E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 05-13-2015, 01:07 AM   #1
Skydaver
Registered User
 
Join Date: Nov 2014
Location: Jersey City
Posts: 7
My Ride: 2004 300xi
2004 330xi - What else to do while doing valve cover gasket replacement?

Hi,

My 2004 300xi has about 160K miles, and has developed a small oil leak, so it's time to replace the valve cover gaskets.

While I'm in there, I'm considering doing some other things as well. Should I do any of the following...

1. Replace the spark plugs. This was done at 100K and the old ones looked shiny and new. However, since *everything* else will be removed and it'll take about three minutes to replace them, should I do it? Seems like an easy "yes"

2. Replace the O2 sensors. This wasn't done at 120K as specified in the maintenance manual. Looks like the two pre-cat sensors will be easier with the valve cover off. However, I'm not getting any error codes.

3. Replace coils and/or ignition wires?

4. Something else?

Your thoughts and suggestions are greatly appreciated and welcomed
Skydaver is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 05-13-2015, 08:05 AM   #2
markusmarkus
Registered User
 
Join Date: Jul 2008
Location: USA
Posts: 2,062
My Ride: 2001 330Ci
I'd definitely change the pre-cat (only) O2 sensors if they're the originals. It can be a pita as sensors may not have received enough copper-bases anti-seize compound at the factory. So, if you change them put copious amounts of copper-based anti-seize compound on the sensors' threads.

Make sure you change all 15 rubber grommets on the VC. Otherwise you may have vacuum leaks.

You'll have to remove the hose that runs down to the crankcase ventilation system (cvs) located under the intake. If the cvs hasn't been changed I can guarantee you that the hose and/or its connector will crumble when you try to remove it from the valve cover.

Nothing in a BMW is a matter of simply replacing a part!
markusmarkus is offline   Reply With Quote
Old 05-13-2015, 07:04 PM   #3
Kye7
Registered User
 
Join Date: Aug 2014
Location: El Paso
Posts: 116
My Ride: BMW 2003 330xi
DO THE VANOS!!
It will take ~4 hours. ~3 with the VCG already off
It will only cost you $60


Rebuild your vanos. There are small o-rings inside the unit that become worn over time, and decrease gas mileage, overall power, and result in loss of low end torque.
Read about it here.
http://www.bmw.com/com/en/insights/t...ble_vanos.html
http://www.beisansystems.com/procedu..._procedure.htm
Kye7 is online now   Reply With Quote
Old 05-13-2015, 10:37 PM   #4
Skydaver
Registered User
 
Join Date: Nov 2014
Location: Jersey City
Posts: 7
My Ride: 2004 300xi
Quote:
Originally Posted by markusmarkus View Post
I'd definitely change the pre-cat (only) O2 sensors if they're the originals.
Why not the post-cat O2 sensors, too?

Thanks for the reply!
Skydaver is offline   Reply With Quote
Old 05-13-2015, 10:54 PM   #5
Skydaver
Registered User
 
Join Date: Nov 2014
Location: Jersey City
Posts: 7
My Ride: 2004 300xi
Quote:
Originally Posted by Kye7 View Post
DO THE VANOS!!
I've read about VANOS before, and thought about it... BUT... no problem with mine. Seems like a lot of work (3 hours? Ha! will take me all day) for a problem that doesn't seem to exist. (Or is right around the corner...)

Thanks for the reply!
Skydaver is offline   Reply With Quote
Old 05-13-2015, 11:58 PM   #6
Kye7
Registered User
 
Join Date: Aug 2014
Location: El Paso
Posts: 116
My Ride: BMW 2003 330xi
You can't tell it's bad because they wear out so slowly by 100k miles..
I had it on mine, and I definitely felt the difference and it fixed my rough idle too
Kye7 is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 On
Censor is ON





All times are GMT -5. The time now is 10:29 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use