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General E46 Forum
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Old 08-27-2016, 04:37 PM   #1
330Spartans
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Knocking /popping sound from rear.

So here I am still with the same problem. When ever I turn on a driveway on an angle and as the front of thr car goes up in the driveway I start hearing knocking / popping noise from the back, it's usually 2-3 knocks. It almost feels like when you try to brake a big peace of wood and as it's bending it starts making popping noises. I ve been to diffrent mechanics. None of them can find what is the problem. Suspension seems to be fine car isn't bouncy. They did sway bar bushings and links and lubricated them . And the noise went away for like a day or two and it came back slowly at first beeing not so loud and not so frequent. But now it's back to how it was before. So I'm wondering how is it possible that they changed the links and the noise went away and than now it's comming back. I've been trying to find this problem for almost half a year now and nothing. It's basicly when ever the car leans on a side if I take a sharper faster turn and when the weight transfer from one side the the other I can hear the noise. Or turning on to driveways.
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Old 08-27-2016, 07:23 PM   #2
YoitsTmac
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Subframe torn? :eek!: I'm thinking so


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Old 08-27-2016, 08:07 PM   #3
330Spartans
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But if it would be subframe, than why did the noise go away after changing sway bar links and lubricating sway bar bushings. And than noise started comming back and getting worse and worse after 2-3 days
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Old 08-27-2016, 09:39 PM   #4
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I'm not sure. Perhaps the cracking and popping could be from the anti-roll bar added stiffness to the subframe and greasing it just let the bar flex without noise until it was gone? I'm not saying I'm right, but it wouldn't hurt to inspect the subframe
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Old 08-28-2016, 08:06 AM   #5
330Spartans
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I'll get it checked for sure. Mine is a 2005 330ci did that year still fall in the subframe issue?
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Old 08-28-2016, 11:17 AM   #6
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Quote:
Originally Posted by 330Spartans View Post
I'll get it checked for sure. Mine is a 2005 330ci did that year still fall in the subframe issue?
People can debate this all day, but I actually think BMW did something about the subframe issues in 2004. It's still worth checking out in my opinion.
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Old 08-28-2016, 11:49 AM   #7
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Mine makes popping sounds too. It's very annoying. My subframe mounting points are in perfect shape. I should know since I took the entire thing out to put in new bushings. I've gone under and retorqued everything. Not sure what else I can do. I'm thinking maybe it's the spring pads. I'm going to spray them with some silicone lube and see if they slip into position or stop popping.

BMW did a subframe modification around 2000-2001.
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Old 08-28-2016, 11:59 AM   #8
330Spartans
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Originally Posted by WDE46 View Post
Mine makes popping sounds too. It's very annoying. My subframe mounting points are in perfect shape. I should know since I took the entire thing out to put in new bushings. I've gone under and retorqued everything. Not sure what else I can do. I'm thinking maybe it's the spring pads. I'm going to spray them with some silicone lube and see if they slip into position or stop popping.

BMW did a subframe modification around 2000-2001.

Yes it is very annoying mine seems to be comming from the left rear side. Please let me know if you find out what it is. Problem is when ever I take it to a mechanic they don't like to spend too much time on cars they look at it than they start guessing or tell me they found it but then turns out it wasn't it.. So I'm trying to figure it out myself. Before spending more money on things that don't even need ti he changed.

I went to BMW and I told them about it. They said it could be body flex.... They also told me that they can put microphones under the car in diffrent areas and parts this way they might be able to tell me where the noise is comming from. I might try that however I don't know how accurate would be and if they couldn't actually find it that way.
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