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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-20-2016, 09:21 AM
bimmerbob1 bimmerbob1 is offline
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Mein Auto: 2007 328XI
2007 328xi Motor Mounts

Can anyone tell me if there is a way to determine if my motor mounts need to be replaced, will I be able to rock my engine or should I see fluid leaking out of the mounts?

At idle I get a heavy vibration, and sometimes when I step on the gas at low speeds I feel the engine rumble - kind of like it's misfiring but different.
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  #2  
Old 02-22-2016, 08:23 AM
sleeper22 sleeper22 is offline
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How many miles are on the car? Mine were replaced at 73K and feels like a new car now. I would say yours are due for replacement from the description.
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  #3  
Old 02-22-2016, 09:32 AM
fdriller9 fdriller9 is offline
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Sounds like bad mounts if idle is steady but the car is vibrating.

If your mounts are really bad, you can hold the brake and apply light throttle for a couple seconds to see if the engine moves. It should not move more than a few mm. (Don't get crazy with the throttle when brake standing!)

Passenger side mount is a common failure on E9x chassis.
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  #4  
Old 02-22-2016, 11:31 AM
PJP84 PJP84 is offline
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not sure fluid will come out of an engine mount as it is just a metal bracket to the best of my knowledge. as another poster mentioned, check the tachometer. If that is bouncing in conjuction with the rumbling then it could be something else. Most likely a bi-product of a leaky valve cover gasket, eccentric valve sensor, etc. I was just having the problem with idling in drive and a bouncy tach. I'm in the middle of replacing the VCG, eccentric shaft sensor gasket and valvetronic motor gasket. After all that and new spark plugs I'm hoping it will be all better. If tach is moving it could also be an air leak somewhere, O2 sensor, or the like. Best of luck.

http://www.pelicanparts.com/BMW/tech...eplacement.htm

Last edited by PJP84; 02-22-2016 at 11:32 AM. Reason: awkward sentence
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  #5  
Old 02-23-2016, 07:16 AM
bimmerbob1 bimmerbob1 is offline
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The car has 150K on her, I bought her with 95K and not sure if the prior owner had them done in the past. I have had an intermittent vacuum leak that creates a high pitched whistle and the car shudders at idle but that disappears after I shut the engine off for 10 minutes and restart it and I don't think it is related. I'll pay attention to the tach when it happens and I will try putting my foot on the brake and giving it a little rev to see if the engine is jumping. If someone out there has done this job on an 328xi model please confirm the instructions here are spot on http://www.pelicanparts.com/BMW/tech...eplacement.htm
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  #6  
Old 02-23-2016, 07:24 AM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by bimmerbob1 View Post
The car has 150K on her, I bought her with 95K and not sure if the prior owner had them done in the past. I have had an intermittent vacuum leak that creates a high pitched whistle and the car shudders at idle but that disappears after I shut the engine off for 10 minutes and restart it and I don't think it is related. I'll pay attention to the tach when it happens and I will try putting my foot on the brake and giving it a little rev to see if the engine is jumping. If someone out there has done this job on an 328xi model please confirm the instructions here are spot on http://www.pelicanparts.com/BMW/tech...eplacement.htm
The high pitched whistle maybe the diaphragm in your valve cover that is collapsed.

Official fix is a new valve cover at $400+

A company does sell the diaphragm separately but it requires cutting your valve cover open and then re-gluing it back together.
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  #7  
Old 02-23-2016, 09:11 AM
bimmerbob1 bimmerbob1 is offline
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Yikes, that is expensive!
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  #8  
Old 02-23-2016, 02:22 PM
07lilredwagon 07lilredwagon is offline
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valve cover with integral PCV valve = bad design in my opinion....I have had to replace my valve cover due to this..and the fact it was leaking because it had a crack in it....(common, passenger side rear area..which as stated above could account for your oily motor mount...) oil in the motor mount, incidentally, could cause a failure of the rubber parts inside the mount too.....

check for oil seepage just above the the exhaust manifold and shine a flashlight through the intake manifold and look for leaky bits...

JP
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  #9  
Old 02-28-2016, 09:18 AM
bimmerbob1 bimmerbob1 is offline
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I changed out the motor mounts on my 328xi, I followed the Pelican Parts instructions for the most and the only deviation is my model does not have a cross reinforcement brace referenced in figure 5 and I had to remove a heat shield on the left side to be able to remove the mount. The project took me about 4 hours. So far so good on the bouncy engine. I do have a leaky valve cover and will need to tackle that project next.
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  #10  
Old 02-28-2016, 09:21 AM
bimmerbob1 bimmerbob1 is offline
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Location: Annapolis, MD
 
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Quote:
Originally Posted by fdriller9 View Post
The high pitched whistle maybe the diaphragm in your valve cover that is collapsed.

Official fix is a new valve cover at $400+

A company does sell the diaphragm separately but it requires cutting your valve cover open and then re-gluing it back together.
Is there a way to determine if in fact the diaphragm in my valve cover is collapsed? I need to replace the valve cover gasket and if I need a new valve cover than this will be the obvious time to replace it.
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  #11  
Old 02-28-2016, 04:45 PM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by bimmerbob1 View Post
Is there a way to determine if in fact the diaphragm in my valve cover is collapsed? I need to replace the valve cover gasket and if I need a new valve cover than this will be the obvious time to replace it.
http://vanos-bmw.com/membrane-for-co...mw-11127552281
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  #12  
Old 03-01-2016, 08:08 PM
bimmerbob1 bimmerbob1 is offline
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Has anyone done the diaphragm replacement?
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  #13  
Old 03-01-2016, 10:25 PM
PJP84 PJP84 is offline
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Hey glad you got the motor mounts replaced, nice job. If by the diaphragm you mean that little nozzle coming off of that cap that connects to a vacuum line I think only a good epoxy job would do it. Otherwise new valve cover
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