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 11-19-2012, 12:56 PM
Danny Wolfe Danny Wolfe is offline
Registered User
Location: USA
 
Join Date: Feb 2011
Posts: 88
Mein Auto: 2001 740i
Vibration!!!!

Please help with advice: I do not know if this is drive line or engine related....
What are the symptoms of a worn Center support bearing/housing on my 2001 740i. I have a vibration at around 2500 when accererating. I have just replaced the tranny mounts and engine mounts...vibration is better which was more pronounced at 1300-1500. This new vibration is a different one since replacing the motor mounts and tranny mounts. If i need a new drive shaft, is an aftermarket one acceptable with no vibrations? If so, where should i get one. I see them for around 400.00 but i have been told by the dealer tech that they will not balance correctly.
Also: When i jacked the engine up for replacing the engine mounts on the right side, i broke the hose from the secondary air pump. I taped it back together and was wondering if that would cause a rough idle after warm up? I get an occasional rough idle as well.

THANKS SO MUCH FOR YOUR ADVICE AND INPUT!
Reply With Quote
Advertisement
  #2  
Old 11-19-2012, 08:17 PM
joyism5's Avatar
joyism5 joyism5 is offline
Officially Welcomed to the 'Fest
Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Is the vibration coming when the car is in P too? You are stating that it comes at certain RPMs. What about speed? Did you notice the vibration coming at regular speeds? Like, every time when you reach 50 mph. There are other things to check before the driveshaft. If the vibration comes every time when you reach same speed (not rpm) guibo should be checked, rims for oval bending, tires for deformations, front control arms bushings. Rarely the driveshaft is the culprit. You might be one of them, I don't know, but make sure before you spend the money.
The air hose for the air pump could throw a code but not a rough idle. Air is going through this hose only at cold start ups.
__________________
JOY = BMW
Reply With Quote
  #3  
Old 11-19-2012, 09:40 PM
Danny Wolfe Danny Wolfe is offline
Registered User
Location: USA
 
Join Date: Feb 2011
Posts: 88
Mein Auto: 2001 740i
it occurs when i am going about 30-40 mph. and when the car is shifting into third or fourth gear. I feel it in the seat or midway towards the back of the car. The Flex disc looks ok but cannot see the center shaft bearing because its covered with the heat shield. the torque arms trans mounts and engine mounts have all been replaced last week. I didn't feel this vibration before changing the mounts but i had to jack up engine to get them out and back in. Maybe mis aligned the shaft? I didn't take it loose at all, just jacked up the motor and tranny to replace mounts. I had a bit of a vibration before i changed the mounts but that is much better since replacing them. The vib NOW is when i am accelerating from a dead stop, and it seems to get less vib as i continue to accelerate. i do not feel it when in park....maybe JUST a VERY LITTLE but engine is not TOTALLY smooth at idle...sometimes it seems to get a little rough but sometimes its fine. I have NO SES light on. What about center carrier? what about rear axle? what are those symptoms? Or how to check them? Is it true that i have to cut the shaft in order to change the Center Carrier Bearing or can this be done without cutting the shaft? THANKS FOR YOUR HELP!!!!!

Last edited by Danny Wolfe; 11-19-2012 at 09:46 PM.
Reply With Quote
  #4  
Old 11-19-2012, 09:47 PM
Danny Wolfe Danny Wolfe is offline
Registered User
Location: USA
 
Join Date: Feb 2011
Posts: 88
Mein Auto: 2001 740i
car has new michelins, and wheels are fine. This vibration is like a "shudder'. It also isn't as bad at times as other times....i defenitely feel it when i turn or sometimes straight and also when i am climbing a hill. Your thoughts?????

Last edited by Danny Wolfe; 11-19-2012 at 09:49 PM.
Reply With Quote
  #5  
Old 11-19-2012, 11:51 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,368
Mein Auto: E23;E30;E38;E32;E34 +
Center bearing. Seeing how it comes on at specific road speed or high torque situations.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
  #6  
Old 11-20-2012, 08:05 AM
joyism5's Avatar
joyism5 joyism5 is offline
Officially Welcomed to the 'Fest
Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Quote:
Originally Posted by BMWFatherFigure View Post
Center bearing. Seeing how it comes on at specific road speed or high torque situations.
I have same thoughts.
__________________
JOY = BMW
Reply With Quote
Reply

Bookmarks


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 02:20 AM.


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