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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 04-26-2015, 03:44 PM
tbsbmw tbsbmw is offline
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Location: Dallas
 
Join Date: Jun 2013
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Mein Auto: 745LI
Knock / Rattle from engine area

I'm trying to help a friend w an odd problem he has with his 7 series. It has an odd knocking sounds that sounds like it is coming from the engine. I say odd because it only occurs in the 2500 - 3500 rpm range , audible when revving the engine in neutral and at highway speed w cruise control on under light load in the same rpm range. It is not present at lower or higher RPMs. If you apply more throttle it goes away. The car will probably go to the shop this week but I'm interested in folks' thoughts about what it could be. Chiefly I'm wondering if an internal engine problem exists but would think you would hear that all the time regardless of RPMs.
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  #2  
Old 04-26-2015, 03:45 PM
tbsbmw tbsbmw is offline
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Mein Auto: 745LI
I should have added that the car runs and drives normally and turning the AC off made no difference, thought it might be an ac compressor/clutch bearing .

Last edited by tbsbmw; 04-26-2015 at 03:45 PM. Reason: fix typo
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  #3  
Old 04-26-2015, 06:44 PM
retz745li retz745li is offline
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I had a similar issue. It turned out to be my alternator. I replaced a bunch of things that could make noise but that was it. Is he getting any error codes or fault codes? Things like transmission fail safe or anything?
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  #4  
Old 04-26-2015, 09:20 PM
tbsbmw tbsbmw is offline
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no error codes at all , nothing unusual about the car other than the noise
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  #5  
Old 04-26-2015, 10:27 PM
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Rookie2008 Rookie2008 is offline
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Location: NYC 4 Eva! Current California
 
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Mein Auto: BMW 328G 750LI/745LI/ F02
Alternator.
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08 750LI W/Rear entertainment
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  #6  
Old 04-28-2015, 07:49 PM
adewest adewest is offline
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Hey I'm getting all sorts of error codes on mine. Mine wouldn't start. RND was blinking and refused to start. Then suddenly it started but steering wheel got really stiff. While making a turn, engine went off and it started. Then the heavy jolts started but the whole dashboard lights up. HELP!!!
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  #7  
Old 04-28-2015, 08:38 PM
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Rookie2008 Rookie2008 is offline
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Location: NYC 4 Eva! Current California
 
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Mein Auto: BMW 328G 750LI/745LI/ F02
Alternator!!!!
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08 750LI W/Rear entertainment
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  #8  
Old 04-28-2015, 09:15 PM
retz745li retz745li is offline
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The alternator can cause this car to do weird things. The electrics are do not respond like regular cars. All of the symptoms point to a voltage consistency issue.
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  #9  
Old 04-30-2015, 07:28 PM
NSG.DS750Li NSG.DS750Li is offline
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Mein Auto: 2007 750Li
Same starting problem.

Quote:
Originally Posted by adewest View Post
Hey I'm getting all sorts of error codes on mine. Mine wouldn't start. RND was blinking and refused to start. Then suddenly it started but steering wheel got really stiff. While making a turn, engine went off and it started. Then the heavy jolts started but the whole dashboard lights up. HELP!!!
I have a 07 750Li, purchased this year with 56k. Problem was apparent within first two weeks of ownership. The car would start intermittently, sometimes not until 10 tries would it turn over. All electrical was functioning correctly and battery brand new. After some research in these postings it is the Integrated Supply Module, I replaced it 1mth ago and no longer get strange tranny fault displays and other messages and it starts every time so far with out hesitation. The part cost about 100 bucks and will take a little time to gain access to the terminal fittings. This is a DIY job, all you need is a allen wrench.
This car has turned into a project of "what is next". I also had the control arm and ball joint replaced, driver side. This happens to be a common fix too. Just took a break from this posting and have more issues to deal with. Now its telling me my car is over heating. It shuts off the AC before notifying of over heating. It's one thing after another.
Keep you posted on the over heating.
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  #10  
Old 05-02-2015, 08:09 AM
lozzmeister lozzmeister is offline
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Mein Auto: e31.e38.e39.e65
noise

ALTERNATOR

the bearings fail and it makes the ezact noise you are talking about .. removing the fan belt will isolate the water pump alternator and idlers from the engine try this first . if the noise goes then try and turn each item by hand
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