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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Strange N55 noise at Idle.



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      09-22-2011, 10:59 AM   #1
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Strange N55 noise at Idle.

Crossposting this from 1addicts since E90 post has a dedicated N55 subforum:

Hey guys, my N55 is making a weird noise at idle but it comes and goes, almost like it's something the engine is doing since it comes and goes on a pattern. The problem is it sounds like an awful knocking noise.

It's got 16k miles and it isn't throwing any codes, tailpipes do look a little whitish though (I've heard this is common from N55's)

Here is a video I took of the idle, sorry you can't see anything, it was dark outside. You can hear the noise at the beginning, then it stop, comes back, stops and comes back again.

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      09-22-2011, 11:01 AM   #2
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that does not sound good!!! i would say remove your mods and take it to the dealer
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      09-22-2011, 12:39 PM   #3
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Yeah that sound is unusual. Definitely get it checked out!
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      09-22-2011, 03:30 PM   #4
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Changed the oil & filter, no shavings or anything in it, car hasn't made the noise today but I'll keep an eye on it. No one elses car does that?
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      09-22-2011, 06:31 PM   #5
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Money shift?
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      09-22-2011, 07:39 PM   #6
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MINE MAKES THE SAME NOISE!! I thought it was only me


What kind of mods do you have in your car? I took mine to the dealer (with my downpipe still in) and my tech said nothing seemed wrong
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      09-22-2011, 07:42 PM   #7
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Quote:
Originally Posted by jeff2.0t View Post
Money shift?

Nah no money shift. This is 1Addicts not the E36 M3 forum.

I did a track day yesterday and the oil was kind of old (16k miles, car just finally gave me the orange service light [under 1500 miles til due]) so I had it changed today.
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      09-22-2011, 07:45 PM   #8
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Quote:
Originally Posted by nkadisha View Post
MINE MAKES THE SAME NOISE!! I thought it was only me


What kind of mods do you have in your car? I took mine to the dealer (with my downpipe still in) and my tech said nothing seemed wrong

Similar stuff to you, AR dp, JB3 stg 2, axleback. My tech watched the video and said it could have been the lifters, it's not doing it today.
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      09-22-2011, 08:12 PM   #9
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Well let me know if you ever find out what it is, I've just come to accept it


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      09-24-2011, 06:18 AM   #10
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sounds fruity dicker
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      09-24-2011, 09:46 AM   #11
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Mine sounds the same... err that is my 6.7l cummins diesel at least does.

Take that thing in.

P.S. I will say though that my old cx-7 direct injected turbo motor did start getting quite loud like this and almost diesel sounding after about 100k km's. Dealer said it was fine and normal.
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      09-25-2011, 10:34 PM   #12
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my N55 also sounds the same, complained but said it was normal for BMW turbo engine. Subscribe this thread for the solution.
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      09-25-2011, 10:36 PM   #13
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hmm doesnt sound too good.

is your car due for the DME update?
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      09-25-2011, 10:36 PM   #14
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Prolly cause the engine is minus one turbo..
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      10-09-2011, 10:07 PM   #15
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mine just started doing this at 15k miles :/
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      10-09-2011, 11:06 PM   #16
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its a normal sound made by the injector. don't worry too much!
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      10-10-2011, 01:36 AM   #17
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Quote:
Originally Posted by ian2002525 View Post
its a normal sound made by the injector. don't worry too much!
it's making that sound everyday for me.
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      01-26-2012, 06:46 AM   #18
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Quote:
Originally Posted by ian2002525 View Post
its a normal sound made by the injector. don't worry too much!
" THE INJECTOR " please elaborate.
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      01-26-2012, 08:17 AM   #19
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I think mine does this sometimes....?
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      01-26-2012, 12:51 PM   #20
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I believe that sound is normal. Mine does that too, it's feint and it comes and goes... it's never LOUD... very feint tick/knock. If you'd like to scare the shit outta yourself, pull the oil cap off while it's doing it... sounds like there is a bolt rattling around INSIDE the engine.

Mine has ~7k on it. I compared it to three other N55 cars at the dealership with similar miles and they ALL made the same crazy "something's broken" inside sound when you pull the oil cap while it's idling. I believe it's just the vanos/valvetronic motors doing their jobs. Just happens to be noisier on the N55. Mine has made it since day one, I can really only hear it in the garage when it's quiet. I'm not worried as the car has great power and went 13.4 bone stock.

P.S., if you pull the oil cap off while running, only do it for a BRIEF time (a second or two). Leaving it off while running will cause an SES light for lean air mixtures.
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      01-26-2012, 11:24 PM   #21
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My car made a similar noise but it got louder as i drove. Dealer said one of my hoses in the way front was rubbing against my pulley. They replaced the hose and moved it forward and it doesn't make that noise again.
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      01-27-2012, 03:32 AM   #22
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mine does too...i thought its normal... so far 2800 miles... same sounds

wrong~!???
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