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 > Z Series > E85 / E86 Z4 (2003-2008)

E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

Reply
 
Thread Tools Display Modes
  #1  
Old 06-09-2013, 02:10 PM
Nova2k7 Nova2k7 is offline
Registered User
Location: West Yorkshire
 
Join Date: Jun 2013
Posts: 13
Mein Auto: 3.0 Z4
Angry Z4 Lots Of Lights On Dash

ok so this starts about 12 months ago when one day i got in the car and put my foot on the break and the car didnt idle correctly! the revs jump widely up and down and sometimes almost stall!! ive also noticed that when my foot is on the break pedal and the gas peddle is pressed the car does not rev?? the rpm just slowly climes to about 1200rpm and then stops, then as you take your foot from the peddles the cars rpm drops so that the car almost stalls. now during this time ive had no lights on the dash and once the car warms the symptoms are less. sometimes at lights when the breaks are pressed the rmp climbs to 1000rpm and the drops once the breaks are released. now from the research ive done over the last twelve months ive been led to think this could be an issue with the break servo? although my indy says all the lines to the servo look fine and cant see any leaks which could cause a vacuum leak!

video


now today i was coming home and had some of the following lights come up!



im now completely stumped as to what the problem might be and where to start looking to get this resolved!_a_
Reply With Quote
Advertisement
  #2  
Old 06-11-2013, 03:02 PM
Living Dead Living Dead is offline
ZEDHEAD
Location: New York
 
Join Date: May 2011
Posts: 129
Mein Auto: 2006 Z4 3.0i
I've had a similar experience with a dash of many lights and rough running in my 2006 3.0i, the ultimate solution was to replace the ECU which had fried itself and the car was in limp home mode.
__________________

“Thou art to me a delicious torment.” Ralph Waldo Emerson
Reply With Quote
  #3  
Old 06-11-2013, 03:04 PM
Nova2k7 Nova2k7 is offline
Registered User
Location: West Yorkshire
 
Join Date: Jun 2013
Posts: 13
Mein Auto: 3.0 Z4
Quote:
Originally Posted by Living Dead View Post
I've had a similar experience with a dash of many lights and rough running in my 2006 3.0i, the ultimate solution was to replace the ECU which had fried itself and the car was in limp home mode.
The car itself runs fine! Pulls like a train! This only happens when the breaks are applied!
__________________
Mods - Stubby, Clear Break Light, Clear Indicators, Clear Rear Lights, sprayed Grills & GapTech Mod!
Reply With Quote
  #4  
Old 06-11-2013, 03:44 PM
vintage42's Avatar
vintage42 vintage42 is online now
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 1,613
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Nova2k7 View Post
... only happens when the breaks are applied!
Brakes.
Reply With Quote
  #5  
Old 06-11-2013, 09:36 PM
Blacklane Blacklane is online now
Officially Welcomed to the 'Fest
Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 1,121
Mein Auto: 1998 Z3 Roadster
Long shot here: I've heard of the trunk lid wire harness having several broken wires right at the hinge that causes some strange behavior when the brakes are applied. You might want to open the rubber sleeve and have a look. BMW also recommends removing the middle plastic clip on that harness.
Reply With Quote
  #6  
Old 06-12-2013, 01:30 AM
Nova2k7 Nova2k7 is offline
Registered User
Location: West Yorkshire
 
Join Date: Jun 2013
Posts: 13
Mein Auto: 3.0 Z4
Quote:
Originally Posted by Blacklane View Post
Long shot here: I've heard of the trunk lid wire harness having several broken wires right at the hinge that causes some strange behavior when the brakes are applied. You might want to open the rubber sleeve and have a look. BMW also recommends removing the middle plastic clip on that harness.
I would never of thought of this in a million years! Not sure how I go about checking that lol
__________________
Mods - Stubby, Clear Break Light, Clear Indicators, Clear Rear Lights, sprayed Grills & GapTech Mod!
Reply With Quote
  #7  
Old 06-12-2013, 05:20 AM
vintage42's Avatar
vintage42 vintage42 is online now
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 1,613
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Blacklane View Post
... BMW also recommends removing the middle plastic clip on that harness.
That would be Post #5 in this thread:
http://www.bimmerfest.com/forums/sho...d.php?t=609801
Quote:
Originally Posted by Nova2k7 View Post
... Not sure how I go about checking that lol
Some people cut the sheath of the harness to inspect the wires, to look for bare insulation or breaks. Be careful, as it is possible to cut a wire as in Post #11 in this thread:
http://www.bimmerfest.com/forums/sho...d.php?t=511230
Cutting the original rubber sheath then exposes the harness to water. I would first try to pull the ends of the rubber sheath out of the body, and move it back and forth on the harness to expose the wires for inspection.
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E85 / E86 Z4 (2003-2008)
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 08:47 PM.


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