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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 01-19-2013, 10:31 AM
three28iguy three28iguy is offline
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sound of pressure being released...

i've noticed when i come to a complete stop, my car sounds like it is releasing a burst of pressure (like a blow off valve on a turbo car), but no turbo under my hood. just wondering what it could be...

its a 328i
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  #2  
Old 01-19-2013, 11:18 AM
mr_bean mr_bean is online now
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Where's the sound coming from?
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  #3  
Old 01-19-2013, 11:24 AM
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Check your coolant level....
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  #4  
Old 01-19-2013, 11:51 AM
three28iguy three28iguy is offline
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coolant level was a little bit low, but hardly added any could it possibly be a leak? but how does that explain the pressure sound? and yes it sounds like it coming from the engine bay.
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  #5  
Old 01-19-2013, 01:43 PM
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CCV would be my first guess.
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  #6  
Old 01-21-2013, 01:23 PM
three28iguy three28iguy is offline
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i dont think it is because my car is never low on oil....
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  #7  
Old 01-21-2013, 02:52 PM
GoForthFast GoForthFast is offline
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What's the history of your CVV? Replaced ever?
Mileage on car? Short trip car?
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  #8  
Old 01-21-2013, 03:16 PM
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Do you have an after market intake?.
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  #9  
Old 01-21-2013, 03:16 PM
three28iguy three28iguy is offline
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no, it is stock
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  #10  
Old 01-21-2013, 03:19 PM
three28iguy three28iguy is offline
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idk if the CCV has ever been replaced; the car has 228k miles and i do majority of shorter trips in the fall and winter because i am a student that drives to campus 4 miles round trip.
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  #11  
Old 01-21-2013, 03:32 PM
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Quote:
Originally Posted by three28iguy View Post
no, it is stock
Quote:
Originally Posted by three28iguy View Post
idk if the CCV has ever been replaced; the car has 228k miles and i do majority of shorter trips in the fall and winter because i am a student that drives to campus 4 miles round trip.
good god if it's the original CCV that needs to be changed immediately among other things lol.
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  #12  
Old 01-21-2013, 06:10 PM
three28iguy three28iguy is offline
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hahaha i bought the car with 119k so i really have no idea what has/has not been replaced, i just assume nothing has ever been replaced... the only time i can fix things is in may, but for the time being i am just figuring out what exactly i have to replace. i am going to do a coolant sysdtem overhaul and CCV in may.
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  #13  
Old 01-21-2013, 06:19 PM
R. Cate R. Cate is offline
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Does that sound occur somewhere in the 0-10mph range also?
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  #14  
Old 01-22-2013, 05:26 AM
three28iguy three28iguy is offline
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yes it does sometimes when i first begin to accelerate...
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  #15  
Old 01-22-2013, 06:35 AM
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Originally Posted by R. Cate View Post
Does that sound occur somewhere in the 0-10mph range also?
Mine has been doing this since I bought the car... I never gave it much thought because I dont hear it most of the time when the radio is on. Do you know what causes it?
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  #16  
Old 01-22-2013, 02:36 PM
three28iguy three28iguy is offline
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yeah mine definitely makes the pressure being released noise when accelerating from 0-10mph today i listened for it to make sure
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  #17  
Old 01-22-2013, 03:28 PM
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Quote:
Originally Posted by three28iguy View Post
yeah mine definitely makes the pressure being released noise when accelerating from 0-10mph today i listened for it to make sure
This would be easy if your car was turbo or supercharged because that sound 99% of the time is a boost leak! lol. So maybe you have a vacuum leak? do you have loss of power?
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  #18  
Old 01-22-2013, 04:38 PM
three28iguy three28iguy is offline
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no loss of power the motor sounds great and runs smooth, it sounds like an atmospheric bov, but not nearly as loud
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  #19  
Old 01-22-2013, 10:06 PM
heztheone heztheone is offline
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i had that exact same thing on 2-year previously owned E46 325ci since day of purchase, left it as is
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  #20  
Old 01-23-2013, 06:34 AM
three28iguy three28iguy is offline
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Originally Posted by heztheone View Post
i had that exact same thing on 2-year previously owned E46 325ci since day of purchase, left it as is
hahaha yeah, i guess if i dont figure out what it is i'll just do the same, but it's still weird and doesn't make any sense...maybe over the spring when i replace my CCV i'll figure out a logical explanation for it, until then thanks for everyone's help. cheers.
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  #21  
Old 01-23-2013, 08:01 AM
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Might be a leaking check valve on the brake vacuum booster. If you shut down the car and wait until the hiss goes away, do you still have brake assist?
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  #22  
Old 03-13-2013, 05:46 PM
three28iguy three28iguy is offline
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i was reading on E46fanatics that the "Hisssssshhhhh" sound is a sign warn bearings in your water pump.
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  #23  
Old 03-14-2013, 03:17 AM
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I changed my waterpump after i got my car, and it has still made the hiss for the last 30K miles
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  #24  
Old 03-14-2013, 05:39 AM
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With the car parked, try doing a "bounce test" on the front fenders on both sides. A hissing sound, like releasing pressure, over small bumps or abrupt stops, was a warning that my front left strut was blown.
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  #25  
Old 03-14-2013, 05:57 AM
three28iguy three28iguy is offline
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its not the struts; it only hissees when i accelerate from 0-10mph or come to a complete stop
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