E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 2008 328i Coupe Rough Idle



Reply
 
Thread Tools Search this Thread
      11-12-2017, 07:01 AM   #1
rkennedy
Registered
United_States
0
Rep
2
Posts

Drives: 2008 328i Coupe
Join Date: Oct 2016
Location: San Diego

iTrader: (0)

Garage List
2008 328i Coupe Rough Idle

I have a 2008 328i coupe with 87xxx miles on.
Recently my engine has been having a rough start and stumbling idle.
Itís definitely worse on a cold engine and havenít really noticed it once the oil temp gets to normal operating temp.I try to warm up the engine as much as possible before driving it but unfortunately I mostly drive 2-3 miles to and from work daily in stop and go traffic. It will stumble when I come to a stop, doesnít go below 500rpms but still stumbles.
I recently did an oil change with Mobil ďEuropeanĒ 0W-40(have been for the past two years and always changed before 3000 miles since the last one.) I always clean my air intake when I change my oil, K&N filter.
Changed spark plugs at the same time with NGK Iridium.
I do have a Oil Pan Gasket leak, but donít see how it would be related, I check my oil level regularly.
My bimmer is a SULEV, if youíre unaware, anything emissions related gets fixed by the dealership for free in California by law. Which I have taken advantage of in the past. That being said, before I take it in I want to make sure I donít have to pay for the diagnostic if it isnít emissions related, which I donít believe it is.
One more note, before I made this post, I plugged my OBD II in on a cold start and didnít get any codes.
Appreciate 0
      11-14-2017, 08:41 PM   #2
gunnerxq
Lieutenant Colonel
gunnerxq's Avatar
United_States
134
Rep
1,550
Posts

Drives: e90 "325i"
Join Date: Sep 2010
Location: Staten Island and Albany

iTrader: (0)

Maybe this?
http://www.pelicanparts.com/BMW/tech..._Replacing.htm
Appreciate 0
      11-15-2017, 12:19 PM   #3
crazythedon
Private
11
Rep
93
Posts

Drives: 2011 BMW tree2treei
Join Date: Jan 2017
Location: Toronto

iTrader: (0)

^^

You can try cleaning them first. Takes 5 mins.

Appreciate 0
      11-21-2017, 01:11 AM   #4
3002 tii
Lieutenant General
3002 tii's Avatar
United_States
806
Rep
10,715
Posts

Drives: E86, E90, F25
Join Date: Apr 2008
Location: CT

iTrader: (85)

Garage List
Changed plugs but what about ignition coils?
__________________
Active Autowerke | Supersprint | TC Kline | Ground Control | MFactory | Volks | Nitto

NASA NE TT5 #821
Appreciate 0
      11-21-2017, 10:17 AM   #5
rkennedy
Registered
United_States
0
Rep
2
Posts

Drives: 2008 328i Coupe
Join Date: Oct 2016
Location: San Diego

iTrader: (0)

Garage List
Havenít changed the coils. Cleaned both intake and outtake solenoids. Helped a little but I have felt a few hiccups still. Itís a little better but I donít think it fixed the enitire problem.
Appreciate 0
      11-21-2017, 05:46 PM   #6
tom.gnade
3IM, AA tune, Euro/Rev intake
United_States
43
Rep
188
Posts

Drives: 2013 328i coupe
Join Date: May 2016
Location: Forest Hill, MD

iTrader: (1)

I recently had a very similar problem, turned out to be ignition coil on cylinder 5. I had the shop do it since it was already there but it looks like they can be done pretty easily. They said the Coils fail frequently. It looks like there is an updated version, I think all 6 coils were on sale for maybe 160 at FCP. I may just change them all out at next oil change with new plugs.
Appreciate 0
      11-30-2017, 08:41 PM   #7
Steadyhand
New Member
4
Rep
8
Posts

Drives: E90
Join Date: Feb 2012
Location: Virginia

iTrader: (0)

Could also be your fuel injectors. Does your car smell of gasoline when first started after sitting for 7+ hours (particularly when it's cold outside)?

If so, that could explain rough starts and it getting better after coming to normal operating temp, because the inside seals in your injectors could be worn, thus letting small amounts of fuel to leak through after sitting (post fuel rail, of course).

This was happening for my 328 and 330 (both e90) and the solution was installing refurbished fuel injectors (w/new seals, cleaned, new o-rings, etc.). Cost was extremely reasonable and the DIY was maybe a 4 out of 10 (1 1/2 hours in my driveway).
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 -4. The time now is 05:20 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, 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