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The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 06-04-2019, 04:10 PM   #1
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2004 325xi driveshaft(?) Noise on deceleration. (Help!)

This is my first post here, been browsing for advice since I bought my XI with 199k on it and changed the valve cover gasket. I absolutely love this car and want to keep it to at least 222,222 miles (4-5k away!. for sentimental value I guess. Lol)

So, down to business. I had noticed a vibration on deceleration starting to appear and get louder with more use found that the front passenger CV boot was torn and there was grease everywhere, so I decided to buck up and replace it (with some great posts here to help through what would have been a 2-3+ hr struggle) but the vibration hasn't changed at all. It happens anytime I release the gas and is especially loud between 30-10 MPH and practically goes away when you're on the gas. At first when i noticed the sound i thought it was coming from the front left but now it sounds like it could be underneath in the center. The thing is, anytime I read stuff about problems with the driveshaft/CSB/guibo it says that there's vibrations during acceleration, which is when mine goes away. Would love some help from someone who has experience with this. Is there anyway to diagnose it without taking the exhaust off and looking? Thanks!
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Old 07-01-2019, 09:13 AM   #2
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Update. I have replaced the CSB because the rubber was obviously torn, so I believed that was the issue. Not the case, apparently. Still making the noise on deceleration. The gumbo disc appeared to be in good condition, and all of the U-joints (front DS and rear DS) seem to be good as well. I dont know how to test if perhaps the driveshaft has gone bad, and would still really appreciate help!
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Old 07-01-2019, 11:55 PM   #3
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My Ride: 330xi
Year: 2005
Transmission: automatic 5l40
I had the same issues you are and replaced the guibo and CSB, but still didn't fix it. Looked at my driveshafts and both appeared to be alright, meaning no weights missing or bent somehow. Finally replaced the rear driveshaft and that took care of the problem. I couldn't find anything wrong with it after it was out. Just make sure the two rear shafts are lined up correctly if you go that route.
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Old 07-02-2019, 09:41 AM   #4
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Location: CT
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My Ride: 325xiT
I had a loud noise (more of a whine) only on decel (at all speeds), silent when on the gas - check for play in the pinion bearing on your front diff.

If that bearing is bad, I'm pretty sure BMW doesn't sell it as a replacement. I found this out after fighting/cutting my bearing out. I was fortunate enough to find a used front diff locally and just replaced the whole thing.
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