3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
but mine come from the enginee bay, i lifed up the bonnet and got my mate to turn the engine off and when he did it then a hisssss came out, any thing wrong , any thing need changing like a fliter or any thing
It may be coming from the intake. You tend to hear it more from aftermarket intakes, but it may be possible from the OEM one. I've never heard it on the Bimmer, but I'm used to hearing it on my other car and don't mind it.
"but mine come from the enginee bay, i lifed up the bonnet and got my mate to turn the engine off and when he did it then a hisssss came out"
I'm pretty sure some of the blower components are IN the engine bay, just under the cabin air filter. Try to pinpoint where the hiss comes from. If it sounds like it's coming from someplace near the center of the car, towards the firewall, it's probably just your vents. If it's towards the front, check the air intake.
"if it come from the vents near the firewall is this normal,,,,,,"
Well, it happens in my car on a routine basis (not always, but not alarming when it does). It only happens when I turn the car off and I hear a "hiss" from the vents. Since I have not recently installed a Diamondback Rattlesnake in my heating coil, it must be the last bit of air being flushed through the vents.
The noise is normal. It is just compression bleading back into the intake from a cylinder where the valve didn't close all the way before the engine was shut off. There is nothing to worry about because 99% of the cars on the road do it, and like someone else said the noise is louder with aftermarket intakes because the stock noise baffles are not there anymore.
I had the same problem on my e46.When I stop the car I was hearing a terrible noise coming from the engine,for a few seconds and then stopped.
I heard that noise also when I drove off on first gear.After checking in the service they told me that the problem is in broken or torn hose.
Here is a link about my problem: http://www.realoem.com/bmw/showparts...11&fg=15&hl=10
beyond the potential broken broken hose.. the crankcase vent valve (part #1 in your link versace). These things are notorious for making funny noises including the hissing sound you hear. The hissing sound is coming from pressure built up inside the crankcase. Have the vent valve replaced and your noise should go away. The other thing you might want to check is your air filter. Make sure the air box is sealed properly and that the air filter is seated properly. Any sound of pressure bleeding off from the engine will be amplified if the air filter isn't seated or the box isn't completely closed. Ironically, I think there is a thread about this just recently.
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