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Old 11-27-2010, 01:43 AM   #1
sergio
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Clunk rear passenger on takeoff

Guys, on my 323i 2000 I'm getting a clunk sound on takeoff only. My mechanic checked by rear bushings and differential back bushings and all looks good.

What else can it be? We are very puzzled.

If any bushings would have to be chnaged, do I take a chance and go with rear passenger bushing first? It's a PITA job.

The clunk is starting to annoy me....

LMK...
Sergio
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Old 11-27-2010, 08:46 AM   #2
mp333
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Rear springs.... They tend to crack.

Last edited by mp333; 11-27-2010 at 08:48 AM.
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Old 11-27-2010, 08:58 AM   #3
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yup, calling the rear springs as well but I'm not sure why it would only be on takeoff?
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Old 11-27-2010, 09:31 AM   #4
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car would most likely sag if the spring is broken, and you'd notice an uneven ride.

check for shot RTAB(rear trailing arm bushing)
check for cracked diff carrier (subframe) mount crack
you said the diff bushing is good, so its most likely one of those 2.

just to be sure, check shock mounts too.
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Old 11-27-2010, 09:47 AM   #5
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Old 11-27-2010, 10:38 AM   #6
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I would check the chassis where the rear subframe bolts up. Could be cracks.
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Old 11-27-2010, 08:24 PM   #7
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Guys, thanks for tips.

Yes, car does have very uneven ride. I thought it was related to tires (end of life and bad wear). The car does pull all over when driving on highway.

The clunk, only happens when I'm at complete stop and takeoff in 1st gear.

I will let you know status.

Car has original springs, with 155,000 miles (250,000km).

Take care...
Sergio

Quote:
Originally Posted by snikwad View Post
car would most likely sag if the spring is broken, and you'd notice an uneven ride.

check for shot RTAB(rear trailing arm bushing)
check for cracked diff carrier (subframe) mount crack
you said the diff bushing is good, so its most likely one of those 2.

just to be sure, check shock mounts too.
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Old 11-27-2010, 11:14 PM   #8
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My thought is the rear differential or its connection to the driveshaft is having a problem.

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Old 11-28-2010, 12:33 AM   #9
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im having the same symptoms as you. clunk on acceleration from dead stop as well as clunk when breaking to a full stop (both must be done rather quick) so the weight is shifted. rear subframe was checked by BMW and they said it was ok. gotta get under the car and inspect what others suggested. lmk when u find out what it is.
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Old 11-28-2010, 12:35 AM   #10
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by clunk, do you mean that knocking like noise ?
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Old 11-28-2010, 02:33 AM   #11
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oh yes, i was trying to remember too, check your e-brake adjustment too.
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Old 11-28-2010, 04:27 AM   #12
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oh yes, i was trying to remember too, check your e-brake adjustment too.
I have a Loud Thunk in my drivers rear when im backing up and then use the brakes...CLUNK! Could that be an e-brake prob? Always figured it to be a bushing, or joint?
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Old 11-28-2010, 04:29 AM   #13
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mine too, but i also have a cracked subframe/carrier mount, i think the too are related, but i remember hearing said clunk before the crack, when i tried to move before dropping the e brake.
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Old 11-28-2010, 04:36 AM   #14
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Dont wanna ramble on, but this is relevant.. When im on a slant or slope and the car is completely stopped, if i put the E-brake on (Properly,not retarded) and let my foot off the brake, the car rolls about a good 3 to 4 inches! Then stops. Never tried to see if it would roll the opposite way, kinda like back and forth though.. prolly would be good to know. But always thoght that wasnt quite right. The clunk has goten louder and louder since ive owned the car and is really just, ugly sounding..
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Old 11-28-2010, 04:39 AM   #15
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^ yep, exactly what mine does. i think thats just the brake pad setting in. but check subframe still
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Old 11-28-2010, 05:56 AM   #16
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im having the same symptoms as you. clunk on acceleration from dead stop as well as clunk when breaking to a full stop (both must be done rather quick) so the weight is shifted. rear subframe was checked by BMW and they said it was ok. gotta get under the car and inspect what others suggested. lmk when u find out what it is.
It sounds like a diff problem.. think any slack or play between those gears is under massive force, thus like knockin on a door. bigger gap, louder knock!
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Old 11-28-2010, 11:05 AM   #17
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Did any one mention Subframe?? Just saying thats what my car was doing. Only on take off and if i stabbed the gas!!! Have you had the subframe inspected?

Link to my repair. Took us all day and night....
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Old 11-30-2010, 10:20 PM   #18
sergio
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Subframe inspected and all ok.
My mechanic wants to put car on alignment machine and check clunk....
Stay tuned...
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Old 11-25-2012, 08:57 AM   #19
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Ok, we found the clunk on take off. Here is what we did to find where clunk was coming from:
1. We put car on lift
2. We put had brake on
3. We put a driver in car while 4 wheels were off the ground
4. We started car
5. We popped clutch slowly while in 1st gear without stalling car
6. Clunk noise came from Differential area

3 bushings to be replaced on the differential housing.

My Mechanic, confirmed that this is a PITA job!!!!!

While we are there, we will replace all seals on Diff box, and replace fluids there too.

Any ideas on this type of job. Special tools are required for job too.

Wow, I just realized that my original post was back in 2010, and in 2012, clunk still not fixed!!!!!! I must have too much patience

Take care!
Sergio

Last edited by sergio; 11-25-2012 at 09:42 PM.
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