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 12-10-2010, 08:39 PM
preed preed is offline
Registered User
Location: marianna
 
Join Date: Dec 2010
Posts: 3
Mein Auto: 98 740i bmw
Unhappy Rough idle/check engine light flashing

Hello, i need some help figuring out why my 98 740i is idiling rough. It gives me a code for a mis fire on cylinder #1. It also seems to spit and sputter at times when i press the gas pedal. Not sure what's going on but my bimmer sounds like a small truck now. HELP!!!!!
Reply With Quote
Ads by Google
  #2  
Old 12-10-2010, 08:47 PM
cntlaper1 cntlaper1 is offline
Registered User
Location: hartford, CT
 
Join Date: Nov 2010
Posts: 6
Mein Auto: 135I
i guess it could be many things from the ignition coil being faulty, fouled spark plug, bad injector or in some cases engine mechanical damage like a broken valve spring for that cylinder. i would swap coils around and see if the coil that comes off cylinder 1 travels to the cylinder that you installed it into. mark them so you dont forget. those coils fail frequently. cylinder 1 is the closest to the coolant reservour tank.
Reply With Quote
  #3  
Old 12-10-2010, 09:57 PM
preed preed is offline
Registered User
Location: marianna
 
Join Date: Dec 2010
Posts: 3
Mein Auto: 98 740i bmw
Mis Fire on Cylinder 1/Rough Idle

Hello, i need some help figuring out why my 98 740i is idiling rough. It gives me a code for a mis fire on cylinder #1. It also seems to spit and sputter at times when i press the gas pedal. Not sure what's going on but my bimmer sounds like a small truck now. HELP!!!!!
Reply With Quote
  #4  
Old 12-11-2010, 06:43 AM
GLHExorcist GLHExorcist is offline
Registered User
Location: Gatineau Quebec Canada
 
Join Date: Dec 2010
Posts: 16
Mein Auto: 1995 740i
Valve cover gaskets are prone to leak as they get hard and brittle from underhood heat. First step is to, like cntlaper1 said, pull the plugs. Usually, if the VC gaskets are leaking, if you shine a light down the plug hole before taking the plug out, you will see oil. You will also see oil on the tip of the coilpack (where it meets with the plug) if the leak is bad enough. This will cause a misfire and foul the plugs in question.

Hope this helps!

Last edited by GLHExorcist; 12-11-2010 at 06:44 AM.
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 08:01 PM.


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