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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 01-19-2013, 11:35 AM
oliviasz oliviasz is offline
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Location: blue springs, mo
 
Join Date: Jan 2013
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Mein Auto: z4
rattling sound under cylinder cover

Having a noise on 2003 z4 causing me concern. Rattling sound under cylinder head cover when accelerate or rev engine. Have removed cover but do not know what i am looking for. Does not seem to affect performance.anything a novice can look for or is it more serious?
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  #2  
Old 01-21-2013, 01:21 AM
Droptop85 Droptop85 is offline
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Location: Fresno
 
Join Date: Oct 2011
Posts: 351
Mein Auto: 03 Z4 3.0i
Might be your vanos system. May be time for a rebuild
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  #3  
Old 01-21-2013, 12:54 PM
Uber-Fritz Uber-Fritz is offline
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Location: Victoria BC
 
Join Date: Aug 2012
Posts: 21
Mein Auto: 2006 Z4 3.0i
Are you positive that is where the noise is coming from? Can you reproduce it your garage? A "rattle" sounds awfully terminal if it is truly coming from your valve train, but it could just as easily be something loose in the immediate vicinity.
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Old 01-22-2013, 08:30 AM
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imz4n imz4n is offline
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Location: OC, CA.
 
Join Date: Oct 2005
Posts: 692
Mein Auto: 06 3.0 si Z4R
Could be the DISA valve. Do a search and see if the rattle match what you have going on. The DISA and be unplugged to eliminate as a problem. This is on a e46 however the same applies to the Z4.
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Old 01-23-2013, 06:59 AM
oembimmerparts oembimmerparts is offline
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Location: San Antonio
 
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Mein Auto: 2001 Z3
The freezing weather this winter is taking out DISA valves all over, We have been selling them as fast as we can get them in. Im betting disa aswell.

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