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Old 04-24-2015, 08:29 PM   #1
Lindsasa
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Loud vibration coming from back when accelerating. Sounds like coming from speakers?

While my boyfriends and I were driving his e36 on the highway (I know it's not an e46, but it's close!) it all of a sudden it made this loud vibration when we accelerated. Maybe around 4,000 rpm but stopped when we keep it under that. It almost sounds like it is coming from the speakers. Like when you unplug an aux cable and the plug hits the side of the input hole. Any thoughts? Maybe drivetrain? Or could some wires be hitting something?
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Old 04-24-2015, 09:05 PM   #2
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Quote:
Originally Posted by Lindsasa View Post
While my boyfriends and I were driving his e36 on the highway (I know it's not an e46, but it's close!) it all of a sudden it made this loud vibration when we accelerated. Maybe around 4,000 rpm but stopped when we keep it under that. It almost sounds like it is coming from the speakers. Like when you unplug an aux cable and the plug hits the side of the input hole. Any thoughts? Maybe drivetrain? Or could some wires be hitting something?
I don't how you manage more than one boyfriend AND a BMW. Good for you!

Can you record the sound and post to YouTube for us? Before that, look under the car and make sure nothing is hanging down.
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Old 04-24-2015, 10:34 PM   #3
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Haha! One boyfriend... Damn iPhone.

After we got off the highway, the noise got worse. He had an issue with the bolt the holds the drivetrain in place breaking a while ago, so we think it may be that. The noise is definitely coming from something rotating and hitting the bottom of the car. I will try and record the sound tomorrow.
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Old 04-24-2015, 11:06 PM   #4
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Sounds like it's likely the differential bolt (front of diff). If that's what was recently replaced, and if it's broken again, then it could be a sign that either the bushings are shot and need to be replaced, too, or that the bolt got slightly loose if no loctite was used. Get under the car and check to see if the bolt sheared off (part will still be in the differential) or if the bolt just backed out and dropped somewhere.

I'd get under there and diagnose the issue before driving around at all.
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Old 04-25-2015, 08:25 PM   #5
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You're totally right. Bushings were the next things we were going to replace, so that makes sense. We looked under the car and the bolt had tore in half...
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Old 04-25-2015, 09:38 PM   #6
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Getting the rest of the bolt out will be "fun," but do yourselves a favor and replace that diff bolt with a 10.9 grade bolt (and don't forget to use a bit of loctite when torquing to spec). The bolt is a well worth the $6!
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