BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


Reply
 
Thread Tools Display Modes
Old Wed, Dec-05-2018, 03:22:17 PM   #21
zaharias
Registered User
 
Join Date: Jun 2015
Posts: 215
Reputation: 0 zaharias is on a distinguished road
Location: Chios/Greece

Greece




Default Re: knocking noise after cold start

Could this be a faulty Vanos pressure accumulator?
Jump to top zaharias is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Wed, Dec-05-2018, 06:14:44 PM   #22
Cmamainer
Registered User
 
Join Date: Jul 2013
Posts: 46
In the garage:
Reputation: 0 Cmamainer is on a distinguished road
Location: Portland

United States




Default Re: knocking noise after cold start

Quote:
Originally Posted by zaharias View Post
Could this be a faulty Vanos pressure accumulator?
I changed this and in my case it made no difference.
Jump to top Cmamainer is offline   Reply With Quote
Old Thu, Dec-06-2018, 12:22:05 PM   #23
mpwr92
Registered User
 
Join Date: Sep 2013
Posts: 65
Reputation: 0 mpwr92 is on a distinguished road

United States




Default Re: knocking noise after cold start

Problem in the actual Vanos unit I rebuilt mine twice changed accumulator change solenoid
Changed internal pressure valve still resulting in 800psi of pressure no fault code just poor downlow mid performance and extremely rattley only on cold start brand new Vanos solved it must be worn bores or blockige check your Vanos pressures first.
Jump to top mpwr92 is offline   Reply With Quote
Old Sun, Dec-09-2018, 01:09:52 PM   #24
Andy2424
Registered User
 
Join Date: Oct 2018
Posts: 7
In the garage:
Reputation: 0 Andy2424 is on a distinguished road

Germany




Default Re: knocking noise after cold start

Please check the exhaust pump

Sorry my englisch is bad
Attached Images
File Type: jpg Abgaspumpe.JPG (21.4 KB, 15 views)
Jump to top Andy2424 is offline   Reply With Quote
Old Sun, Dec-09-2018, 01:44:58 PM   #25
TropicalM3
Registered User
 
Join Date: Sep 2009
Posts: 170
In the garage:
Reputation: 0 TropicalM3 is on a distinguished road
Location: Ocho Rios

Jamaica




Default Re: knocking noise after cold start

Do you think a stretched timing chain could cause this? Reason y I asked, when i did my hub change and was catching the timing, for the life of me I couldn't the timing marks lined up 100%(when 1 side is lined up the other side was out a bit) and I figured maybe my chain was stretched. So on cold start up it would take more time for the timing chain tensioner to build the right pressure to take up the extra slack. What you guys think? Makes sense?
Jump to top TropicalM3 is offline   Reply With Quote
Old Sun, Dec-09-2018, 02:14:50 PM   #26
zaharias
Registered User
 
Join Date: Jun 2015
Posts: 215
Reputation: 0 zaharias is on a distinguished road
Location: Chios/Greece

Greece




Default Re: knocking noise after cold start

Quote:
Originally Posted by Andy2424 View Post
Please check the exhaust pump

Sorry my englisch is bad
Don't think it's related to this.


Quote:
Originally Posted by TropicalM3 View Post
Do you think a stretched timing chain could cause this? Reason y I asked, when i did my hub change and was catching the timing, for the life of me I couldn't the timing marks lined up 100%(when 1 side is lined up the other side was out a bit) and I figured maybe my chain was stretched. So on cold start up it would take more time for the timing chain tensioner to build the right pressure to take up the extra slack. What you guys think? Makes sense?
I changed the chain tensioner in June (no difference) and did a full Beisan Vanos refresh 1.5 year back. Ive done around 15K kms since the vanos repair. That cold start sound started a year after the vanos repair and around 10K kms.
Jump to top zaharias is offline   Reply With Quote
Old Sun, Dec-09-2018, 07:45:04 PM   #27
Arehman
Registered User
 
Arehman's Avatar
 
Join Date: Nov 2004
Posts: 1,666
In the garage:
Reputation: 0 Arehman is on a distinguished road
Location: Stone Mtn, GA

Pakistan




Default Re: knocking noise after cold start

My issue ended up being the rod bearings. Changed those noise gone. A couple were down to the copper. My noise was consistent though, you could hear it at low rpms. caught it just in time before they spun.
__________________


2002 AW/IR 6spd coupe
Jump to top Arehman is offline   Reply With Quote
Old Wed, Dec-12-2018, 12:51:18 AM   #28
E46Hoonigan
Registered User
 
E46Hoonigan's Avatar
 
Join Date: May 2016
Posts: 153
In the garage:
Reputation: 0 E46Hoonigan is on a distinguished road
Location: Atlanta

India




Default Re: knocking noise after cold start

Mine still makes this noise only on really cold mornings and my rod bearings have about 7k miles on them. I think its just take a second for oil pressure to build when its cold.



Edit: Looks like I already replied to this thread a while ago lol.
__________________
Instagram: sid_e46

CarbonBlack/Cinnamon E46 M3
Koni/Vogtland, Apex ARC-8 18" Square/PS4s, Powerflex, Megan Racing Sec. 3, WPC Rod Bearings, CSL Diffuser, ECS OCC, Besian VANOS, Mishimoto Electric Fan, 3.91 Gears

Alpine White/Sakhir Orange F10 M5 Comp
Stage 1 Vargas Turbo Upgrade
Jump to top E46Hoonigan is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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. The time now is 08:54:37 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing knocking noise after cold start in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)