E90Post
 


Extreme Power House
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > BMW Coding > DDE Diesel Electronics modules



Reply
 
Thread Tools Search this Thread
      01-07-2013, 04:58 PM   #1
coopersim
Captain
United Kingdom
44

 
coopersim's Avatar
 
Drives: VW Lupo
Join Date: Apr 2009
Location: Berks


Posts: 775
iTrader: (2)

DDE Diesel Electronics modules

I've had a rough idle at start-up issue for a while now, I've got the codes off the car, and it's showing:

4252 DDE: Glow plug, cylinder 5, activation - Open Circuit - Fault currently present - fault would......... (then it goes off the edge of the screen)

Would one faulty glow plug cause such uneven idling?

Also, I can't seem to access any of the three DDE Diesel Electronic modules listed in DIS to be able to interrogate the system further, any idea why this is?
Appreciate 0
      01-07-2013, 06:42 PM   #2
Cloud1515
Autobahnraser
Germany
0

 
Cloud1515's Avatar
 
Drives: 2008 e92 325d
Join Date: Sep 2012
Location: Germany


Posts: 7
iTrader: (0)

Faulty glow plugs can cause uneven idling but only for a few seconds after cold start.
Appreciate 0
      01-07-2013, 06:50 PM   #3
coopersim
Captain
United Kingdom
44

 
coopersim's Avatar
 
Drives: VW Lupo
Join Date: Apr 2009
Location: Berks


Posts: 775
iTrader: (2)

Only one out of 6 though?
Appreciate 0
      01-07-2013, 07:19 PM   #4
Elliott@DetailAddict
Brigadier General
United_States
101

 
Drives: E90
Join Date: May 2011
Location: Santa Clara, CA


Posts: 4,448
iTrader: (0)

Yes. Just like 1 faulty spark plug can cause a rough idle or misfire for gassers.
Appreciate 0
      01-07-2013, 08:47 PM   #5
hugus311
Titanium silver + Sport + Premium
United_States
14

 
hugus311's Avatar
 
Drives: 2006 330i (E90)
Join Date: Nov 2009
Location: west covina 626


Posts: 631
iTrader: (6)

Quote:
Originally Posted by Grant@DetailAddict
Yes. Just like 1 faulty spark plug can cause a rough idle or misfire for gassers.
But unlike spark plugs which are constantly being ran when vehicle is on, glow plugs are only used to heat up the chamber and then not used again until you re turn on a cold car. So a bad glow plug will cause even idle ing but only until fully warmed
Appreciate 0
      01-08-2013, 12:38 PM   #6
Elliott@DetailAddict
Brigadier General
United_States
101

 
Drives: E90
Join Date: May 2011
Location: Santa Clara, CA


Posts: 4,448
iTrader: (0)

I understand that.
I was equating how just one can cause the idle to be rough just like only 1 spark plug can do that to gassers.
Appreciate 0
      01-08-2013, 03:29 PM   #7
4EST
Private
1

 
4EST's Avatar
 
Drives: E90 318d LCI
Join Date: Oct 2012
Location: Brasov, RO


Posts: 81
iTrader: (0)

you would hardly notice 1 bad glow plug. Even with 3/6 glow plugs malfunctioning your car could start perfectly up to ~-15C
My older E46 had busted relay (so 4/4 glow plugs were not working), and at ~-20C it would crank ~3 sec more.

if you have rough idle, then look more to injectors and air intake

you might be needing ICOM or ICOM emulator to access DDE with ISID
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


All times are GMT -5. The time now is 07:30 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST