Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 01-27-2015, 11:42 PM
df7381 df7381 is offline
Registered User
Location: USA
 
Join Date: Nov 2013
Posts: 2
Mein Auto: 2001 330xi
Misfire Help

Hi all I have a 2001 330xi that has been sometimes giving me a single cylinder misfire when I idle/park. I tried switching plugs/coils and the problem stayed on #2. I finally took it into the shop and a compression test showed #2 was low by 40psi. Compression came up when oil was added to the cylinder.

They then performed a leak down and told me compression was being lost through the piston rings or the crankcase. They said they could hear the leak through the intake/crankcase when pressurized.

The only options he gave me were $4k to pull the engine apart and fix or $3k to swap out with another engine.

Ive been reading up and it seems like the same symptoms may be caused by a stuck piston ring and people suggest seafoam or auto rx. I guess I am looking for any other opinions/experiences and hoping there is another option.
Reply With Quote
Advertisement
  #2  
Old 01-28-2015, 08:16 AM
marcozandrini marcozandrini is offline
Officially Welcomed to the 'Fest
 
Join Date: Feb 2014
Posts: 577
Mein Auto:
How is the car driven? Do you take mainly short trips? How many miles on the car?

Your problem does sounds like a compression ring(s) issue (there are 2 compression rings and a single oil control ring). Are the other cylinders' pressures ok?

I recommend you buy a can of a GM (General Motors) product that's used to free up piston rings. Basically, you remove the spark plug, dump some of this stuff in the plug hole and let it sit overnight. Then rotate the engine by hand (remove the other spark plugs!) and expel the GM product.

There's a great (long) post on Bimmer Forums on how the owner used this product to free up the oil control rings in his M54 engine. It's worth a shot.
Reply With Quote
  #3  
Old 01-28-2015, 09:53 AM
df7381 df7381 is offline
Registered User
Location: USA
 
Join Date: Nov 2013
Posts: 2
Mein Auto: 2001 330xi
Its a mix of quick trips down to the corner store and hour trips every other day. I am at 135k miles now. All other cylinders are fine. I will look up that post and give it a try, thanks.
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)
Today's Posts Search
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 On



Forum Jump


All times are GMT -7. The time now is 04:30 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms