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 > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 09-18-2006, 10:38 PM
MN325iSedan MN325iSedan is offline
Officially Welcomed to the 'Fest
Location: Moorhead, MN
 
Join Date: Feb 2006
Posts: 202
Send a message via AIM to MN325iSedan
Mein Auto: '93 325i
Bad IAT symptoms?

Still trying to diagnose my rough idle when stopping problem. Anyone know what a bad IAT would constitute? Do IATs ever go bad?
__________________
Calypso Red '93 325i
Reply With Quote
Ads by Google
  #2  
Old 09-19-2006, 05:43 AM
Waveho Waveho is offline
Officially Welcomed to the 'Fest
Location: Shenandoah Valley, Virginia
 
Join Date: Jul 2006
Posts: 3,362
Mein Auto: '07 335xi 6MT 4door
Don't know what you have tried thus far, but my rough idle, often ending in a stall, was corrected by replacing the O2 sensor and fuel pump relay. Obviously, could be so many things, but these two relatively cheap fixes completely eliminated the problem. Oh, and two separate so-called "master mechanics" at German boutique garages in the area told me that replacing the O2 wouldn't do anything, and that I should start with replacing the idle control valve and a bunch of other things, starting at $300 and up up up. Electronic diagnostics did not indicate an O2 problem, but there you go. The O2 and relay cost me a grand total of $85 and it idles smooth, NEVER stalls, and runs like a champ.
Reply With Quote
  #3  
Old 09-19-2006, 06:49 AM
Pirate_copy's Avatar
Pirate_copy Pirate_copy is offline
Still here
Location: Devon, UK
 
Join Date: May 2006
Posts: 12,180
Send a message via MSN to Pirate_copy
Mein Auto: M3
have you tried this?

http://www.unitedbimmer.com/kb-e36-icvcleaning.php
__________________
330i M-Sport in Topaz Blue

Edirty6 for life
Reply With Quote
  #4  
Old 09-19-2006, 07:16 AM
MN325iSedan MN325iSedan is offline
Officially Welcomed to the 'Fest
Location: Moorhead, MN
 
Join Date: Feb 2006
Posts: 202
Send a message via AIM to MN325iSedan
Mein Auto: '93 325i
Yup, used that exact writeup 2 weekends ago and cleaned the ICV. The thing is it only idles rough when coming to a stop, after the car has sat for an hour or so, and smooths out after 10 or so minutes.
__________________
Calypso Red '93 325i
Reply With Quote
  #5  
Old 09-19-2006, 07:32 AM
Pirate_copy's Avatar
Pirate_copy Pirate_copy is offline
Still here
Location: Devon, UK
 
Join Date: May 2006
Posts: 12,180
Send a message via MSN to Pirate_copy
Mein Auto: M3
Sounds like it could be a vacuum leak somewhere
__________________
330i M-Sport in Topaz Blue

Edirty6 for life
Reply With Quote
  #6  
Old 09-19-2006, 07:44 PM
Waveho Waveho is offline
Officially Welcomed to the 'Fest
Location: Shenandoah Valley, Virginia
 
Join Date: Jul 2006
Posts: 3,362
Mein Auto: '07 335xi 6MT 4door
If it's a vaccuum problem, check your mass air boot for tears, cracks, or misalignment. Found a rip on the underside of mine which wasn't noticible until I removed it. It's an easy fix if that's the problem; attached by two common hose clamps. New ones are about $40. If you're going to have a vaccuum problem, that's the best place to have one!
Reply With Quote
  #7  
Old 09-20-2006, 01:58 AM
Pirate_copy's Avatar
Pirate_copy Pirate_copy is offline
Still here
Location: Devon, UK
 
Join Date: May 2006
Posts: 12,180
Send a message via MSN to Pirate_copy
Mein Auto: M3
I too had this problem with a tear but only had acceleration problems, she idled fine.

Maybe check your throttle body is clean, she maybe letting in too much air because the butterfly is not closing properly

just take off the intake boot and thoroughly clean the inside of the throttle body with carb cleaner. black tar and deposits build up here and can cause all sorts of problems......FREE FIX!!!
__________________
330i M-Sport in Topaz Blue

Edirty6 for life
Reply With Quote
  #8  
Old 09-20-2006, 10:35 AM
MN325iSedan MN325iSedan is offline
Officially Welcomed to the 'Fest
Location: Moorhead, MN
 
Join Date: Feb 2006
Posts: 202
Send a message via AIM to MN325iSedan
Mein Auto: '93 325i
But the throttle body would be closed when idleing...
__________________
Calypso Red '93 325i
Reply With Quote
  #9  
Old 09-20-2006, 11:32 AM
lesl2 lesl2 is offline
Officially Welcomed to the 'Fest
Location: California
 
Join Date: Mar 2006
Posts: 101
Mein Auto: '97 & '99 M3, '02 530
A torn boot is a pre-throttle valve leak, which I suspect should not cause such a drastic issue such as killing the engine. A post-throttle valve vacuum leak however would cause a condition that would stall an engine during idle. This can be simulated by taking the oil cap off. BTW, did you happen to leave your oil cap off accidentally? If not, then take it off and see if it makes a big difference. It should. If not, get a vacuum meter and test it. I believe you can rent one free from Autozone.
__________________
'97 M3 Auto
'99 M3 5 speed
'02 530i Sport/Premium Package
Reply With Quote
  #10  
Old 09-21-2006, 01:59 AM
Pirate_copy's Avatar
Pirate_copy Pirate_copy is offline
Still here
Location: Devon, UK
 
Join Date: May 2006
Posts: 12,180
Send a message via MSN to Pirate_copy
Mein Auto: M3
The butterfly is closed indeed when idling, but the dirty deposits cause the mixture at idle to be incorrect. They stop the plate from closing completely and so letting more air in than expected. The engine thinks it is closed but more air is getting in than expected. it is the same as the unmetered air Lesl2 is talking about above.

Take the boot off and inspect it, while it is off, you may as well check the throttle body too
__________________
330i M-Sport in Topaz Blue

Edirty6 for life
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Speaking about bad cell service, who hates Sprint as much as I? Jever Off-Topic 12 09-22-2003 09:33 AM
'98 M3 with bad rings. Engine removed today. Emission M Series 5 07-30-2003 10:36 AM
3 damages in one bad day yamato The Detail Department 2 07-03-2003 05:40 PM
m3 CSL.. not bad.. 330iGT General BMW 9 06-28-2003 01:41 PM


All times are GMT -7. The time now is 06:22 PM.


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