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#1
11-24-2016, 02:13 PM
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What is this noise?
3.0i 2005 with about 229K miles - no rear air suspension. Thank you! Nick Last edited by nikolai; 11-25-2016 at 11:24 AM. 
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#2
11-25-2016, 06:28 AM
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I can't think of any "compression" noises from the back other than air bags, compressor or tyres. The knocking is of course the result of the loss of compression. Have you tried lying under the car to listen/see...maybe that will pinpoint the location of the noise?
Sent from my SM-G900F using Tapatalk
__________________
BMW X5 E53, 4.8iS - 2005 Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam 4-Corner Air Suspension - Converted to BC Coilovers
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#3
11-25-2016, 10:01 AM
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Dies your X have rear air suspension?
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#4
11-25-2016, 11:19 AM
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I should have mentioned originally that I do not have rear air suspension, so that certainly eliminates one potential cause.
I have tried to crawl under the car a bit and pinpoint, but this sound clip is really the best I could do. I think it sounds like it's coming from slightly in front of the rear passenger tire area, and about 1-2 feet towards the center of the vehicle (underneath) - I'm sorry I can't provide a more accurate description than that. Last edited by nikolai; 11-25-2016 at 11:39 AM.
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#5
11-25-2016, 05:24 PM
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Since you dont have air suspension I can't think of any other pressure line/reservoir or any of the sort in the location you're describing. Perhaps brake lines but you'd get a warning in the dash for that. I'm baffled.
Sent from my SM-G900F using Tapatalk
__________________
BMW X5 E53, 4.8iS - 2005 Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam 4-Corner Air Suspension - Converted to BC Coilovers
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#7
11-27-2016, 12:01 PM
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Quote:
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#8
11-27-2016, 04:09 PM
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Maybe get yourself a piece of hose that you can hold to your ear and prob around with the other end when it's happening to try and pin point it. It's good that it happens often because it will be much easier to pin down.
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me)
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#9
11-27-2016, 04:13 PM
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just throwing this out -
we have a "vapor leak detection pump" as part of the fuel system. Maybe after shut off it empties and yours is getting noisy?? I believe its under/close the tank (under back seat).
__________________
2004, X5, 3.0, 202k+
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#10
11-27-2016, 04:33 PM
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Quote:
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