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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 01-29-2006, 11:09 PM   #1 (permalink)
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Click, click, click....

Recently my car has been making this annoying clicking sound as I accelerate. It doesn't make the sound if I keep a constant velocity. Originally, I thought it may have been the guibo, but the sound comes from the rear of the car. It may be a center ball bearing, or - hopefully this isn't the case - the entire final drive unit is out.

So, I have several ideas of why it may be making this sound, and I went ahead and took the carburetor to muffler part of the exhaust off. I'm in the process of POR-15'ing it so I will never have to worry about rust again, so I have time to wait for a constructive response. Here's my question:

How do I check these rubber parts of the driveshaft? What's the determining factor of whether the part has gone sour or not? How can I locate the actual problem in the driveshaft?

Armed with a Bentley manual, I'm sure I will be able to comprehend even the most technical advice, so don't feel shy about flexing your e30 know-it-all! I need all the input I can get!!!
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Old 01-29-2006, 11:36 PM   #2 (permalink)
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I've still to paint it, but so far it's looking pretty good to me! Any suggestions?

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Old 01-30-2006, 10:39 PM   #3 (permalink)
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The clicking sound could be from loose rear end flange bolts, or wore out CV joints. Or worse the rear end itself.
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Old 01-31-2006, 12:47 AM   #4 (permalink)
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The clicking sound could be from loose rear end flange bolts, or wore out CV joints. Or worse the rear end itself.
Where can I find the flange bolts at?
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Old 01-31-2006, 01:12 AM   #5 (permalink)
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That dent will dog your performance :-)

Is the sound faster with engine RPM? Or vehicle speed?
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Old 02-02-2006, 03:53 PM   #6 (permalink)
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The faster I go the clicks will proportionally get faster. Sometimes it'll fade away, but most of the time it just clicks faster.
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Old 02-04-2006, 03:14 AM   #7 (permalink)
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Well first you can check the cheap stuff, like a leaf or twig or loose clip in the brakes.
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Old 02-04-2006, 06:44 PM   #8 (permalink)
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That dent will dog your performance :-)

Is the sound faster with engine RPM? Or vehicle speed?
That "dent" is put there for clearance past the rear suspension housing.

Sounds more like bearings are going bad, and if you hear it more so when you downshift your differential may be bad.

The rubber flex joint is right off the back of the trans if you can see cords or cracks it's bad, and when it and or the center drive shaft bearing mount goes bad they'll rattle the fillings out of your head when you hit the gas. You have to pull the heat sheld off from above the exhaust pipe to see the center drive shaft mount, the rubber gets torn from use.

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Old 05-21-2006, 03:27 AM   #9 (permalink)
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i have a click click click when im sitting and reving the engine but its coming from the htr matrix i have no idea what that is but you could try that
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