Misfire help

e_nice1803 · 02-26-2016, 09:16 AM

Hey guys I recently helped my friend out with his car 2009 335xi car has 86k. He had a misfire on cylinder 3,6 (p0303,p0306 codes). We decided to replace all spark plugs and replace 2 new coil to cylinder 3 and 6. After that no problem, but this morning he txt me and said the problem has occur again. When he started his car early morning which is cold around 6am he said same codes came up. Can someone please help us out any suggestion???

LangJai · 02-26-2016, 09:18 AM

Is he having rough idle at cold starts? When the car is warm it drives normal?

e_nice1803 · 02-26-2016, 09:26 AM

Yes rough idle when he starts it up and when it warms up its fine

=C= · 02-26-2016, 07:23 PM

de ja vu ?

http://www.e90post.com/forums/showthread.php?t=1230554

Blackbird · 03-03-2016, 12:32 AM

I'm also getting a P0303 cylinder misfire code on my '07 335i. It started when I dropped down a couple of gears (AT) to pass a couple slowpokes on the freeway. The SES light popped on, but nothing felt wrong about the way the car was running. Reset the code to see if it would come back. The next night I ran the car hard again and got the SES light (same code) AND the engine started running very roughly under load (though fine at idle). Shut the car down, restarted, and the roughness and SES light were gone.

Until I get time to troubleshoot this I'm running the car very gently. Had no issues with it today.

Found this E39 diagnostic thread (http://www.bimmerfest.com/forums/sho...d.php?t=500419) that I'll use as far as I can. That probably means checking coolant color, swapping coils, checking plug seating, fuel injector cleaning, and cleaning the MAF. Anything beyond that is more than I can tackle.

The challenge is inducing the issue again. Presumably running the car hard will cause it, but I don't want to be too far from home when I do.

BSM n54iS · 03-03-2016, 01:21 AM

Look above at all the sticky threads ^^^^^^^ The answers gotta be in here somewhere
http://www.e90post.com/forums/showthread.php?t=631829

bloppitybloop · 03-03-2016, 08:48 AM

Please, make more threads asking the same question which has already been answered.

Dominasian335 · 03-03-2016, 12:08 PM

if you are running increased boost, make sure you step your plugs and gap them properly for boost you are running. Don't buy cheap coils as they don't hold enough power and misfire. NGK plugs and Bosch coils if you are tuned, everything else will give you trouble higher than stage 2

=C= · 03-04-2016, 12:48 AM

New Bosch plugs should already be gapped...

Mike@N54Tuning.com · 03-04-2016, 10:31 AM

Quote:

Originally Posted by =C=

New Bosch plugs should already be gapped...

+1

Only the NGK plugs need to be gapped.

Mike

02-26-2016, 09:16 AM	#1
e_nice1803 New Member 10 Rep 9 Posts Drives: 09 335i xdrive Join Date: May 2012 Location: NJ iTrader: (0)	Misfire help Hey guys I recently helped my friend out with his car 2009 335xi car has 86k. He had a misfire on cylinder 3,6 (p0303,p0306 codes). We decided to replace all spark plugs and replace 2 new coil to cylinder 3 and 6. After that no problem, but this morning he txt me and said the problem has occur again. When he started his car early morning which is cold around 6am he said same codes came up. Can someone please help us out any suggestion???
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02-26-2016, 09:18 AM	#2
LangJai Private First Class 26 Rep 190 Posts Drives: 335i RWD 6MT Join Date: Feb 2015 Location: GTA/KW iTrader: (0)	Is he having rough idle at cold starts? When the car is warm it drives normal? __________________ 2009 BMW 335i \| RWD \| 6MT \| M Sport \| BMW PE \| BMS DCI \| Bilstein PSS9 \| ER CP+TiAL BOV Coded: Digital Speedo, Disable nav disclaimer, Auto folding mirrors when lock/unlock, Amber corner lights delete
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02-26-2016, 09:26 AM	#3
e_nice1803 New Member 10 Rep 9 Posts Drives: 09 335i xdrive Join Date: May 2012 Location: NJ iTrader: (0)	Yes rough idle when he starts it up and when it warms up its fine
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02-26-2016, 07:23 PM	#4
=C= First Lieutenant 73 Rep 311 Posts Drives: 2007 BMW 335i M-Sport E90 Join Date: Jul 2012 Location: land of the long white cloud iTrader: (0)	de ja vu ? http://www.e90post.com/forums/showthread.php?t=1230554
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03-03-2016, 12:32 AM	#5
Blackbird Private 2 Rep 58 Posts Drives: 2007 E90 Graphite Metallic Join Date: Dec 2009 Location: near Seattle, WA iTrader: (2) Garage List 2007 E90 [0.00]	I'm also getting a P0303 cylinder misfire code on my '07 335i. It started when I dropped down a couple of gears (AT) to pass a couple slowpokes on the freeway. The SES light popped on, but nothing felt wrong about the way the car was running. Reset the code to see if it would come back. The next night I ran the car hard again and got the SES light (same code) AND the engine started running very roughly under load (though fine at idle). Shut the car down, restarted, and the roughness and SES light were gone. Until I get time to troubleshoot this I'm running the car very gently. Had no issues with it today. Found this E39 diagnostic thread (http://www.bimmerfest.com/forums/sho...d.php?t=500419) that I'll use as far as I can. That probably means checking coolant color, swapping coils, checking plug seating, fuel injector cleaning, and cleaning the MAF. Anything beyond that is more than I can tackle. The challenge is inducing the issue again. Presumably running the car hard will cause it, but I don't want to be too far from home when I do. __________________ '07 Graphite E90 \| SSTT v.1 \| Sprint Booster \| Blacklines \| PIAA Halos
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03-03-2016, 01:21 AM	#6
BSM n54iS Brigadier General 2683 Rep 4,203 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	Look above at all the sticky threads ^^^^^^^ The answers gotta be in here somewhere http://www.e90post.com/forums/showthread.php?t=631829 __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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03-03-2016, 08:48 AM	#7
bloppitybloop Major 397 Rep 1,371 Posts Drives: 2007 335i Join Date: Mar 2014 Location: Wisconsin iTrader: (1)	Please, make more threads asking the same question which has already been answered.
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03-03-2016, 12:08 PM	#8
Dominasian335 Private First Class 8 Rep 97 Posts Drives: 2007 BMW 335xi Join Date: May 2015 Location: Aurora, Colorado iTrader: (0)	if you are running increased boost, make sure you step your plugs and gap them properly for boost you are running. Don't buy cheap coils as they don't hold enough power and misfire. NGK plugs and Bosch coils if you are tuned, everything else will give you trouble higher than stage 2
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03-04-2016, 12:48 AM	#9
=C= First Lieutenant 73 Rep 311 Posts Drives: 2007 BMW 335i M-Sport E90 Join Date: Jul 2012 Location: land of the long white cloud iTrader: (0)	New Bosch plugs should already be gapped...
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