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 > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

Reply
 
Thread Tools Display Modes
  #1  
Old 08-20-2010, 01:09 AM
HLB HLB is offline
Registered User
Location: Australia
 
Join Date: Feb 2010
Posts: 74
Mein Auto: 1997 740il
MAF sensor housing crack

Hi,

The PO had an issue with the fan and it basically fell apart. A small section of blade lodged into the MAF housing causing a small crack and air to obviously leak through. Luckily that was the only damage.

Does anyone know what effect a tiny leak like this would have on the bottom of the MAF?

Does anyone also know what volumes or speeds air can potentially pass throught the MAF?

Interesting discussion.

Thanks
Reply With Quote
Advertisement
  #2  
Old 08-20-2010, 01:10 AM
HLB HLB is offline
Registered User
Location: Australia
 
Join Date: Feb 2010
Posts: 74
Mein Auto: 1997 740il
Just to clarify, does anyone know what effect this would have on performance?

Wording in previous post was ambiguous.

Thanks
Reply With Quote
  #3  
Old 08-20-2010, 03:14 AM
CodyItaliano's Avatar
CodyItaliano CodyItaliano is offline
Officially Welcomed to the 'Fest
Location: Corpus Christi, TX
 
Join Date: Feb 2009
Posts: 628
Mein Auto: 2001 740i
do you mean the cylinder section that the intake tubing attaches to? if the sensor itself is still good and the housing you say just has a crack, JB weld is your friend, or a plastic compatible epoxy. you can buy a new one on oembimmerparts.com for about $200 shipped though. but yes, any air leakage around the sensor will cause problems.
__________________

*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*
Reply With Quote
  #4  
Old 08-20-2010, 04:16 AM
HLB HLB is offline
Registered User
Location: Australia
 
Join Date: Feb 2010
Posts: 74
Mein Auto: 1997 740il
Yeah its the cylinder section where the MAF is screwed in with two screws. Its fixable without buying a new one. The sensor itself is fine.

I was just wondering with a perfect sensor and the small leak what effect this would have on performance.
Reply With Quote
  #5  
Old 08-20-2010, 05:05 AM
CodyItaliano's Avatar
CodyItaliano CodyItaliano is offline
Officially Welcomed to the 'Fest
Location: Corpus Christi, TX
 
Join Date: Feb 2009
Posts: 628
Mein Auto: 2001 740i
any air leak around the sensor is bad. try and seal it
__________________

*Der E38*
manufactured: 7/01
color: anthrecite metallic
wheels: style 89 E66, 19X9F 19X10R
ext. lighting: 8000k D2S & LED plate light
*want to get sport rear diff*
Reply With Quote
  #6  
Old 08-20-2010, 07:58 AM
balance balance is offline
Officially Welcomed to the 'Fest
Location: NC
 
Join Date: Feb 2009
Posts: 766
Mein Auto: 97 740iL
I agree with CodyItaliano, and if it was my car, I'd probably JB weld it myself.

What the MAF does is meter the air coming into the engine, and adjust fuel to match it to make the best air/fuel ratio for a certain RPM. If unmetered air enters the motor, then the air/fuel ratio will be off, causing hesitation, rough idle, misfiring, and if it is bad enough, will cause the engine to shut off while it is running.
Reply With Quote
Reply

Bookmarks

Tags
air, e38, maf


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)
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 Off



Forum Jump


All times are GMT -7. The time now is 09:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms