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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-27-2014, 10:43 AM   #1
ghyelde
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Join Date: Nov 2014
Location: Texas
Posts: 1
My Ride: 2006 M3
Misfires

2005 ZHP. went through all the hoses in the intake system per a post on this forum. found the leak that was causing major lack of power, etc. started car and while it ran better it was still rough. found one cylinder with a misfire. moved the coil to a couple of different cylinders and the misfire moved with the coil. replaced the coil - yes everything I read says replace all but this does not make sense to me - and while the car runs 90% better, there is still a misfire in a single cylinder. move the offending coil around and the misfire follows it.

am I just unlucky and have a weak coil that shows up sometime, or are the electrics tied together somehow?

thought are appreciated, glenn
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Old 11-28-2014, 08:23 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 5,642
My Ride: 2001 330Ci
Have the codes read. That's always the first step.
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Old 11-28-2014, 09:18 AM   #3
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 21,919
My Ride: 330CiC, M5, X5, E93
You provide no solid data, how do you know the problem is moving with the coil?

You may have multiple problems cause different misfires.

Need OBDII info - Freeze Frame, Fuel Trims @ warm idle and steady cruise.

Codes in PXXXX format.

EXPLAIN when the misfires occur, in detail.

Everything is outlined in the first 2 links below in my signature.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 04-18-2015, 10:29 PM   #4
aleksankazakov
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My Ride: 04 E46 330i sport
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I had soimething as well, I think this is a good tip:
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