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      09-11-2014, 01:42 PM   #1
chaulet
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New owner of 135i, problem when idling

Hi guys,

I am recently purchased a 135i with 86k miles on it, it's all stock, but I have noticed that when I start the car in the morning, it rattles, it would go away a few minutes later and when I am waiting for the traffic light turns green, it would rattle too. Would it be the carbon buildup problem? Thanks guys!
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      09-18-2014, 11:27 AM   #2
Ekul90
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i think i have a similar problem, got 71k miles and on cold start up there is a fairly loud rattle with an underlying ticking at idle. When the engine has warmed up the rattle almost disappears but the ticking remains. Under acceleration both seem to disappear. Ive had both turbos replaced so its not (or shouldnt be) those, any ideas? dont mean to hijack the thread but wanted to be notified of any replies
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      09-18-2014, 01:00 PM   #3
dans135i
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Hi Guys,
Do a search of the forum. You will find its common and I believe the wastgate is the culprit when cold. I had the same concern when I heard it. Mine is a 2011 135i with 7k miles.

Thanks,
Dan
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      09-18-2014, 01:41 PM   #4
Dackelone
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The N54 and N55 engines make some noise. Mostly it is due to the direct injection system. It's under so high pressure that it kind of makes a diesel rattling sound - when working. This is NORMAL. There have been numerous injector updates over the years. Its best to also make sure your car has the latest ones.


Some early N54 engines had problems with the wastegate actuator rod wearing. Those units has a 8mm rod, while later units had a 10mm rod. ALL 135i's got the later (10mm)design. But still the WG's would rattle under steady throttle conditions. BMW will replace your turbos for this condition.

Of course you could have something simply as a loose heat shield under the car. Also the vacuum hoses(on N54 engines) seem to pop off, the WG actuators.

One easy test is to either remove or "pinch" the two vacuum lines going to these actuators to see IF your WG's are causing the noise.




normally a 30ff code means your turbos are bad though. But its better to check these vacuum hoses first!
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      09-18-2014, 03:01 PM   #5
chaulet
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Thanks guys!!! That really helps, I am just worried since I don't know much about the N54 engine, I only know the carbon buildup is infamous
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