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E34 (1989 - 1995)

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  #1  
Old 12-22-2012, 08:52 AM
ecullen ecullen is offline
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525i engine noise

My 1995 525i has 300k miles and still runs great. Recently the car in making a constant "thumping" noise. I have isolated it to the engine, but have no idea what could be and it has not impacted performance.
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  #2  
Old 12-22-2012, 09:14 AM
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BMR_LVR BMR_LVR is offline
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Quote:
Originally Posted by ecullen View Post
My 1995 525i has 300k miles and still runs great. Recently the car in making a constant "thumping" noise. I have isolated it to the engine, but have no idea what could be and it has not impacted performance.
Can you post a video of it? Sounds are very hard to diagnose over the net without a video. We'll need more details as well.

Does it do it when driving or can you hear it when the car is stationary? Does the frequency of the noise vary with engine RPM?
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Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold


Last edited by BMR_LVR; 12-22-2012 at 09:15 AM.
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  #3  
Old 12-22-2012, 09:51 AM
ecullen ecullen is offline
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Video will be posted next. Yes it is tied to rpm and it can be heard when stationary.
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  #4  
Old 12-23-2012, 03:59 PM
ecullen ecullen is offline
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The video of the noise is posted to YouTube..."Mystery noise 1995 BMW"...i cannot upload to this site.

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  #5  
Old 12-23-2012, 04:29 PM
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BMR_LVR BMR_LVR is offline
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Quote:
Originally Posted by ecullen View Post
The video of the noise is posted to YouTube..."Mystery noise 1995 BMW"...i cannot upload to this site.

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I just looked for the video and couldn't find it. Can you post the link?
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #6  
Old 12-23-2012, 07:57 PM
ecullen ecullen is offline
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  #7  
Old 12-23-2012, 09:58 PM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Sounds like a cracked pulley on a belt driven item.
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  #8  
Old 12-23-2012, 11:38 PM
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luckydog luckydog is offline
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hopefully ,maybe the fan hitting the shroud.Ill agree maybe a bad fan pulley: ?

Last edited by luckydog; 12-25-2012 at 08:48 PM.
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  #9  
Old 12-24-2012, 07:39 AM
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BMR_LVR BMR_LVR is offline
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Agree with the above two, but its kinda hard to tell with the hood closed. ecullen, is it possible for you to take a vid with the hood open and try to aim the camera where the noise seems to be coming from? There's a lot going on under the hood that could be causing the noise.
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #10  
Old 12-24-2012, 01:40 PM
ecullen ecullen is offline
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  #11  
Old 12-24-2012, 03:11 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
Quote:
Originally Posted by ecullen View Post


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Well, I could not see the video link in your post above. I was only able to see the link by clicking to quote you.

Anyway, I know this will sound crazy, but you need to check to make sure that your spark plugs are tight. I have seen vids of the same sound and the problem was a loose spark plug.

Hope this helps and let us know.

PS: It still doesn't show up for some reason, so here is the link for others to watch:

__________________
Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold


Last edited by BMR_LVR; 12-24-2012 at 03:13 PM.
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  #12  
Old 12-29-2012, 05:19 AM
ecullen ecullen is offline
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Thanks I will check everything you suggested. And listening to some YouTube videos it sounds very much like the vanos pistons but that's the last thing I will check.

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  #13  
Old 12-29-2012, 05:32 AM
robertobaggio20 robertobaggio20 is offline
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Sounds are particularly difficult to diagnose when you are not in front of the car and able to look see, play with the throttle, etc. You should take your ride to a mechanic. He would have narrowed it down within 5 minutes considering how loud it is. Sometimes its just more efficient to pay the fee and make progress on the resolution. And you run the risk of something snapping each day that you delay and guess at it. Just imagine if it is indeed a cracked pulley like what bmwff (the last best dude to join these forums) suggested. Not worth saving $50 over.

Last edited by robertobaggio20; 12-29-2012 at 05:48 AM.
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