European Auto Source
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Odd problem - intermittent misfire?

Thread Tools Search this Thread
      09-10-2012, 04:08 PM   #1
Real Goon
See5's Avatar
Drives: Nothing
Join Date: Jul 2011
Location: Atlanta

Posts: 349
iTrader: (0)

Odd problem - intermittent misfire?

Unlike most of you in the section my car is completely bone stock. I was going to change that soon but life got in the way as well as this random problem.

Every once in awhile under light throttle loads ie going up a hill on the highway at 60-70mph, the car will judder for about 2 seconds, at least enough for me notice the tach needle move with the event. Sometimes it happens while passing as well. It will then drive like nothing happened. Never had any problems at WOT.

I have an appointment with the dealer as the car is still under CPO warranty but the only problem is that it has never set off any visible CELs and is almost totally random. Without the codes, it just seems like there will be high probability that they tell me to go home and run some fuel system cleaner.

The car currently has 54K on it. I bought it at 44K but didn't know if any of the ignition system had any previous work done to it. They replaced the valve cover gasket at 50K along with the LPFP. Maybe some oil had previously leaked down to the plugs? Coils, plugs, and injectors typically have different symptoms but what are they for this platform in owner's experiences?

Last edited by See5; 09-10-2012 at 04:14 PM.
See5 is offline   United_States
Reply With Quote
      09-10-2012, 04:12 PM   #2
Major General
enrita's Avatar
Drives: 335i - Big turbos
Join Date: Sep 2008
Location: Italian in Sweden

Posts: 7,323
iTrader: (0)

try to take off the plugs and see how they look.
07 335i AT - TD St.2 Turbos - COBB (Custom Cobb mapping by http://www.protuningfreaks.com/) - JB4G5 ISO - Okada Coils - NGK 5992 Plugs - E85 Walbro - Injen Intake - Helix IC - Snow Stg. 3 - Stett CP - AR DPs - midpipes 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - Level 10 AT upgrade - Alpina AT Flash
enrita is offline   Sweden
Reply With Quote
      09-10-2012, 06:10 PM   #3
Some dude
Drives: E28 M5, E92 335i
Join Date: Sep 2011
Location: Northern VA

Posts: 1,664
iTrader: (0)

Take the shotgun blast approach: New plugs, new pre-cat O2 sensors, clean intake ports, clean MAP sensors. I had to track down a similar low load misfire issue as well, did all that with injectors, too, but they didn't help much. At least not enough to justify $700 in parts alone. The things that helped the most were the pre cat O2 sensors and cleaning the MAP sensors.
RRT Racing
E92 335i/6MT Dinan Stage 3: intercooler, oil cooler, intake, flash, exhaust, LW dual-mass flywheel.
Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350
JamesM3M5 is offline   United_States
Reply With Quote
      09-11-2012, 07:52 AM   #4
BimmerPost Supporting Vendor

Drives: 07335i
Join Date: Dec 2008
Location: Earth

Posts: 14,486
iTrader: (86)

Originally Posted by enrita View Post
try to take off the plugs and see how they look.
+1 or just change them. The service interval BMW recommends on these plugs is ridiculous.

Mike@N54Tuning.com is offline   Canada
Reply With Quote


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 04:29 AM.

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