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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #351  
Old 10-30-2013, 07:02 PM
hemi_fan hemi_fan is offline
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Mein Auto: '99 323is
I just started getting a metalic squeaking noise during engine braking or reversing. The sound is metalic and related to wheel speed. It only occurs during engine braking or reversing, if I push in the clutch during decel it stops. Any thoughts on this? Took a quick peek to see if there was anything rubbing the driveshaft but didn't see anything close. I figure a wheel bearing would squeal during accel as well. Its likely a drivetrain component but I'm not sure how to narrow it down.
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  #352  
Old 10-31-2013, 08:37 AM
JayMac JayMac is offline
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Can you elaborate on the sound. Is it like a pad against a rotor? Is the pitch the same when it appears? Did it just start or is it an issue that might have been some thing that has slowly deteriorated?
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  #353  
Old 10-31-2013, 08:39 AM
JayMac JayMac is offline
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Mein Auto: what ever starts
If the car rolls in reverse is the sound gone
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  #354  
Old 10-31-2013, 09:14 AM
JayMac JayMac is offline
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Mein Auto: what ever starts
Do you have access to a suitable jack? Start simple and check your bearings and hubs for wobble. After thinking about it for a while I would guess drive shaft related so check all of that also.
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  #355  
Old 10-31-2013, 09:49 AM
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dc_wright dc_wright is offline
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Mein Auto: '96 328iC, '04 325Ci
The torque on the drive train is the same when you engine brake or reverse. I'd be looking at my engine and tranny mounts. You might have one that's deteriorated and it's allowing the engine/tranny to shift enough that a rotating part is able to contact something. It could be drive shaft to heat shield contact. The other place to look would be the cooling fan to the fan shroud, but I wouldn't expect that to make a metallic noise......
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  #356  
Old 11-01-2013, 02:42 PM
blk323 blk323 is offline
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Mein Auto: 1998 323is
Hi,

I have a rhythmic thrumming noise at 45-50mph that i can only hear at 45 50mph. mech thought it was a bearing but then they looked at bearings with an instrument and said theyre perfectly fine and its probably my tires... had tires looked at quickly by someone else and they said they have about 1/2 treadlife left... the car may need an alignment as it does seem to travel left/right semi aggresively when both hands are off wheel... any suggestions on the noise? Any sound clips of the "helicopter noise?"
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  #357  
Old 11-07-2013, 02:32 PM
hemi_fan hemi_fan is offline
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Location: Ontario
 
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Mein Auto: '99 323is
Quote:
Originally Posted by JayMac View Post
Can you elaborate on the sound. Is it like a pad against a rotor? Is the pitch the same when it appears? Did it just start or is it an issue that might have been some thing that has slowly deteriorated?
It is almost like a pad against rotor when your pad is extremely worn and the backing plate is digging into the rotor. The sound is the same as that, except less severe at this point. It does not happen when the car rolls in reverse. Only when there is reversing torque on the drivetrain. It also has a humming noise occasionally on acceleration. A noise deciphering website has me thinking pinion and/or stub-shaft bearings. Unfortunately I don't have access to a jack that can lift both rear wheels at the moment. I bought a house recently with a garage but don't move until Dec. 11th so I'm really hoping to nurse the car along until then and I'll probably just go crazy and swap LSD's, Guibo, CSB and check all mounts - unless I can pinpoint the issue before then.
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  #358  
Old 11-15-2013, 07:34 AM
hemi_fan hemi_fan is offline
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Mein Auto: '99 323is
Well... I broke down and picked up another LSD for the car. Had it installed and lo and behold, the problem still persists, although now its making a knocking noise on decel rather than screeching. Mechanic noticed the CV shafts did not move smoothly and also mentioned the rear U-Joint was worn... Going to be an expensive fix especially considering I already spent $725 on the LSD swap. I see Rockauto sells CV shafts cheap, will probably give those a shot and possibly pick up a used driveshaft.
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  #359  
Old 01-24-2014, 04:38 PM
Smoothops Smoothops is offline
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I got a very consistent clink coming out of the right rear shock area. Happens as i go over bumps or holes. Shock mount is fine, shock is new.
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  #360  
Old 01-24-2014, 09:09 PM
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hornhospital hornhospital is offline
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Mein Auto: 1995 318is / 1993 325is
Pull the wheel, examine the suspension parts for contact marks.
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1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
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  #361  
Old 01-27-2014, 09:33 AM
Smoothops Smoothops is offline
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Mein Auto: 1995 BMW 318i Cabriolet
I pulled the wheel, looked around, nothing looks worn or broken, no wear marks visible. I could not take a good visual of the RTAB though. The whole area looks like is has not been worked on for a while, the clay from the previous owner's access road is evenly stuck to every part. Minimal, if any rust on the suspension components. I have to run the car again, to listen closely to the rear right clunk.
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  #362  
Old 01-30-2014, 01:38 AM
dinamite_death dinamite_death is offline
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Mein Auto: 1996 320i
Hi, I have a 320i with a known bad diff (worn out bearings LOTS of play on output shafts-waiting for second one to show up) have the odd thump/clunk from rear, will do it on a strait smooth road, then over a bump, then drive over lots of bumps with no noise but the diff whining, hope its the diff but wanted to get a second opinion.
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  #363  
Old 01-30-2014, 09:58 AM
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hornhospital hornhospital is offline
D'oh, You kids!
Location: In the Grumpy Chair
 
Join Date: Jan 2008
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Mein Auto: 1995 318is / 1993 325is
Rear of the car in the air, safely supported

Large flat-blade screwdriver or small pry bar

Use tool to try and move bushings around.

If they move, replace them

If none move, look at your upper shock mounts. They can be torn enough to move under a single impact, then not move again until an impact of sufficient force dislodges them again.

Worst case is the upper shock mount connection with the shock tower/body is ripped.
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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