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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 04-08-2011, 06:29 PM
dreamerx5 dreamerx5 is offline
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Rattling Noise coming from the Wastegate Actuator

I just got my car back from the dealership after numerous attempts to determine what was causing the rattling noise from the engine. Apparently all X5's that have the new twin power turbo's have the rattling noise come from the wastegate actuator. Anyone getting a rattling noise when they start there car or as they are accelerating?
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  #2  
Old 04-08-2011, 06:45 PM
zz6938 zz6938 is offline
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Quote:
Originally Posted by dreamerx5 View Post
I just got my car back from the dealership after numerous attempts to determine what was causing the rattling noise from the engine. Apparently all X5's that have the new twin power turbo's have the rattling noise come from the wastegate actuator. Anyone getting a rattling noise when they start there car or as they are accelerating?
35D or 35I
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  #3  
Old 04-08-2011, 08:41 PM
rattmann rattmann is offline
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yes
but goes away in exactly 45sec
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  #4  
Old 04-09-2011, 12:14 AM
ANZAC_1915 ANZAC_1915 is offline
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Quote:
Originally Posted by dreamerx5 View Post
I just got my car back from the dealership after numerous attempts to determine what was causing the rattling noise from the engine. Apparently all X5's that have the new twin power turbo's have the rattling noise come from the wastegate actuator. Anyone getting a rattling noise when they start there car or as they are accelerating?
How do you know it is coming from the WGA?

More likely this is pinging/detonation. What octane gas are you using?

btw the "twin power" turbo on the N55 is a single, twin-scroll turbo.
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  #5  
Old 04-09-2011, 06:08 PM
dreamerx5 dreamerx5 is offline
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I have a 2011 x5 35i. This is the twin powered turbo n55 engine. After about 500 miles into the car, I noticed a rattling noise coming from the engine. I can only hear it when my windows are down. It would happen during the under load. After going back and forth with the dealership about 6 times, they finally determined that the rattling noise coming from the engine is coming from the wastegate actuator. They told me that this was normal and showed me another 2011 x5 (with 5 miles The car) making the Same sound. I test drove three new 2011 x5's to see if it makes the same sound and none of them did.

I'm going to give it one last try and test drive one more x5.
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Old 04-09-2011, 08:47 PM
ard ard is offline
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So a faint rattling only when you are at low speed, windows down, in a structure that reflects the sound?

In most turbos I've set up there is usually enough preload on the actuator that they dont rattle (or I cannot hear it!)

I wonder if we might find a BMW procedure on setting the actuators.....

Last edited by ard; 04-09-2011 at 08:52 PM.
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  #7  
Old 04-10-2011, 08:11 AM
rattmann rattmann is offline
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does it has any thing to do with the vacuum actuator that controls a gate on the passenger side exhaust pipe?
I have wired it to be fully open all the time and LOVE the Turbo BOOST loud sound!
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  #8  
Old 04-10-2011, 10:50 AM
Cincinnati Kid Cincinnati Kid is offline
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Has this wastegate rattling issue also been reported/experienced with the 50 V8?
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  #9  
Old 04-10-2011, 01:20 PM
dreamerx5 dreamerx5 is offline
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Quote:
Originally Posted by ard View Post
So a faint rattling only when you are at low speed, windows down, in a structure that reflects the sound?

In most turbos I've set up there is usually enough preload on the actuator that they dont rattle (or I cannot hear it!)

I wonder if we might find a BMW procedure on setting the actuators.....
Ard,

Thats correct. You can hear it best when you're in a enclosed area during the under load. Also it's not so faint if you have the windows down. I'm thinking that I'm the only one that has this problem or no one else is bothered by this.

I will try to put it up on you tube when I can get a chance.
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  #10  
Old 04-10-2011, 08:53 PM
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i think I have this but just am not bothered by it.
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  #11  
Old 04-11-2011, 08:22 AM
dreamerx5 dreamerx5 is offline
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Originally Posted by the kidd View Post
i think I have this but just am not bothered by it.
Really????How could you not be bothered by this? Did you buy or lease the car?
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  #12  
Old 04-13-2011, 12:00 AM
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Really????How could you not be bothered by this? Did you buy or lease the car?
I bought the car and never really identified it as a "problem". It so far has not affected the performance of the car.
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  #13  
Old 04-13-2011, 08:21 AM
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David1 David1 is offline
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They all do it or will do it. All of my BMW turbos have this noise especially upon startup in the garage.
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  #14  
Old 04-14-2011, 08:20 AM
dreamerx5 dreamerx5 is offline
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I had a 2008 535i and it never made that noise.
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  #15  
Old 04-14-2011, 12:29 PM
ANZAC_1915 ANZAC_1915 is offline
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Quote:
Originally Posted by dreamerx5 View Post
I had a 2008 535i and it never made that noise.
Different engines. N54 in 535i has twin turbos. N55 in X5 35i has one twin-scroll turbo.

I doubt it is the WGAs rattling. One one side of the rod is a diaphragm, and the other connects to the wastegate arm via a clevis or something, fit is usually pretty precise.

Also, if it was the WGA, you think it would do it on overrun/decel too. Doing it under load sounds more like detonation, which is far more concerning.
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  #16  
Old 04-14-2011, 11:31 PM
Bimmerx53 Bimmerx53 is online now
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When I got my x5 35d, I had a buzzing/rattling sound but it went away once I reached 1000 miles. The dealer said "That is normal, our cars are not quiet like Lexus'."
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  #17  
Old 04-15-2011, 06:02 AM
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Quote:
Originally Posted by ANZAC_1915 View Post
Different engines. N54 in 535i has twin turbos. N55 in X5 35i has one twin-scroll turbo.

I doubt it is the WGAs rattling. One one side of the rod is a diaphragm, and the other connects to the wastegate arm via a clevis or something, fit is usually pretty precise.

Also, if it was the WGA, you think it would do it on overrun/decel too. Doing it under load sounds more like detonation, which is far more concerning.
The wastegate arm actuator set ups are the same between the N54/N55. How the actuator is controlled is a little different. The rod rattles when it is at rest or light load. They are loose fit. When the motor is cold, you rattle it by hand vertically and horizontally even if if you pre load it with vacume pump. At speed, you will not hear it on decel and you can not hear detonation on any modern automobile and if you did you would have a CEL. The preload can be set by the dealer, but requires removal of the turbo and placed in acalibration jig that takes into account many variables including atmospheric pressure. I have the small wrenches to adjust the arm and usually it only takes about a 1 turn of the rod to get rid of most of the rattle but thew dealers are not allowed to adjust it. Most people never hear it, but some people do.
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  #18  
Old 04-15-2011, 06:08 AM
ard ard is offline
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Quote:
Originally Posted by David1 View Post
you can not hear detonation on any modern automobile and if you did you would have a CEL. .

Indeed. THis is a carry over from the old days.

Today with Knock Sensors, the DME will hear it well before you do, and tweak timing advance so it goes away...if the knock sensor fails the DME knows this and automatically pulls timing to prevent damage.

I suspect there simply is NO situation where a modern, computer controlled motor with knock sensors could audibly knock. with or without CEL.

A
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  #19  
Old 04-15-2011, 06:21 AM
diesaroo diesaroo is offline
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I wouldn't say that as an absolute, but usually the computer will be able to adjust for it.

My 2000 Subaru Outback has always pinged under light/no load conditions, it has a knock sensor and no CELs are displayed. It calls for 87 octane, but I run 89 and it seems to help, but doesn't go away completely. I think a very light ping doesn't hurt the engine too much...it's got 137k on it now, and apart from the piston slap when cold (hypereutectic pistons), it runs like a champ.

But it can be concerning...yet another reason to drive an auto-ignition engined vehicle...

Edit: Compression Ignition engined vehicle...Oil burner ya know...
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Last edited by diesaroo; 04-15-2011 at 06:40 AM.
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  #20  
Old 04-15-2011, 11:50 AM
ANZAC_1915 ANZAC_1915 is offline
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Quote:
Originally Posted by ard View Post
Indeed. THis is a carry over from the old days.

Today with Knock Sensors, the DME will hear it well before you do, and tweak timing advance so it goes away...if the knock sensor fails the DME knows this and automatically pulls timing to prevent damage.

I suspect there simply is NO situation where a modern, computer controlled motor with knock sensors could audibly knock. with or without CEL.

A
Not true. Modern engines will retard timing and decrease boost, but it doesn't always prevent it, the software can only so so much. I have heard detonation on modern road, race and rally cars. And yes you can hear it clearly under load.

I am not saying it is the issue but a possibility given it is reported under load.
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  #21  
Old 04-16-2011, 09:22 AM
dreamerx5 dreamerx5 is offline
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All I can say is that I hate the sound of it.
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  #22  
Old 04-21-2011, 12:53 PM
dreamerx5 dreamerx5 is offline
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Does anyone have this problem?
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  #23  
Old 04-21-2011, 01:36 PM
ard ard is offline
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Originally Posted by dreamerx5 View Post
Does anyone have this problem?
What problem?
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  #24  
Old 05-13-2011, 11:20 AM
dreamerx5 dreamerx5 is offline
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Rattling noise? OPEN YOUR WiNDOWS AND LISTEN TO THE RATTLE DURING THE UNDERLOAD AND AS SOON As YOU START YOUR CAR. DOES IT DRIVE YOU CRAZY OR IS IT JUST ME?

Last edited by dreamerx5; 05-13-2011 at 11:25 AM.
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  #25  
Old 05-13-2011, 12:25 PM
ard ard is offline
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Just you.

If it is so annoying, why not just adjust the wastegate preload?

Instead of coming back every few weeks and bumping this thread?\...
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