F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Cylinder misfires after downpipe change
GetBMWParts
Post Reply
 
Thread Tools Search this Thread
      03-15-2019, 07:54 PM   #23
BMW DIY Guy
Major
522
Rep
1,020
Posts

Drives: 2014 435i
Join Date: Jan 2017
Location: Maple Valley WA

iTrader: (0)

Garage List
2014 BMW 435i  [0.00]
Wooohoooooo!!!

Success! So THANK you to everyone for all of the info, feedback and suggestions. A full reinstall, with O2s torqued down and the lower V band installed properly and everything is amazing!

So no cylinder misfires as per the false (historical) positive led me down the wrong path at first, but it was the lower v band causing the POOF sounds and stumbles. She pulled clean and strong in all of the test runs.

thanks again all, this forum rocks!
__________________
Check out my BMW DIY Channel on YouTube!
F32, F80, E39, E46, E53, and E83 projects from Active Autowerke, TuningTechFS, Awron, AvinUSA, Karbonius Composites and more!
** YouTube BMW DIY Guy **
** Facebook BMW DIY Guy **
Appreciate 1
amw896415.50

      03-16-2019, 01:59 AM   #24
TEST DRYVER
Second Lieutenant
TEST DRYVER's Avatar
United_States
76
Rep
207
Posts

Drives: 2015 BMW 335i M-sport
Join Date: Apr 2015
Location: Scottsdale, AZ

iTrader: (0)

Quote:
Originally Posted by BMW DIY Guy View Post
Wooohoooooo!!!

Success! So THANK you to everyone for all of the info, feedback and suggestions. A full reinstall, with O2s torqued down and the lower V band installed properly and everything is amazing!

So no cylinder misfires as per the false (historical) positive led me down the wrong path at first, but it was the lower v band causing the POOF sounds and stumbles. She pulled clean and strong in all of the test runs.

thanks again all, this forum rocks!
Excellent! That's good news! No actual car enthusiast likes to hear problems with their cars or mods. It seems like it's ok to spend money on mods and maitinence, but definitely NOT ok to spend money to fix what we broke =) the irony...
Appreciate 1
      03-16-2019, 12:38 PM   #25
GPM
Private First Class
151
Rep
178
Posts

Drives: 2015 335i
Join Date: Mar 2016
Location: Arizona

iTrader: (0)

Ya know Stefan, I've heard there are these things called YouTube videos that supposedly show you how to do this stuff right.

You might want to check them out, just sayin...
__________________
Mineral Gray - Active Autowerke Stage 2 - MPerformance Suspension - VRSF CP - CTS Turbo IC - Catted Fabspeed - Akrapovic - HRE FF15
Appreciate 1
      03-16-2019, 01:04 PM   #26
BMW DIY Guy
Major
522
Rep
1,020
Posts

Drives: 2014 435i
Join Date: Jan 2017
Location: Maple Valley WA

iTrader: (0)

Garage List
2014 BMW 435i  [0.00]
Quote:
Originally Posted by GPM View Post
Ya know Stefan, I've heard there are these things called YouTube videos that supposedly show you how to do this stuff right.

You might want to check them out, just sayin...
Hahahaha.. I know right?! *laugh* The false positive really threw me for a loop but the moment I got back under the car and could see that rear v band, I knew (at least one thing) what was wrong. 8)

Just had the thing slightly cockeyed on the top where I couldn't see it, and I dont think anywhere near tight enough. My new uber digital torque wrench that arrived this week did the job there.
__________________
Check out my BMW DIY Channel on YouTube!
F32, F80, E39, E46, E53, and E83 projects from Active Autowerke, TuningTechFS, Awron, AvinUSA, Karbonius Composites and more!
** YouTube BMW DIY Guy **
** Facebook BMW DIY Guy **
Appreciate 0
      03-16-2019, 03:48 PM   #27
bqik
Enlisted Member
14
Rep
37
Posts

Drives: 435i
Join Date: Feb 2018
Location: Andorra

iTrader: (0)

Quote:
Originally Posted by BMW DIY Guy View Post
Hahahaha.. I know right?! *laugh* The false positive really threw me for a loop but the moment I got back under the car and could see that rear v band, I knew (at least one thing) what was wrong. 8)

Just had the thing slightly cockeyed on the top where I couldn't see it, and I dont think anywhere near tight enough. My new uber digital torque wrench that arrived this week did the job there.
subscribed!

you give all the bad and good info.

what are your next steps for the 435i?
Appreciate 1
      03-16-2019, 04:18 PM   #28
BMW DIY Guy
Major
522
Rep
1,020
Posts

Drives: 2014 435i
Join Date: Jan 2017
Location: Maple Valley WA

iTrader: (0)

Garage List
2014 BMW 435i  [0.00]
Quote:
Originally Posted by bqik View Post
Quote:
Originally Posted by BMW DIY Guy View Post
Hahahaha.. I know right?! *laugh* The false positive really threw me for a loop but the moment I got back under the car and could see that rear v band, I knew (at least one thing) what was wrong. 8)

Just had the thing slightly cockeyed on the top where I couldn't see it, and I dont think anywhere near tight enough. My new uber digital torque wrench that arrived this week did the job there.
subscribed!

you give all the bad and good info.

what are your next steps for the 435i?
Next up is a TuningTechFS HPFP, really excited for that as also prep for a turbo upgrade. I also have an Awron gauge system in route which will be fun!

I also am working on suspension in the future, with very likely Bilstein B16s and a BBK on the radar.
__________________
Check out my BMW DIY Channel on YouTube!
F32, F80, E39, E46, E53, and E83 projects from Active Autowerke, TuningTechFS, Awron, AvinUSA, Karbonius Composites and more!
** YouTube BMW DIY Guy **
** Facebook BMW DIY Guy **
Appreciate 0
      03-17-2019, 07:22 AM   #29
ceedawg
Major
ceedawg's Avatar
414
Rep
1,281
Posts

Drives: 2k15 335i xdrive MSport 6spd
Join Date: Dec 2017
Location: Big City

iTrader: (0)

Quote:
Originally Posted by BMW DIY Guy View Post
Next up is a TuningTechFS HPFP, really excited for that as also prep for a turbo upgrade. I also have an Awron gauge system in route which will be fun!

I also am working on suspension in the future, with very likely Bilstein B16s and a BBK on the radar.
Glad you fixed this Have you tried ethanol yet and which turbo upgrade are you going with?

I was also advised to gap my plugs 22 to 25 with the stock turbo and high boost.
__________________
2k15 335i Msport xdrive 6spd Wagner Comp2 FMIC,FTP CP,stock exhaust. Fabspeed Sport catted DP, ACS springs. FBO BM3 Stg 2
Wish list Big Turbo kit Yes! PS2 Nope!
Appreciate 0
      03-17-2019, 07:26 AM   #30
BMW DIY Guy
Major
522
Rep
1,020
Posts

Drives: 2014 435i
Join Date: Jan 2017
Location: Maple Valley WA

iTrader: (0)

Garage List
2014 BMW 435i  [0.00]
Quote:
Originally Posted by ceedawg View Post
Quote:
Originally Posted by BMW DIY Guy View Post
Next up is a TuningTechFS HPFP, really excited for that as also prep for a turbo upgrade. I also have an Awron gauge system in route which will be fun!

I also am working on suspension in the future, with very likely Bilstein B16s and a BBK on the radar.
Glad you fixed this Have you tried ethanol yet and which turbo upgrade are you going with?

I was also advised to gap my plugs 22 to 25 with the stock turbo and high boost.
No E85 yet.. really focus my build on pump gas. I may throw in some octane boost come "test and tune" days in a few months.

The turbo I am hoping for is an unannounced product as of yet.. really really hoping there is big news in the next 30 days on that. 8)
__________________
Check out my BMW DIY Channel on YouTube!
F32, F80, E39, E46, E53, and E83 projects from Active Autowerke, TuningTechFS, Awron, AvinUSA, Karbonius Composites and more!
** YouTube BMW DIY Guy **
** Facebook BMW DIY Guy **
Appreciate 0
      03-17-2019, 02:47 PM   #31
bqik
Enlisted Member
14
Rep
37
Posts

Drives: 435i
Join Date: Feb 2018
Location: Andorra

iTrader: (0)

Quote:
Originally Posted by BMW DIY Guy View Post
Next up is a TuningTechFS HPFP, really excited for that as also prep for a turbo upgrade. I also have an Awron gauge system in route which will be fun!

I also am working on suspension in the future, with very likely Bilstein B16s and a BBK on the radar.

B16 is the first thing I did.

After 100.000miles with them I can confirm that sway bars is a must to replace in a F32.

regards
Appreciate 1
      03-19-2019, 10:48 AM   #32
XutvJet
Colonel
1780
Rep
2,610
Posts

Drives: 2016 M235 6MT
Join Date: Mar 2016
Location: Kansas City

iTrader: (-1)

Is the car still driving/performing as it should? It seems odd to me that a minor exhaust leak downstream of the oxygen sensors would create CELs and poor driveability. A motor, ECU, sensors, etc. tend not to care what's going beyond the last line of analysis (i.e., the O2 sensors), especially a minor exhaust leak. No exhaust v-band, gasket, etc. is ever air tight and they all leak to some extent.

I wonder if the problem is/was simply a matter of a minor issue with the Stage 2 tune, colder plugs, the downpipe and it's less effective cats (compared to the HJS cats used by Fabspeed and HJS), and oxygenated winter gas. It seems like most that have driveability issues with tunes are those running downpipes and sometimes pushing an aggressive map.
__________________
Country over party
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


All times are GMT -5. The time now is 03:57 PM.




f30post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, 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