Idle Surging - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 08-30-2005, 01:13 PM
n00b
 
ducatipaso's Avatar
 
Join Date: Apr 2005
Location: Northern California
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ducatipaso is an unknown quantity at this point
Send a message via AIM to ducatipaso
(Thread Starter)
the victim: 1992 E30 cabrio, DOHC I-4 (M50 i think)
the problem: idle goes up-down-up-down

not a huge change, but like 800 to 1100 RPM.

is this indicative of an old O2 sensor?
i cannot remember the last time it was changed.

other ideas?

<span style='color:blue'><a href='http://tdi.mine.nu' target='_blank'><span style='color:blue'>2001 VW Golf </span><span style='color:red'>TDI</span></a>
<a href='http://k11.mine.nu' target='_blank'><span style='color:blue'>1996 BMW K1100RS</span></a>
1992 BMW E30 318ic
<a href='http://ducatipaso.org' target='_blank'><span style='color:blue'>1988 Ducati 750 Paso</span></a>
</span>
ducatipaso is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 08-30-2005, 01:29 PM
4th Gear Member
 
Bmw1990's Avatar
 
Join Date: Dec 2003
Location: St. Joseph Michigan
Posts: 967
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bmw1990 can only hope to improve
Send a message via AIM to Bmw1990
There could be a vacuum leak somewhere also. I hope you find the problem

<img src='http://img127.imageshack.us/img127/4284/bmwlogo2new17jy.jpg' border='0' alt='user posted image' />
Black 4 door 1990 325i
15&quot;x7.5 Ronal LS-wrapped in 205/50-15 Bridgestone Potenza G009
Bmw1990 is offline  
#3 (permalink) Old 08-30-2005, 02:15 PM
Retired administrator
 
triggrhaapi's Avatar
 
Join Date: Dec 2002
Location: Los Angeles
Posts: 5,996
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute triggrhaapi has a reputation beyond repute
Send a message via AIM to triggrhaapi
do E30s have ICV? That's a common E36 issue. Just a thought.

usually the symptoms of a vacuum leak are dropping revs when clutch in, sometimes motor dies, revs return to normal or somewhat normal.


Addicted to Speed Since 1997
Founding member of the GreenDragon Poo Flingers Club
Founder and Double Member of the 150mph club

Read about my Frankenmotor Project and see how an M50 becomes an S50!!!

No, don't worry. It's cool. I'm taking it back for us.
triggrhaapi is offline  
#4 (permalink) Old 08-30-2005, 03:41 PM
n00b
 
ducatipaso's Avatar
 
Join Date: Apr 2005
Location: Northern California
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ducatipaso is an unknown quantity at this point
Send a message via AIM to ducatipaso
(Thread Starter)
ICV? Idle Control Valve?
This is the same engine that's in an E36 318i

<span style='color:blue'><a href='http://tdi.mine.nu' target='_blank'><span style='color:blue'>2001 VW Golf </span><span style='color:red'>TDI</span></a>
<a href='http://k11.mine.nu' target='_blank'><span style='color:blue'>1996 BMW K1100RS</span></a>
1992 BMW E30 318ic
<a href='http://ducatipaso.org' target='_blank'><span style='color:blue'>1988 Ducati 750 Paso</span></a>
</span>
ducatipaso is offline  
#5 (permalink) Old 08-30-2005, 05:13 PM
1st Gear Member
 
DJProfessor's Avatar
 
Join Date: Apr 2005
Location: I look goooood
Posts: 275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
DJProfessor is an unknown quantity at this point
next time she starts doing it tap your ICV with a mallet, nothing hard mind you, just some love taps and see if she starts to idle fine....if she does then you got yourself a bad ICV.........

but also check for vacuum leaks......even though i am leaning more towards a bad ICV at this junctor.....

sexually assault a member of the VW community? if you belong to dubdojo or swov.org they will gladly circle their wagons and support you.
DJProfessor is offline  
#6 (permalink) Old 08-30-2005, 09:37 PM
n00b
 
ducatipaso's Avatar
 
Join Date: Apr 2005
Location: Northern California
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ducatipaso is an unknown quantity at this point
Send a message via AIM to ducatipaso
(Thread Starter)
so now the $20 question... how to locate the ICV?

honestly, I've had this car for a LONG time and never had to do anything under the hood except oil changes (she's only got 120K miles on her) so bear with me.

I *am* mechanically inclined, I just don't own a shop manual, yet.

<span style='color:blue'><a href='http://tdi.mine.nu' target='_blank'><span style='color:blue'>2001 VW Golf </span><span style='color:red'>TDI</span></a>
<a href='http://k11.mine.nu' target='_blank'><span style='color:blue'>1996 BMW K1100RS</span></a>
1992 BMW E30 318ic
<a href='http://ducatipaso.org' target='_blank'><span style='color:blue'>1988 Ducati 750 Paso</span></a>
</span>
ducatipaso is offline  
#7 (permalink) Old 08-30-2005, 09:51 PM
What? No Autobahn?
 
jrhaile's Avatar
 
Join Date: Jan 2004
Location: Spokane, Wa
Posts: 3,525
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile jrhaile
they don't have ICV but an Idle control module.. it's a box which controls the air control and what not. And if I recall (going on a 91 m20 325) it's by your other computers if I recall. I could be wrong on location though

jrhaile is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E21, E30)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Erratic Idle / Misfire / Cutting out makdolby 3-Series (E36) 12 02-05-2012 08:57 AM
Idle Problems BeelZibub 5-Series (E12,E28, E34, E39, E60) 10 07-10-2005 05:56 AM
Idle Problems '95 325is Burnettm 3-Series (E36) 3 04-26-2005 01:41 PM
surging at idle takaaco 3-Series (E21, E30) 1 08-30-2004 07:47 PM
96 318 surging at idle polvoson 3-Series (E36) 3 05-06-2004 01:41 AM

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

 
For the best viewing experience please update your browser to Google Chrome