Thump and pull when coasting. - BMW Forum - BimmerWerkz.com
BMW Forum BMW Forum

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper
Register Home Forum Active Topics Gallery / Showroom Auto Loans Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

BimmerWerkz.com is the premier BMW Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-09-2009, 08:40 PM   #1 (permalink)
n00b
 
Join Date: Jul 2009
Car:
Posts: 2
Photos:
jftoha is on a distinguished road
Thump and pull when coasting.

Hi everyone,

I hope you can help me with an issue with my 2004 645ci. A couple of days ago I noticed that when going at 30 mph and barely putting any pressure on the gas, sort of coasting, there is a slight thump noise with a slight pull. It feels like a very small stall in the engine that last a second and affects the pull of the car. It's almost imperceptible, but if you pay attention it clearly is there. My wife heard when I asked her to pay attention, so that means it's real but if I did not tell her about it she probably would not have noticed. The noise seems to come from the rear of the car though and not the front. It comes at regular intervals about 5 seconds apart and if a step on the gas even a little, it goes away. I have an automatic transmission with the sport package and the car has 51,000 miles.

Any ideas?

Thanks
jftoha is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-16-2009, 04:31 PM   #2 (permalink)
5th Gear Member
 
darkhorse737's Avatar
 
Join Date: May 2008
Location: San Francisco, CA
Car: 88 super ETA, 95 525i
Posts: 1,494
Photos:
darkhorse737 is on a distinguished road
Lightbulb

there's a number of parts that come into play in the rear.

thump with slight pull - let's start with easy things frst. check tires/rims for imperfection. you might try to jack the rear end, shift in drive to check for "wobble"

if none:
- the center support bearing, guibo or u-joint on the propeller shaft.
-check oil in the differential too. pay close attention to the sediment. metal in the oil? the 5-second interval u say could be associated with a chipped gear.... but i hope not ,considering u only have 50,xxxmiles.
*if u hvnt done service... it might be a good time to inspect and maybe change differential oil.

*other thump, thump, thump possibles. loose/bad bearings, uneven brake pads or warped rotors.

Good luck
darkhorse737 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
635 csi issue whith clunk/thump rear end AlpineSixAndSeven 1,6,7,8 - Series and Mini Cooper 12 03-09-2008 01:36 AM
Noticeable 'thump' sound when shifting.. Ski 3-Series (E36) 15 03-18-2007 07:04 PM
thump thump thump ekalmus 3-Series (E36) 5 02-23-2004 08:30 PM
*Thump* while braking AZ325Ci 3-Series (E46, E90) 17 02-07-2004 09:41 PM
Auto Trans Thump JL380 3-Series (E36) 1 10-02-2003 12:24 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 02:21 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.