BMW X3 Forum
BMW X3 Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
XBimmers | BMW X3 Forum > BMW X3 Forums | E83 (2003-2010) > First Generation BMW X3 General Forum » Hunting Idle on cold start

Post Reply
 
Thread Tools Search this Thread
      03-29-2013, 07:49 PM   #1
Rob1796
New Member
United_States
0
Rep
16
Posts

Drives: 350Z
Join Date: Nov 2008
Location: DFW

iTrader: (0)

Send a message via AIM to Rob1796 Send a message via MSN to Rob1796
Hunting Idle on cold start

I have a pretty decent level of experience with the M54 and S54/S62/S85 motors, and almost as much with the N54, but not much at all with the N52s (I don't really care for it as a motor). So I'm coming to you for some help.

My wife has an 2008 X3 3.0si with around 78k miles. She had an issue last year where the dealer explained that a valve spring had worn down, and as a result the valve itself slipped and bent. Long story short, we ended up replacing the entire head of her motor. Her car was running ok for a bit, however around November she started complaining about her mileage getting worse. I wrote it off as the gas stations around here just switching to winter blend.

The other night I took it out and I noticed on start up it was hunting for idle. Not bad, but very much noticeable. Then today when I was standing outside the car and she started it up, I could clearly hear the car trying to smooth out. It doesn't sound like it would with a bad coil pack (and we had all six replaced when we did the head last year). I just ran some injector cleaner through it (RXP), but it isn't an issue the car experiences warm so I don't know if it just has some dirty injectors.

Has anyone experienced anything like this (Google searches haven't been my friend on this one) and know the fix? I'd like to think it has nothing to do with the new head. Also, it doesn't sound like the lifter tick I've heard in other BMWs.
Appreciate 0
      03-30-2013, 10:06 AM   #2
romanonj
Captain
romanonj's Avatar
11
Rep
842
Posts

Drives: F32 435i xDrive
Join Date: Jan 2012
Location: New Jersey, Ocean County

iTrader: (13)

How is your high rpm acceleration? If it is inconsistent, then it's valvetronic motor. I had similar problem on my x3. Idle and over 3k acceleration was inconsistent. N52s are good engines. My e90 had 132k without any issues, x3 approaching 110k.
__________________
2014 F32 435i xDrive AW/CR Technology/Premium/Adaptive/Winter/Driver Assistance/LEDs
2014 F25 X3 M-Sport Carbon Black, Technology/Premium/Winter/Driver Assistance RETIRED!
2011 e92 335is DCT - Cobb, ETS IC, AFE DCI, BMW PS kit, M3 control arms, various cosmetic improvements RETIRED!
2007 X3 122k miles RETIRED! 2006 e90 330i 132k miles RETIRED!
Appreciate 0
      03-31-2013, 11:32 AM   #3
romanonj
Captain
romanonj's Avatar
11
Rep
842
Posts

Drives: F32 435i xDrive
Join Date: Jan 2012
Location: New Jersey, Ocean County

iTrader: (13)

Thinking more about this, it may be your oxygen sensor. Bad oxygen sensor would set off your SES light though...
__________________
2014 F32 435i xDrive AW/CR Technology/Premium/Adaptive/Winter/Driver Assistance/LEDs
2014 F25 X3 M-Sport Carbon Black, Technology/Premium/Winter/Driver Assistance RETIRED!
2011 e92 335is DCT - Cobb, ETS IC, AFE DCI, BMW PS kit, M3 control arms, various cosmetic improvements RETIRED!
2007 X3 122k miles RETIRED! 2006 e90 330i 132k miles RETIRED!
Appreciate 0
      04-03-2013, 09:19 AM   #4
WPG D33Z
Second Lieutenant
3
Rep
276
Posts

Drives: 2008 135i vert Cobb Stage2
Join Date: Mar 2012
Location: Winnipeg, Canada

iTrader: (0)

Have you checked it for codes? Dirty vanos solenoids can cause this behavior, easy to clean. My X3 ran like a bag of crap until I cleaned mine, now its like a new car! I swear by Ceratec as an oil additive as well.
__________________
2008 SGM 135i Cobb Stage 2 FBO
2008 TS X3 MSport KW V2
Appreciate 0
      04-08-2013, 08:53 AM   #5
Rob1796
New Member
United_States
0
Rep
16
Posts

Drives: 350Z
Join Date: Nov 2008
Location: DFW

iTrader: (0)

Send a message via AIM to Rob1796 Send a message via MSN to Rob1796
Sorry I haven't posted back till now, been real busy with work. I checked the codes, didn't pull any. Top end acceleration is still smooth past 3k. It is about time for an oil change so I'll try the additive. Also ran a bottle of RXP in the last tank, still having the issue on start up.
Appreciate 0
Post 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
Forum Jump


All times are GMT -5. The time now is 09:25 PM.




xbimmers
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, 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