E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Help Diagnosing N55 Sounds



Reply
 
Thread Tools Search this Thread
      01-12-2020, 12:43 PM   #1
darkrom
Colonel
darkrom's Avatar
United_States
187
Rep
2,206
Posts

Drives: 135i
Join Date: Feb 2011
Location: North Shore MA

iTrader: (5)

Help Diagnosing N55 Sounds

It just started today. Stock car no mods besides chargepipe.




Going to take it to the dealer but in the meantime wondering what it could be.
Appreciate 0
      01-12-2020, 04:46 PM   #2
The Blimp
Private
17
Rep
87
Posts

Drives: A Car
Join Date: Mar 2018
Location: Sydney

iTrader: (0)

Could be the boost solenoid giving up. I have had strange noises from a boost solenoid before and it had a similar tone, although it wasnt a constant drone like that.
Appreciate 0
      01-13-2020, 12:48 PM   #3
rich_mane
First Lieutenant
rich_mane's Avatar
139
Rep
227
Posts

Drives: 2011 E92 335i
Join Date: Jan 2016
Location: S.FL

iTrader: (1)

Strange noise. Could be a lot of different things. Could be the water pump, mine made a lot of noise when it was on its way out. I'd pull the oil cap while it's running just to rule out excessive vacuum from a failed PCV. Or could just be a pulley failing and making some noise.
Appreciate 0
      01-14-2020, 07:38 AM   #4
e36addict
Captain
United_States
137
Rep
952
Posts

Drives: 2013 X1 35iX
Join Date: Jul 2013
Location: Tim @ BMW of Dallas

iTrader: (5)

The clicking noise in the beginning is the belt tensioner. The strange humming noise sounds like it could be the wastegate pressure converter. I'd unplug it and see if it goes away.
__________________
13 X1 35iX, 98 Z3 2.8, 01 M Coupe, 96 Z3 1.9 DASC, 95 318ti, 13 smart fortwo
Appreciate 0
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



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




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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