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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 06-06-2014, 04:25 PM
matthewnadeau matthewnadeau is offline
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Location: Roseville, CA
 
Join Date: Jun 2014
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Mein Auto: 2001 525i
Unexplained Smoke

I have a 2001 BMW 525i with about 90K miles which has been maintained very well.

Recently, when we start the car up, there is a "puff" of smoke that comes out from under the hood and then goes away after ~ 1 minute. Other than that, the car runs well, there's no warning light, and there's no smoke if we start up the car 2 or 3 hours later.

I have an appointment to bring it in to our shop next week, but I wanted to see if there was anything I can check before then.

The recent maintenance that's been performed within the last 2 months:
1. Water pump seized and the fan belt shredded (possible that there are fragments somewhere?)
2. Radiator hose replaced (damaged from fan belt explosion)
3. Oil change

This work was done on 4/14 and the smoke first appeared earlier this week (5 or 6 weeks later).
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  #2  
Old 06-06-2014, 04:39 PM
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helmet75 helmet75 is offline
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Location: KC
 
Join Date: Mar 2014
Posts: 1,168
Mein Auto: 2000 528i 9/99
sounds like you are getting oil in to the intake through the CCV and its seeping in to the cylinder on start up.
has that been replaced?
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Looking for Parts for my E39- PM Me for wishlist and to deal!
2000 528i- Current Daily Driver and Project Car
2004 Pontiac Grand Prix GTP Comp G- 3.8 Supercharged. Sold to buy the BMW. Chipped, 27MPG, tons of torque.
2005 Pontiac Grand Prix GT- Traded in to get GTP. Electrical Hell.
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  #3  
Old 06-07-2014, 02:52 PM
matthewnadeau matthewnadeau is offline
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Location: Roseville, CA
 
Join Date: Jun 2014
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Mein Auto: 2001 525i
Is there an easy way to check to see if it's the CCV?

I started it up this morning after it sat for about 12 hours and there was no smoke, no smell, and no indications of any problem.
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  #4  
Old 06-07-2014, 03:08 PM
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helmet75 helmet75 is offline
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Location: KC
 
Join Date: Mar 2014
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Mein Auto: 2000 528i 9/99
I just re-read your original post.
you say the smoke is coming from under the hood?
if so, next cold start, have someone start it while you are under the hood.
you either have a leaking valve cover gasket or oil leaking from the CCV
we can't really help until we know for sure.
__________________

Looking for Parts for my E39- PM Me for wishlist and to deal!
2000 528i- Current Daily Driver and Project Car
2004 Pontiac Grand Prix GTP Comp G- 3.8 Supercharged. Sold to buy the BMW. Chipped, 27MPG, tons of torque.
2005 Pontiac Grand Prix GT- Traded in to get GTP. Electrical Hell.
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