Limp Mode, Misfire, Engine Symbol, P312e

Real Nice Guy · 06-04-2015, 12:56 PM

Hopefully somebody can help me out...

Yesterday I installed cat-less downpipes with no problems, went for a drive and everything was good. Later that night went out again and while WOT there was a few small stutters, then it got worse to where the car went into limp mode while showing the engine symbol on the cluster!
I had no boost and was misfiring so bad the car sounded like a Subaru lol.

Got home and restarted the car and it was acting normal for a little while but then returned to limp mode.

My first impression was I damaged either bank 1 or bank 2 upstream o2 sensor, so I was hoping to see something like 1,2,3 or 4,5,6 misefires and an o2 ground negative codes.... but after using an AutoZone scan tool the only code that I got was a P312e "No DTC definition found"??

Previous to the downpipes and this problem I did have a SES light on for P2402 "Evap system leak detection pump control circuit high"
I figure the car needs a new DMTL pump

It starts right away with no hesitation.

2007 with 57K miles
I no longer have any warranty for wastegate rattle, fuel injectors, HPFP or anything?

335NJ · 06-04-2015, 02:08 PM

http://www.e90post.com/forums/showthread.php?t=783934

Google that code- P312E BMW

Real Nice Guy · 06-04-2015, 02:15 PM

I already saw that thread before posting...
He eventually got 2 codes that were actually helpful and replaced a single injector.

Real Nice Guy · 06-04-2015, 10:50 PM

Welp I drove the car some more to see if I could get any additional codes out and a cylinder 5 misfire came up.

This problem is intermittent, Weirdly enough the car randomly ran normal for a short period of time and had no problems doing WOT but then returned to LIMP mode the next time I started it??? No rhym or reason to it.

335NJ · 06-04-2015, 11:17 PM

Quote:

Originally Posted by Real Nice Guy

Welp I drove the car some more to see if I could get any additional codes out and a cylinder 5 misfire came up.

This problem is intermittent, Weirdly enough the car randomly ran normal for a short period of time and had no problems doing WOT but then returned to LIMP mode the next time I started it??? No rhym or reason to it.

How long did it sit before the cold start? Maybe a leaky injector.

Real Nice Guy · 06-04-2015, 11:29 PM

Quote:

Originally Posted by 335NJ

How long did it sit before the cold start? Maybe a leaky injector.

It sat overnight and still had limp in the morning, drove it to autozone to scan.
Got #5 misfire
Cleared the codes
Started to run better and was able to go WOT with no SES light for a small period of time.
Turned off the car for a few hours
Came back to misfires worse then ever and limp mode.

335NJ · 06-04-2015, 11:50 PM

So if cylinder 5 only seems to miss after sitting for awhile, I'd think the injector is leaking. When you fire it up, that cylinder is chock full of fuel and misfires.

You can start by doing the normal misfire diagnoses, and replacing the plugs, but I'm leaning towards an injector here.

Pull the plug in cylinder 5 and see if it looks like it's fouled, or a different color than the rest.

Real Nice Guy · 06-07-2015, 01:34 PM

Welp got some more codes

P0306 - Cylinder 6 Misfire
P0206 - Cylinder 6 Injector Open Circuit

The number on them is 1353 7537317 - 10

Browsing online I found something that said any prefix 10 or below you have to replace all 6 at once?
Prefix 11 or above you can replace a single injector....

Build date was 09/06

06-04-2015, 12:56 PM	#1
Real Nice Guy . 31 Rep 370 Posts Drives: 2008 e90 M3 Join Date: Nov 2013 Location: NJ iTrader: (4)	Limp Mode, Misfire, Engine Symbol, P312e Hopefully somebody can help me out... Yesterday I installed cat-less downpipes with no problems, went for a drive and everything was good. Later that night went out again and while WOT there was a few small stutters, then it got worse to where the car went into limp mode while showing the engine symbol on the cluster! I had no boost and was misfiring so bad the car sounded like a Subaru lol. Got home and restarted the car and it was acting normal for a little while but then returned to limp mode. My first impression was I damaged either bank 1 or bank 2 upstream o2 sensor, so I was hoping to see something like 1,2,3 or 4,5,6 misefires and an o2 ground negative codes.... but after using an AutoZone scan tool the only code that I got was a P312e "No DTC definition found"?? Previous to the downpipes and this problem I did have a SES light on for P2402 "Evap system leak detection pump control circuit high" I figure the car needs a new DMTL pump It starts right away with no hesitation. 2007 with 57K miles I no longer have any warranty for wastegate rattle, fuel injectors, HPFP or anything?
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06-04-2015, 02:08 PM	#2
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	http://www.e90post.com/forums/showthread.php?t=783934 Google that code- P312E BMW
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06-04-2015, 02:15 PM	#3
Real Nice Guy . 31 Rep 370 Posts Drives: 2008 e90 M3 Join Date: Nov 2013 Location: NJ iTrader: (4)	I already saw that thread before posting... He eventually got 2 codes that were actually helpful and replaced a single injector.
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06-04-2015, 10:50 PM	#4
Real Nice Guy . 31 Rep 370 Posts Drives: 2008 e90 M3 Join Date: Nov 2013 Location: NJ iTrader: (4)	Welp I drove the car some more to see if I could get any additional codes out and a cylinder 5 misfire came up. This problem is intermittent, Weirdly enough the car randomly ran normal for a short period of time and had no problems doing WOT but then returned to LIMP mode the next time I started it??? No rhym or reason to it.
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06-04-2015, 11:50 PM	#7
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	So if cylinder 5 only seems to miss after sitting for awhile, I'd think the injector is leaking. When you fire it up, that cylinder is chock full of fuel and misfires. You can start by doing the normal misfire diagnoses, and replacing the plugs, but I'm leaning towards an injector here. Pull the plug in cylinder 5 and see if it looks like it's fouled, or a different color than the rest. Last edited by 335NJ; 06-05-2015 at 08:46 AM..
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06-07-2015, 01:34 PM	#8
Real Nice Guy . 31 Rep 370 Posts Drives: 2008 e90 M3 Join Date: Nov 2013 Location: NJ iTrader: (4)	Welp got some more codes P0306 - Cylinder 6 Misfire P0206 - Cylinder 6 Injector Open Circuit The number on them is 1353 7537317 - 10 Browsing online I found something that said any prefix 10 or below you have to replace all 6 at once? Prefix 11 or above you can replace a single injector.... Build date was 09/06 Last edited by Real Nice Guy; 06-07-2015 at 02:12 PM..
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