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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52 CEL Code Help!



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      03-20-2013, 08:20 PM   #1
Hybrid For Life
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N52 CEL Code Help!

Started my car at work today to get lunch and immediately notice shaking/vibrating from the engine along with a varying idle speed from about 500-800rpm. Drove car for a bit to see if it would clear out what seemed to be a missfire. Car sounded terrible and had very little power, shaking/misfire happening at all rpm ranges. Finally on the way back to work CEL light came on, after work I read the code with a code reader and heres what I got: P0304 Cylinder 4 Misfire Detected


I'm guessing its is directly related to me needing new plugs/coils as I'm still on the original set with over 112,000 miles. I plan on doing plugs first, what else could be causing this. Searched around a didn't find much specific to n52's

Last edited by Hybrid For Life; 03-21-2013 at 12:44 PM.
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      03-21-2013, 07:35 AM   #2
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At 112k I'd go ahead and change all 6 plugs. Start with that since it's relatively cheap and needs to be done anyway.
It could also be an ignition coil. To see if that is the problem, take the ignition coil from the cylinder that is misfiring and swap it with the one next to it. If the misfire is now in the cylinder that you moved the coil for cyl #4 to, that coil needs to be replaced.
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      03-21-2013, 08:23 AM   #3
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You didnt search because if you did you would immediately find the answer.
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      03-21-2013, 08:34 AM   #4
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Quote:
Originally Posted by Johnny D View Post
You didnt search because if you did you would immediately find the answer.
+1 prob the most common failed part on a n52, guarantee its the ignition coil. I would replace all 6 plugs since you're over 100k and while you have everything opened up I would replace all 6 coils as preventative upkeep some will say to change them as they go out but what a pain in the ass every time just do it all in one shot. There really not that expensive anymore and the rest WILL fail eventually.
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      03-21-2013, 10:15 AM   #5
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Quote:
Originally Posted by benzo23 View Post
+1 prob the most common failed part on a n52, guarantee its the ignition coil. I would replace all 6 plugs since you're over 100k and while you have everything opened up I would replace all 6 coils as preventative upkeep some will say to change them as they go out but what a pain in the ass every time just do it all in one shot. There really not that expensive anymore and the rest WILL fail eventually.
Aren't they still about $50-$60 per coil? Maybe I'm being overly frugal but I'd rather deal with doing them as they go out than drop $400 all at once for plugs and coils... Then again if I didn't have ongoing projects on my car I probably would. Maintenance is paramount though
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      03-21-2013, 10:27 AM   #6
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Ive seen them for less then 50. I just see it as convenient to do everything at once while youre under there. I mean do you want to take all the covers off 6 separate times and have 6 different misfires. If one is going the others aren't far behind. Just wise words of wisdom esp with 112k, Set it and forget it one less thing to worry about.

here is from ecs tuning, dbl check your part numbers this was just a quick search.,

http://www.ecstuning.com/BMW-E90-330....0L/ES1304983/
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      03-21-2013, 12:45 PM   #7
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Thanks guys, I was more wondering what else it would be if it doesnt turn out to be the coil or plugs?
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      03-21-2013, 12:48 PM   #8
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FYI I recently change my plugs at 100k miles and my coils look in good condition. If I were you just replace plugs first and go from there...
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      03-21-2013, 12:54 PM   #9
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FYI I recently change my plugs at 100k miles and my coils look in good condition. If I were you just replace plugs first and go from there...
thats the plan although I'm pretty sure its a coil also, doing plugs first and then seeing if the misfire is still happening, if so then i'll do the coil swap test
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      03-21-2013, 12:59 PM   #10
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thats the plan although I'm pretty sure its a coil also, doing plugs first and then seeing if the misfire is still happening, if so then i'll do the coil swap test
Cool bro... good luck and keep us posted. Cheers!
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      03-23-2013, 07:46 AM   #11
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Quote:
Originally Posted by Hybrid For Life
Thanks guys, I was more wondering what else it would be if it doesnt turn out to be the coil or plugs?
Lifter. Was there loud ticking as well?
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      03-23-2013, 02:33 PM   #12
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Lifter. Was there loud ticking as well?
No, sounds like a misfire not lifter tick
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