Check your belts, sounds like they're due

    for replacement...

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    Re: Whistling sound while accelerating

    Air filter replaced 2K miles ago, but i will check the airbox.

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    Re: might be an air leak around the windshield sea

    The sound appears only when I press accelerator pedal, even when I drive the car and take my foot off the gas, the sound goes away, but reappears once I press the pedal.

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    Re: Check your belts, sounds like they're due

    All belts and tensioners were replaced leas than 1K miles ago, can't be belts!?

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    Brian
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    Re: Whistling sound while accelerating

    take out the filter shake it off to make sure nothing is in there and put it back, maybe it just got slightly out of place and that could cause a whistle.

    is it under any type of acceleration? just really quick acceleration?

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    Any type of acceleration, whenever I press gas ped


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    even when going under 10mph?


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    one TSB indicated common issue with Big O-ring...

    ..the one that seals the airbox to the intake tube/maf sensor..it's prone to twisting and can seal poorly if not properly seated(they also get old!)...worth a looksee in any case..symptom of faulty seal sounds just like your description..Cheers! dk '97 2.8 bg R

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    Especially at 10mph - the faster I go the less...

    audible the sound gets, most likely because it is muffled by the sound of the engine, but it is present an any speed. It really starts to worry me!

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    That's a good piece of info! I'll check the O-ring


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    Alternator bearing???

    Have somebody rev the engine while you are under the hood and see where it comes from.

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    Check t he rubber boot/hose between the MAF and

    the throttle body. I had the same problem. Big hole in the rubber. Installed a new one, fixed it. Car runs better as well.


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    Some new info

    Well, the sound is still there. Checked O-ring, seal, alternator bearing, belts, tensioners, even water pump. Don't know what it is! Its not getting worse, but not stopping either. I also noticed increase in fuel consumption, don't know if this is somehow related - was getting about 200 miles per tank (spirited driving, city exclusively), no get 165-170! The only change - new tires. Car feels the same, not sluggish or anything, but that sounds has me worried. What else could it be?

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    the gas mileage loss could be related to tires...

    ..if you lowered pressure, you'll lose mpg's... if you're still whistling, seems possible you may have a partial vacuum leak...check intake mounting nuts..and any vacuum related fittings(brake booster/egr tube/egr valve vacuum line/ASC boot/ASC fittings/etc)..i'd hook up a vacuum guage and see if it registers steady reading at idle,17-20"hg(very low reading,3-9"/some hunting is a probable leak)...other whistles: windscreen seal(lower edge usually), door seal(lube), hood seals(adjust ht), low PS fluid...hope you find it! Cheers! dk '97 2.8 bg R

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    one other thought..check your fan blades...

    a cracked one could whistle, until it breaks...Cheers! dk '97 2.8 bg R

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    Will look into that - thanks Dane!


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    Yes, this is common whistling cause, and a PITA

    to locate, as it is usually either a split in one of the folds or at one of the seams at a hose junction. You either need "clean smoke" to see if sucked in, or need to remove the whole rubber elbow and check for splits. A drop in mileage usually points to this area as more air than is measured is going in so you are running too lean. Another hint is if it is worse while accelerating and still there but less while cruising with throttle steady.

    Perry Esposito- Virginia plate"99 E36 7"

    99 2.3, 5 sp, 57k miles, This stuff is listed to allow you to ask me questions about the effectiveness/cost/difficulty of the mods, not to be vain. Boston Green, self installed: new OEM Black top 5/5/06, M Coupe Dot leather Nappa seats and M steering wheel, Stewart High Performance Water pump, Whalen Shift Machine and seat bushings, clutch stop, Koni adjustable Sports all around, Ground Control rear shock mounts with Stygar reinforcement plates, magnetic oil drain plug, CL Strong Strut & CL Butt Strut, rear subframe bushing stuffers, Conforti CAI'ed and Sharked, Double Spoke 47 16" wheels w/ Goodyear Eagle F1 GSD3 tires, Porterfield R4S pads all around, Bosch +4 Plat plugs, Legend5 Silver painted calipers, front wheel BMW mudguards, Hella Projector Z headlights, Gary's Mirror adapter w/Gentex 115 electrochromatic mirror w/map lights, LeatherZ door armrest pads, Z3 Solutions air dam guard, OEM trunk buttonfinger lift, UUC clutch pedal bushings, Euro wiper relay w/ adjustable intermittent timing, Ungo MS8300 alarm w/keyless entry/SpaceshieldIII/extra one touch windows up & lock w/o alarm, seat tilt mod (removed), Drivers side cargo net, Blau Toronto w/ Thummer and PA2100 amp, Infinity 50.5cs 5.25" components & 452i 4" speakers, Kenwood wOOx sub, Xpel (3/01 - 6/06 front bumper, headlights, fogs, mirrors, rear fenders, replaced with Roadblock, prof installed, except fogs), Battery Mat, Roadster Accessories Polycarb windscreen

    http://www.ecarter.net/z3/toychest/tamiya/102.jpg


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