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 > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

Reply
 
Thread Tools Display Modes
  #1  
Old 12-28-2012, 09:44 PM
whakin whakin is offline
Registered User
Location: Chicago Suburbs
 
Join Date: Dec 2012
Posts: 7
Mein Auto: 1985 325e
Exclamation 1985 e30 325e unexplained surging idle

I have been through the threads all over online for months now..nothing has helped. I have an erratic surging idle, the idle varies from consistent high about 1200rpm's to surging from 500 to 1200 to surging from 800 to 1800 I've noticed about four different idle patterns now. It occurs approx 90% of the time, the other ten percent it idles about 1000. I replaced most vacuum tubing (all the others are ok, atleast seem to be), replaced the intake elbow. I cleaned and tested the ICV with a 12v source and it operates, I could not find any resistance specs on the two wire set-up ICV. I replaced the coolant temp sensor also. The car sometimes bucks when driving and at certain speeds like 45mph in fifth gear I do not need to touch the throttle, the car will just keep going due to this idle issue. This has me completely stumped. Any help is very much appreciated!
Reply With Quote
Ads by Google
  #2  
Old 12-28-2012, 11:51 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,271
Mein Auto: E23;E30;E38;E32;E34 +
If you have the 'linier' ICV they can get a dead part on the track. Check with a DMM while moving the valve over its full range.
__________________
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
  #3  
Old 12-28-2012, 11:56 PM
whakin whakin is offline
Registered User
Location: Chicago Suburbs
 
Join Date: Dec 2012
Posts: 7
Mein Auto: 1985 325e
It is the linear one with the two wire plug. DMM? Sorry probably a dumb question. And could I check resistance on it? I have no specs though :/

This seems to make sense though! It would be functioning but not correctly.
Reply With Quote
  #4  
Old 12-29-2012, 10:28 AM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,271
Mein Auto: E23;E30;E38;E32;E34 +
The test is to work the unit through its full range of movement while an ohm meter is connected. There should be a smooth even change in resistance. Any variation (ie a dead bit) will mean a new unit. Sorry I cannot give ohm value range but the dead bit is the give away.
__________________
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
  #5  
Old 12-29-2012, 10:55 AM
whakin whakin is offline
Registered User
Location: Chicago Suburbs
 
Join Date: Dec 2012
Posts: 7
Mein Auto: 1985 325e
Awesome! Thank you very much, hopefully this is the problem. I will reply back with my findings!
Reply With Quote
  #6  
Old 12-29-2012, 11:15 AM
whakin whakin is offline
Registered User
Location: Chicago Suburbs
 
Join Date: Dec 2012
Posts: 7
Mein Auto: 1985 325e
Ok, just ran the test and all along it's movement it remained a constant 8-9ohms of resistance. It averaged about 8.4 but never dropping below 8 or ranging above 9. I'm guessing that means the ICV is still good?
Reply With Quote
  #7  
Old 12-29-2012, 12:33 PM
hornhospital's Avatar
hornhospital hornhospital is offline
D'oh, You kids!
Location: In the Grumpy Chair
 
Join Date: Jan 2008
Posts: 14,126
Mein Auto: 1995 318is / 1993 325is
DMM= Digital Multi-Meter

You should have had a range of readings from full closed to full open. An unchanging reading of 8-ish ohms indicates the ICV is dead.
__________________
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

Reply With Quote
  #8  
Old 12-29-2012, 02:01 PM
whakin whakin is offline
Registered User
Location: Chicago Suburbs
 
Join Date: Dec 2012
Posts: 7
Mein Auto: 1985 325e
Alright sounds good! Does anyone know of a good place to buy these from? Everywhere I look they're about $200...little pricey
Reply With Quote
  #9  
Old 12-29-2012, 04:04 PM
hornhospital's Avatar
hornhospital hornhospital is offline
D'oh, You kids!
Location: In the Grumpy Chair
 
Join Date: Jan 2008
Posts: 14,126
Mein Auto: 1995 318is / 1993 325is
Rockauto has them for about $170. You could always get one from a wrecking yard but reliability could be questionable.
__________________
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)
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 05:02 PM.


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