F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 3-Series Sedan / F32 4-Series Coupe Forum > N20 Engine roughness at idle
E92-lighting
Post Reply
 
Thread Tools Search this Thread
      04-28-2012, 09:57 PM   #1
glitched79
Private
 
Drives: 2012 328i
Join Date: Apr 2012
Location: Tampa

Posts: 57
iTrader: (0)

N20 Engine roughness at idle

Title says it all...

How much roughness is normal at idle for this engine?

My last car, a 2008 base MINI Cooper, had almost no vibration at idle with the A/C on, and only a little bit rougher without the A/C.

My new 328i is different. I can definitely tell that the engine is running. I wouldn't say it feels like there's something wrong - there's no warning lights or anything - but the engine definitely let's you know it's running.

Is this normal? Maybe it's the turbos?
glitched79 is offline  
0
Reply With Quote
      04-28-2012, 10:08 PM   #2
bcl0328
Major
 
Drives: 2012 328i
Join Date: Mar 2012
Location: Abingdon, MD

Posts: 1,098
iTrader: (0)

direct injection
bcl0328 is offline  
0
Reply With Quote
      04-28-2012, 10:11 PM   #3
glitched79
Private
 
Drives: 2012 328i
Join Date: Apr 2012
Location: Tampa

Posts: 57
iTrader: (0)

Quote:
Originally Posted by bcl0328
direct injection
But why? You'd think more advanced tech would result in greater smoothness.
glitched79 is offline  
0
Reply With Quote
      04-28-2012, 10:14 PM   #4
mfear
South Florida Elite
 
mfear's Avatar
 
Drives: E93 335i - Crimson Red/Black
Join Date: Apr 2009
Location: Fort Lauderdale, FL

Posts: 257
iTrader: (0)

Send a message via AIM to mfear
tht's just how it is
__________________
[2007 E93 335i 6AT | Crimson Red/Black Dakota | Premium | Sport | Heated Seats | iPod/USB | JB+ | 15% Tint | AngeliBright LED Halos]

mfear is offline   United_States
0
Reply With Quote
      04-28-2012, 10:42 PM   #5
bimmerjph
Lieutenant Colonel
 
bimmerjph's Avatar
 
Drives: 2002 BMW 325i
Join Date: Oct 2011
Location: Tennessee

Posts: 1,926
iTrader: (0)

How does direct injection make it rougher? All that it is doing is changing where the fuel is injected into the engine.
bimmerjph is online now   United_States
0
Reply With Quote
      04-28-2012, 11:03 PM   #6
Elk
Major
 
Drives: 2012 335i
Join Date: Apr 2012
Location: *

Posts: 1,262
iTrader: (0)

Direct injection requires very high pressure in the fuel rails. The ticking sound is the injectors supplying fuel.

It should not idle rough, although the sound is not pretty. If you are concerned, go to the dealer and listen to another similar car to be sure everything is OK.
Elk is offline  
0
Reply With Quote
      04-29-2012, 07:58 AM   #7
TEAShea
Private First Class
 
Drives: 2012 328i
Join Date: Oct 2006
Location: Nebraska

Posts: 179
iTrader: (0)

The engine has balance shafts and should be very smooth at idle. Mine is. However, there is considerable sound from the direct injection system. It makes it sound like a clackity-clack - like a diesel. All direct injection engines have this sound to some extent.
TEAShea is offline  
0
Reply With Quote
      04-29-2012, 07:59 AM   #8
TEAShea
Private First Class
 
Drives: 2012 328i
Join Date: Oct 2006
Location: Nebraska

Posts: 179
iTrader: (0)

Direct injection does not make the engine rougher or vibrate more - just sounds like it.
TEAShea is offline  
0
Reply With Quote
      04-29-2012, 08:14 AM   #9
Q4P
Colonel
 
Q4P's Avatar
 
Drives: Too Much
Join Date: Apr 2011
Location: World

Posts: 2,296
iTrader: (0)

A 4 banger is a 4 banger... it doesn't matter how refined it is... it will still be a little rough at times... DI has little or nothing to do with how smooth the engine will operate. The Mini had a smaller displacement 4 so I could see that making a tiny difference but probably not enough to notice.
__________________
2jZ + RB26 + 4G63 + LS9 + N54 =
Q4P is offline   United_States
0
Reply With Quote
      04-29-2012, 01:34 PM   #10
derekh929
Captain
 
Drives: F31 330d M Sport on Order
Join Date: Apr 2012
Location: Scotland

Posts: 791
iTrader: (0)

Try R56 Cooper S it's like a tractor at idol but i still love it
derekh929 is offline   Scotland
0
Reply With Quote
      04-30-2012, 05:14 AM   #11
SomeRandomer123
Colonel
 
SomeRandomer123's Avatar
 
Drives: F30 328i Luxury - Sport Auto
Join Date: May 2011
Location: Lancashire, North West England, UK

Posts: 2,486
iTrader: (0)

Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
__________________

Gone: 2006 BMW E60 520d SE 6MT
Gone: 2009 BMW E90-LCI 330d SE 6MT
Current: 2012 F30 328i Luxury 8AT
My 328i initial thoughts + media!http://www.f30post.com/forums/showthread.php?t=712673
SomeRandomer123 is offline   England
0
Reply With Quote
      04-30-2012, 07:08 AM   #12
The X Men
Lieutenant Colonel
 
Drives: 2012 535xi 2013 X3 35i
Join Date: Mar 2012
Location: MA

Posts: 1,785
iTrader: (0)

Quote:
Originally Posted by SomeRandomer123 View Post
Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
One word, refinement.
The X Men is offline  
0
Reply With Quote
      04-30-2012, 07:37 AM   #13
cstavaru
Brigadier General
 
cstavaru's Avatar
 
Drives: 2009 335i M Sport Sedan 6MT
Join Date: Aug 2008
Location: Bucharest, Romania

Posts: 3,235
iTrader: (0)

Quote:
Originally Posted by SomeRandomer123 View Post
Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
The 6 cylinder engines are more mechanically "balanced", there are more injection cycles per second so the clicks are more close together. Maybe that's what makes them seem to run smoother. My N54 sure does make all kinds of sounds, including clicks from time to time But it does idle very smooth. The oil used makes a big difference. The factory 5w-30 oil is very good, but - after warranty expires - switch to Motul 300v 5w-30 (twice as expensive and non-BMW approved) and the idle will be even smoother, with less sounds.

Last edited by cstavaru; 04-30-2012 at 07:46 AM.
cstavaru is offline  
0
Reply With Quote
      04-30-2012, 09:49 AM   #14
SomeRandomer123
Colonel
 
SomeRandomer123's Avatar
 
Drives: F30 328i Luxury - Sport Auto
Join Date: May 2011
Location: Lancashire, North West England, UK

Posts: 2,486
iTrader: (0)

Quote:
Originally Posted by The X Men
Quote:
Originally Posted by SomeRandomer123 View Post
Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
One word, refinement.
Hmm, my mum's Kia Cee'd 1.4 direct injection DOHC petrol has a very faint direct injection clackity clack to the point where it's damn near silent when warmed up. Is this because of less pressure than the direct injection system in the N20?
__________________

Gone: 2006 BMW E60 520d SE 6MT
Gone: 2009 BMW E90-LCI 330d SE 6MT
Current: 2012 F30 328i Luxury 8AT
My 328i initial thoughts + media!http://www.f30post.com/forums/showthread.php?t=712673
SomeRandomer123 is offline   England
0
Reply With Quote
      04-30-2012, 02:41 PM   #15
jgrasty
Second Lieutenant
 
jgrasty's Avatar
 
Drives: 2012 BMW 328i
Join Date: Nov 2011
Location: Dallas TX

Posts: 262
iTrader: (0)

Garage List
2012 BMW 328i  [0.00]
The only time I feel vibration from the N20 engine is when it starts.

My instructor at the BMW CCA HPDE this weekend commented that he could not tell when the engine was on, after we put on the helmets. With the helmets off, we could hear the engine, but vibration was almost unnoticeable.

The car performed far better than the driver, BTW, at the HDPE.
jgrasty is offline  
0
Reply With Quote
      04-30-2012, 04:14 PM   #16
glitched79
Private
 
Drives: 2012 328i
Join Date: Apr 2012
Location: Tampa

Posts: 57
iTrader: (0)

As I stated, the vibration isn't outrageous. I guess most people probably wouldn't even notice it. It's just definitely more noticeable than in my MINI.
glitched79 is offline  
0
Reply With Quote
      04-30-2012, 05:02 PM   #17
J Tiberius
Captain
 
J Tiberius's Avatar
 
Drives: Imperial Blue Sport Line
Join Date: Jan 2012
Location: AZ

Posts: 192
iTrader: (0)

I get no more vibration than I did in my e90. It def sounds like a 4 under heavy acceleration, but it is very quiet under normal driving and pretty much zero vibration (at least in mine, anyway).
__________________
2012 F30 328i, Imperial Blue, Sport Line, ZPP, ZPS, ZTP, Sport Auto, Heated Seats, Xenons, H&R Sport Springs, Michelin Pilot Super Sports
J Tiberius is offline   United_States
0
Reply With Quote
      04-03-2013, 08:45 AM   #18
Jax826
New Member
 
Jax826's Avatar
 
Drives: F30 328i
Join Date: Feb 2013
Location: Taiwan

Posts: 7
iTrader: (0)

so did anyone get this fixed?
mine also vibrates when idle and I really don't think this is normal.
My friend has a 320D and there's no noticeable vibration when idles!
Jax826 is offline  
0
Reply With Quote
      04-03-2013, 01:14 PM   #19
rconti
Lieutenant
 
Drives: Z3 M Coupe, NB Miata
Join Date: Apr 2012
Location: SF Bay

Posts: 515
iTrader: (0)

Quote:
Originally Posted by SomeRandomer123 View Post
Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
It does. It just has 2 more of them per crank revolution so you don't notice the distinct clacks as much.
rconti is offline  
0
Reply With Quote
      04-03-2013, 01:26 PM   #20
Yay-Z
Shifting to Top Gear
 
Yay-Z's Avatar
 
Drives: E90 M3/F30 328i
Join Date: Mar 2010
Location: Midland / Houston, TX

Posts: 407
iTrader: (0)

Quote:
Originally Posted by SomeRandomer123 View Post
Isn't the 335i direct injected too? Well, it is, so why doesn't the N55 have a similar clackity clack noise?
My car is direct injected too...
It does. My 335i clacks at idle as well
__________________
2011 E90 M3 DCT
2013 F30 328i SAT
2011 E92 335i 6MT (Gone, will be missed)
Yay-Z is offline   United_States
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 03:07 PM.




f30post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST