E90Post
 


Horizon LED
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > What does a Misfire feel like?



Reply
 
Thread Tools Search this Thread
      02-19-2013, 05:50 PM   #1
WhatADream
Private
1
Rep
86
Posts

 
Drives: 335i Sedan 09'
Join Date: Sep 2012
Location: California

iTrader: (0)

What does a Misfire feel like?

Hey guys, I am running the Cobb tune, with BMS intake and upgraded downpipes.
Lately, under boost, It will feel like a couple hard studders while accelerating. especially in 4th gear. Also while idle, itll be smooth, with an occasional small burp. No codes. WTF is going on?
I ordered new plugs, hope that helps!
Is this common?
__________________
09' 335i Sedan
Appreciate 0
      02-19-2013, 09:02 PM   #2
Greatdane84
Leeeroy Jankins
Greatdane84's Avatar
United_States
7
Rep
403
Posts

 
Drives: 335i e90 LCI
Join Date: Jan 2013
Location: SW Florida

iTrader: (1)

Garage List
2009 335i  [5.00]
From my understanding you can watch the cobb YouTube video or one on their site (http://www.cobbtuning.com/BMW-335i-xi-i-xDrive-s/1200.htm) you should be able to log your car with your cobb and look for a misfire. The video is for replacing.

Just a suggestion before going through the disassembly.
__________________
e90 LCI w/ -= VRSF 7" FMIC =-
-= Cobb: Stg1 +FMIC Aggressive ST =-
Last Install: BMS DCI + Caliper/Drum Paint

"If you're not 1st, you're last" -Ricky Bobby
Appreciate 0
      02-19-2013, 10:21 PM   #3
PDXBMW
Enlisted Member
0
Rep
37
Posts

 
Drives: 2008 335i SEDAN
Join Date: Dec 2012
Location: PORTLAND OREGON

iTrader: (0)

ask you're girl or boyfriend
Appreciate 0
      02-19-2013, 10:23 PM   #4
fazi13
Private
United_States
0
Rep
80
Posts

 
Drives: 2008 335i Manual
Join Date: Feb 2013
Location: SF Bay Area

iTrader: (0)

Garage List
2008 BMW 335i  [0.00]
I believe a misfire is most noted when in idle and the car won't be very smooth at all. So I don't believe its a misfire.. maybe a bad clutch when downshifting to accelerate?
Appreciate 0
      02-19-2013, 10:25 PM   #5
MrRetep
First Lieutenant
MrRetep's Avatar
9
Rep
359
Posts

 
Drives: 435i M-Sport
Join Date: Jan 2012
Location: Irvine CA

iTrader: (3)

feels like a damn earthquake and usually pops a code. use the cobb to scan for codes and report back.
Appreciate 0
      02-20-2013, 08:21 AM   #6
HK-E93
Private
0
Rep
88
Posts

 
Drives: 2007 E93
Join Date: Oct 2011
Location: St. Louis, MO

iTrader: (0)

The car vibrates like hell, you can feel it easily. It usually happens under hard acceleration, it used to happen only when i had the tune on and I pushed the car. The car will hesitate a bit, you might think its a fuel pump issue but no it was my plugs...
Appreciate 0
      02-20-2013, 11:36 AM   #7
marine24
Private
United_States
0
Rep
81
Posts

 
Drives: 07 335i
Join Date: Aug 2012
Location: Southern California

iTrader: (0)

Garage List
Had a similar problem and it turned out to be one of my plugs. When I replaced them one of the electrodes was gone, therefore not making as spark at all. It also threw a misfire code on me. Once I replaced the plugs it didn't come back
Appreciate 0
      02-20-2013, 01:21 PM   #8
WhatADream
Private
1
Rep
86
Posts

 
Drives: 335i Sedan 09'
Join Date: Sep 2012
Location: California

iTrader: (0)

Great guys! my plugs arrive today, so I will report back and let you all know. Perhaps Ill take pics of old plugs and new plugs for comparison.
I have about 30k on current plugs. of the 30, perhaps 15 are on the cobb tune.
__________________
09' 335i Sedan
Appreciate 0
      02-20-2013, 01:34 PM   #9
Hybrid For Life
Banned
Germany
43
Rep
2,119
Posts

 
Drives: Out of Spec
Join Date: Nov 2011
Location: Santa Barbara, CA

iTrader: (4)

Yup sounds like new plugs are in need. Report back.
Appreciate 0
      02-21-2013, 04:42 PM   #10
WhatADream
Private
1
Rep
86
Posts

 
Drives: 335i Sedan 09'
Join Date: Sep 2012
Location: California

iTrader: (0)

OK guys. PROBLEM solved!! I just installed the new plugs and everything is extremely smooth! I feel like I have recovered some power too. Keep in mind, I also just replaced a failed turbo leaking oil all over the place on the intake and exahust about 1k miles ago. (I used to have to add a quart of oil every 1k miles. So far my oil is still full)
Here are some pics.

New


Old plugs are in line from Cyl 1-6. What do you guys suggest that could have been wrong.



Kind of a bonus pic. Bottom of engine cover... Looks like spongy material that could be insulating heat.
__________________
09' 335i Sedan
Appreciate 0
      02-22-2013, 06:34 AM   #11
marine24
Private
United_States
0
Rep
81
Posts

 
Drives: 07 335i
Join Date: Aug 2012
Location: Southern California

iTrader: (0)

Garage List
looks like cylinder 1 was running rich, or getting oil in the cylinder. How many miles on the car? You might want to consider cleaning the intake valves i.e. walnut blasting
Appreciate 0
      02-22-2013, 02:07 PM   #12
WhatADream
Private
1
Rep
86
Posts

 
Drives: 335i Sedan 09'
Join Date: Sep 2012
Location: California

iTrader: (0)

Quote:
Originally Posted by marine24 View Post
looks like cylinder 1 was running rich, or getting oil in the cylinder. How many miles on the car? You might want to consider cleaning the intake valves i.e. walnut blasting
Yes, I agree. I might get that done soon.
It was for sure getting oil in the cylinder because the turbo was bad and I was losing 1 quart of oil every 1k miles.
Now that is fixed. Hope all stays strong.
__________________
09' 335i Sedan
Appreciate 0
      02-24-2013, 01:52 AM   #13
marine24
Private
United_States
0
Rep
81
Posts

 
Drives: 07 335i
Join Date: Aug 2012
Location: Southern California

iTrader: (0)

Garage List
at least you plugs didn't look like this when you pulled them out. This was my #6. Notice the electrode is gone
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
Forum Jump


All times are GMT -5. The time now is 04:36 AM.




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