E90Post
 


GTB Performance
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > HELP: car is misfiring and throwing codes



Reply
 
Thread Tools Search this Thread
      11-02-2012, 12:15 PM   #1
ramspeed
Private First Class
ramspeed's Avatar
1
Rep
143
Posts

 
Drives: 2008 E92 335i
Join Date: Sep 2012
Location: Gaithersburg Md

iTrader: (1)

Garage List
2008 BMW 335i  [4.50]
I'll give you all a run-down of the past two weeks or so.

Driving around, about two weeks ago, punch it hard, car goes into limp mode.
Take it to pepboys(to diagnose code) but when I turn the car back on, limp mode is gone.

I bought some Seafoam fuel additive, put it in the gas. Everything went fine.

This sunday, I start the car, its running really rough, sounds like it might be misfiring, but no codes show up. Let the engine warm up, rough sound goes away.

Same thing, this whole week.

Then today (Friday) I start the car this morning, and its running more rough than the past couple of days, service engine light comes on, and I have to keep the car at 1000 rpm or higher for fear of stalling.

Start driving to the dealership, after about 5 minutes, car runs like a champ. SESL doesn't go away, so I scan it. Get these codes:

P0301
P0300
P0104

Take it to the stealership, they charge me $140 to say the same thing, and tell me that it might need to have its ECU reflashed, or reset, or whatever.

What is going on?

Like I said, when the car sits for a little while, it runs REALLY hard on startup, but when I drive around for a bit, it seems all better



NOTE: only modifications are dual cone intake, and I unplugged the exhaust diaphragm actuator (to make the exhaust louder on a 335i) I plugged it back in this morning.
Appreciate 0
      11-02-2012, 02:29 PM   #2
CHECKERED
ex deus machina
CHECKERED's Avatar
United_States
7
Rep
420
Posts

 
Drives: 335i E92, 05 Audi S4
Join Date: Oct 2012
Location: a Treacherous Canyon Road in SoCal

iTrader: (5)

Garage List
2005 Audi S4  [0.00]
Miles on the car?

How many miles on spark plugs?

Carbon cleaning ever been done?

Which intake do you have? Some brands position the MAF sensor too low causing all kinds of shenanigans
__________________
Garage Queen: 2005 Audi S4 4.2L V8, Vortech Supercharger, Vented CF Hood, PSS9 Coilovers, Sway-bars, RS4 brakes, Fast Intentions - Cat-less Downpipes & Full Exhaust, 505AWTQ
Daily Driver: E92 335i N54: JB4 G5 ISO28 w/BMS Flash, quaife LSD, BMS Meth, AA sport IC, BMS Charge Pipe, BMS OCC, Euro Light Switch, M-Sport Kit, Z4 35is Front Rotors, Hawk HPS pads, SS brake lines; 12.1@117mph (stock intake stock exhaust, 225ís RFT)
Appreciate 0
      11-02-2012, 02:45 PM   #3
joec500
Brigadier General
46
Rep
3,004
Posts

 
Drives: it has 4 wheels
Join Date: Jul 2008
Location: San Francisco

iTrader: (10)

leaking injector causing a super rich startup condition. Find out which cylinders are mis-firing, replace those injectors. They can be found for 100-150 online for new ones + 8-10 dollars for decoupling units. Then find someone who can help you to code them. There is a great DIY somewhere on the forums.
__________________
2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch
Appreciate 0
      11-02-2012, 04:49 PM   #4
ramspeed
Private First Class
ramspeed's Avatar
1
Rep
143
Posts

 
Drives: 2008 E92 335i
Join Date: Sep 2012
Location: Gaithersburg Md

iTrader: (1)

Garage List
2008 BMW 335i  [4.50]
Awesome, thanks for the advice, it's never had a carbon cleaning or anything I don't think. It's got about 67k on it. I will try getting the dealer to replace the injectors, isn't there a factory recall or something? Maybe it is the coil pack(s)
Appreciate 0
      11-03-2012, 10:32 AM   #5
ramspeed
Private First Class
ramspeed's Avatar
1
Rep
143
Posts

 
Drives: 2008 E92 335i
Join Date: Sep 2012
Location: Gaithersburg Md

iTrader: (1)

Garage List
2008 BMW 335i  [4.50]
Quote:
Originally Posted by joec500
leaking injector causing a super rich startup condition. Find out which cylinders are mis-firing, replace those injectors. They can be found for 100-150 online for new ones + 8-10 dollars for decoupling units. Then find someone who can help you to code them. There is a great DIY somewhere on the forums.
So if I see that cylinders 1 and 3 are misfiring, is it safe to assume that those are the injectors I need to replace? Also, could it be the coil packs?
Appreciate 0
      11-03-2012, 02:31 PM   #6
CHECKERED
ex deus machina
CHECKERED's Avatar
United_States
7
Rep
420
Posts

 
Drives: 335i E92, 05 Audi S4
Join Date: Oct 2012
Location: a Treacherous Canyon Road in SoCal

iTrader: (5)

Garage List
2005 Audi S4  [0.00]
Before replacing try swapping coils or injectors to a different cylinder and see if the problem moves to that cylinder
__________________
Garage Queen: 2005 Audi S4 4.2L V8, Vortech Supercharger, Vented CF Hood, PSS9 Coilovers, Sway-bars, RS4 brakes, Fast Intentions - Cat-less Downpipes & Full Exhaust, 505AWTQ
Daily Driver: E92 335i N54: JB4 G5 ISO28 w/BMS Flash, quaife LSD, BMS Meth, AA sport IC, BMS Charge Pipe, BMS OCC, Euro Light Switch, M-Sport Kit, Z4 35is Front Rotors, Hawk HPS pads, SS brake lines; 12.1@117mph (stock intake stock exhaust, 225ís RFT)
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 11:13 PM.




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