Help with misfire

Dcara · 03-13-2015, 07:54 PM

So I started getting some rough idling and misfire code for cylinder 5.
It only seems to be an issue at low RPM's When I gun it it runs great.

Current mods
JB4 ISO5, BMS backend flash, DCI, Chargepipe, downpipes

What I've tried:
1) I just got all new injectors in the fall
2) swapped spark plug
3) swapped coil
4) Fuel Injector Cleaner
5) checked injectors with INPA and they seem fine

I'll attach some logs, and images below, but this is what's throwing me off.
Even though the misfire code I am getting is for Cyl 5 when I connect my phone to JB4 the timing on it is the same as all other cylinders except for #1. When I look at the logs the timing on it bounces around when I'm at idle or low RPM's. When I'm at high RPM's the timing is the same on all cylinders...
I've also swapped the plug and coil on Cylinder 1.

Anyone know what is going on?

Why is it that my check engine light is on, but there is no info on it in iDrive?
In the second pic you can see how off injector 1 readings are, and the other two pics show the graphs from my logs of all 6 cylinders.

I'm completely out of ideas... So frustrating with the good weather just kicking in.

Dcara · 03-13-2015, 08:00 PM

Oh it's an 2007 335I

tampaturbom3 · 03-13-2015, 08:18 PM

Since you swapped plugs, I'll rule out that the gap is off. Just an idea>>>How many miles and when was last walnut blast? mine was at 54k miles and under WOT, big miss. I did the blast and plugs, now it's running great.

924er · 03-13-2015, 08:28 PM

Clean your vanos, those can throw misfires as well.

When was the last time your valve cover gasket was changed ? How did the plug look on cyl 5?

Just because you changed injectors in the fall doesn't mean you ruled out a bad injector. I would swap and code injector again and see if that happens.

Also I would reset adaptations

924er · 03-13-2015, 08:30 PM

Bro idrive doesn't show sqat. Don't worry about that

Dcara · 03-19-2015, 09:54 PM

Thanks for the help!

I figured it out. Turns out one of the injectors I installed in the fall crapped out. Replace it and runs smooth as silk. 83000 km on it never done walnut blasting or valve cover gasket.

03-13-2015, 07:54 PM	#1
Dcara Private First Class 9 Rep 196 Posts Drives: 2012 M5 Join Date: Sep 2012 Location: Edmonton iTrader: (0)	Help with misfire So I started getting some rough idling and misfire code for cylinder 5. It only seems to be an issue at low RPM's When I gun it it runs great. Current mods JB4 ISO5, BMS backend flash, DCI, Chargepipe, downpipes What I've tried: 1) I just got all new injectors in the fall 2) swapped spark plug 3) swapped coil 4) Fuel Injector Cleaner 5) checked injectors with INPA and they seem fine I'll attach some logs, and images below, but this is what's throwing me off. Even though the misfire code I am getting is for Cyl 5 when I connect my phone to JB4 the timing on it is the same as all other cylinders except for #1. When I look at the logs the timing on it bounces around when I'm at idle or low RPM's. When I'm at high RPM's the timing is the same on all cylinders... I've also swapped the plug and coil on Cylinder 1. Anyone know what is going on? Why is it that my check engine light is on, but there is no info on it in iDrive? In the second pic you can see how off injector 1 readings are, and the other two pics show the graphs from my logs of all 6 cylinders. I'm completely out of ideas... So frustrating with the good weather just kicking in. Attached Images
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03-13-2015, 08:00 PM	#2
Dcara Private First Class 9 Rep 196 Posts Drives: 2012 M5 Join Date: Sep 2012 Location: Edmonton iTrader: (0)	Oh it's an 2007 335I
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03-13-2015, 08:18 PM	#3
tampaturbom3 Private First Class 11 Rep 117 Posts Drives: 2013 BMW M6 Coupe Join Date: Mar 2012 Location: Tampa,FL iTrader: (0)	Since you swapped plugs, I'll rule out that the gap is off. Just an idea>>>How many miles and when was last walnut blast? mine was at 54k miles and under WOT, big miss. I did the blast and plugs, now it's running great. __________________ Tommy 2013 M6 Coupe- Tanzanite blue
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03-13-2015, 08:28 PM	#4
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	Clean your vanos, those can throw misfires as well. When was the last time your valve cover gasket was changed ? How did the plug look on cyl 5? Just because you changed injectors in the fall doesn't mean you ruled out a bad injector. I would swap and code injector again and see if that happens. Also I would reset adaptations __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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03-13-2015, 08:30 PM	#5
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	Bro idrive doesn't show sqat. Don't worry about that __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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03-19-2015, 09:54 PM	#6
Dcara Private First Class 9 Rep 196 Posts Drives: 2012 M5 Join Date: Sep 2012 Location: Edmonton iTrader: (0)	Thanks for the help! I figured it out. Turns out one of the injectors I installed in the fall crapped out. Replace it and runs smooth as silk. 83000 km on it never done walnut blasting or valve cover gasket.
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