Need help!!! "popping" when pushing in clutch - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-20-2004, 07:07 PM
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1992 E36 325is 5spd

So this occassionaly happens (although just started happening...AND I just bought the car 3 weeks ago) in 1st gear and leaving second.....seems to happen sub 4k shifts when I push in the clutch I hear a "pop" or "thunk", first thought it was coming from the front center but now it might be coming from the rear...I just don't know.

What are some possibities?? Mounts? Bushings? Rear subframe failure?? :

If it is the dreaded rear subframe failure how long do I have before serious damage is caused?? I'm super tight on money as I just bought the car and still owe my parents $1,200...so if it is a problem I won't be able to address it until winter break (december).

The car has a "limited" warranty that covers drivetrain and "carrier case" axle carrier etc..., would sub frame failure fall into any of those categories?


Thanks for any help you guys can provide
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#2 (permalink) Old 09-20-2004, 07:56 PM
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check your slave cylinder.

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#3 (permalink) Old 09-20-2004, 10:00 PM
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what is it and how do I check it??

would a bad slave cylinder cause "thumping"

to be more specific (just got done driving the car) it sounds like the clutch itself is "thumping" like you're dumping it, only it's when I'm pushing in the clutch....but it's the same sound as when you let it out too fast.
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#4 (permalink) Old 09-21-2004, 08:55 AM
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coincidently I bought my car 3 weeks ago to and i have been noticing a similar "thump" when i am changing gears. But in my case it isn't when the clutch is engaged/disengaged, it is when I change gears. The shifter seems a little stiff and notchy too but overall the clutch and tranny seem to be working fine. Just that THUD when i physically move the shifter into gear..I have noticed it going into 1st, 2nd, & reverse..it may be doing it at higher gears but the enigine and road noise are too loud for me to notice. Also it doesnt make the noise everytime..maybe 1/3rd of the time it will thud..do i have a major problem on the horizon or what?

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#5 (permalink) Old 09-21-2004, 11:27 AM
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clicking/popping could be a broken tooth on teh presure plate, but thats talking the worst it could be. i think there could be a chance you have a problem with the actual problem with the slave like said before, my guess is that the clutch is not original and usually when the clutch is replaced its not always quite the same. i bet the slave is ok but still gives a slight vibration, ive seen it before a few times.

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#6 (permalink) Old 09-21-2004, 12:15 PM
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I had a friend with the same problem......

The spot welds on his rear subframe became fatigued and started separating from the unibody. It got to the point where his rear tires were rubbing on the inner fender due to the rear end not being supported any longer....a very dangerous situation to say the least. He almost wrecked his car on an onramp. Those first few years of the production on the E36 are the WORST EVER. He ended up trading his E36 for a case of Lucky Charms and a few gallons of milk. He was stoked.

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#7 (permalink) Old 09-21-2004, 12:52 PM
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now I actually notice it most when downshifting, and I hear a "thump" on the rear windown....if I downshift and slip the clutch it doesn't happen....but say I jump from 3rd to 2nd and dump the clutch I can hear the "thud"

Edit: BTW i'm BDI FC, accidentally posted under my friend's SN last night when I was at his house.
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#8 (permalink) Old 09-21-2004, 01:54 PM
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Wow, there's a lot of people having what seems to be rear sub-frame failures. Jack up your car and check to see if the mounts around the diff are cracked. They should be very obvious.

When going from 1st to 2nd hear, push down on the clutch and shift into gear quickly, if you hear a thud it is most probably the rear sub-frame. Now, when shifting from 1st to 2nd this time, wait 2 seconds, then push it into gear softly, if you don't hear a thud, it's the sub-frame for sure. The thud is actually the differential hitting against the chassis.

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#9 (permalink) Old 09-21-2004, 04:05 PM
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while youre at it, check your transmission mount. that also start clunking or thumping
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#10 (permalink) Old 09-21-2004, 06:10 PM
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Quote:
Originally posted by Autotechnica@Sep 21 2004, 12:54 PM
Wow, there's a lot of people having what seems to be rear sub-frame failures. Jack up your car and check to see if the mounts around the diff are cracked. They should be very obvious.

When going from 1st to 2nd hear, push down on the clutch and shift into gear quickly, if you hear a thud it is most probably the rear sub-frame. Now, when shifting from 1st to 2nd this time, wait 2 seconds, then push it into gear softly, if you don't hear a thud, it's the sub-frame for sure. The thud is actually the differential hitting against the chassis.
[snapback]196030[/snapback]

there has to be other things that would cause a thud rather then sub-frame failure....that is a pretty extreme failure...I know my old infiniti G20 made a thud and it was just a bad mount. I've heard of the diff. bolt backing out...could it be that??

I don't know but just because it makes a thud i'm not going to assume the worst (a $2k job)...there HAS to be other things that could cause that.
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#11 (permalink) Old 09-21-2004, 08:47 PM
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Quote:
Originally posted by SDSUe36+Sep 21 2004, 05:10 PM--><div class='quotetop'>QUOTE(SDSUe36 @ Sep 21 2004, 05:10 PM)</div><div class='quotemain'><!--QuoteBegin-Autotechnica@Sep 21 2004, 12:54 PM
Wow, there's a lot of people having what seems to be rear sub-frame failures. Jack up your car and check to see if the mounts around the diff are cracked. They should be very obvious.

When going from 1st to 2nd hear, push down on the clutch and shift into gear quickly, if you hear a thud it is most probably the rear sub-frame. Now, when shifting from 1st to 2nd this time, wait 2 seconds, then push it into gear softly, if you don't hear a thud, it's the sub-frame for sure. The thud is actually the differential hitting against the chassis.
[snapback]196030[/snapback]

there has to be other things that would cause a thud rather then sub-frame failure....that is a pretty extreme failure...I know my old infiniti G20 made a thud and it was just a bad mount. I've heard of the diff. bolt backing out...could it be that??

I don't know but just because it makes a thud i'm not going to assume the worst (a $2k job)...there HAS to be other things that could cause that.
[snapback]196287[/snapback]
[/b][/quote]

Not extreme at all. It's a very common failure on E36's. There's no point in speculating what it could be, you might as well have it checked out. Nobody can hear this thud but you. However, if I heard it in person I would know whether or not it was the sub-frame. Check out the other posts, there are at least 2-3 other people having the same problem.

Personally, I know countless individuals who have had this problem as well. Whether you know it or not, sub-frames twist and flex when cornering and under accleration reguardless of what speed you're going. There is also metal fatigue. The '93 and earlier model rear sub-frames are a weak design and actually I consider it to be a design flaw. Why else would BMW have come out with reinforced rear sub-frames after '94? Obviously there was something wrong in the first place.

Bry

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#12 (permalink) Old 09-21-2004, 08:59 PM
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With no reinforcement.
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#13 (permalink) Old 09-21-2004, 09:00 PM
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reinforced 94+
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<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
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