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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 04-18-2013, 11:44 AM   #1
E46BAV91
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2003 325XI 4th cylinder misfire

Hello all. I have been having some troubles with my car but nothing serious has happened until yesterday. It wouldn't turn on until the third time I tried it and that is when the check engine light came on. It has stayed on and the car shakes during idle. I am a total newbie to fixing my own car and I have an at home diagnostic tool. I used it and this code came up: P1349. Research says it is the fourth cylinder misfiring and it might either be the spark plug or the coil. I just had all spark plugs replaced so process of elimination says it should be the coil right? Is that hard to replace? I don't want to pay shop fees and labor so if I can do it myself I would rather do that. Where should I buy parts? Does anyone have any advice? I would greatly appreciate it
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Old 04-18-2013, 12:07 PM   #2
redbull 325is
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swap coil #4 with coil #1 see if the fault moves with the coil. should take you 15 minutes tops.
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Old 04-18-2013, 12:14 PM   #3
E46BAV91
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What do I do if it changes with the coil? That would just be a way to verify that it is the coil right? Is it generally safe to do this on my own? I will have help from a more experienced DIYer but I want to be sure.
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Old 04-18-2013, 12:29 PM   #4
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I got this same code the other day when I started my car for the first time in 12 weeks. It was running very rough. I shut it off and restarted and the problem went away.

Yes, if the problem follows the coil then it's that coil. Very easy to replace.
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Old 04-18-2013, 12:35 PM   #5
E46BAV91
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It used to go away if I turned the car off then on but that was before the check engine light came on with it. I will definitely be doing that. Is it urgent? I won't have time to do anything until Saturday or Sunday, but I don't want to just take it I the mechanic if I can do it myself.
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Old 04-18-2013, 12:40 PM   #6
E46BAV91
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Sorry for all the questions. I am far from experienced with cars and was thrilled just to change my own oil :p. I really appreciate the help!
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Old 04-18-2013, 01:46 PM   #7
e46alfonso
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Did you use ngk or bosch plugs? Some people have had problems with bosch in the past.

Another thing it could be is a loose spark plug, it does happen.
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Old 04-18-2013, 02:09 PM   #8
E46BAV91
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I have no clue what kind they are but I will definitely have to check into that.
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Old 04-18-2013, 02:13 PM   #9
Big Rick
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Swap the coils... It is VERY easy to do. If the problem moves with the coil just buy a new one to replace it. These are VERY easy to swap and replace.

I had the same issue... I bought an extra coil and it is sitting in my shop just in case another fails.
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Old 04-18-2013, 02:21 PM   #10
E46BAV91
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Here is another question. My fiancÚ thinks it could possibly be a leak in a hose or the air intake boot. Thoughts? I don't think he is right on this one, but he knows more than I do.
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Old 04-18-2013, 02:35 PM   #11
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Quote:
Originally Posted by E46BAV91 View Post
Here is another question. My fiancÚ thinks it could possibly be a leak in a hose or the air intake boot. Thoughts? I don't think he is right on this one, but he knows more than I do.
That could possibly be adding to some of your issues but the code said says coil, yes? Start there and move on to the rest.

But the intake boot is another failure prone area over time.
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Old 04-18-2013, 02:40 PM   #12
E46BAV91
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The code only says that cylinder 4 is misfiring. When I did some further research I came up with it being either the coil or the spark plug and am assuming it is the coil because we replaced all the spark plugs two months ago when this first started. There was no code that pulled up when we had that done.
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Old 04-18-2013, 02:51 PM   #13
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It's going to be your coil... $50 or so as I recall...
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Old 04-18-2013, 02:54 PM   #14
E46BAV91
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That's not so bad at all. Any advice for a novice mechanic? I haven't done this before and I don't think my fiancÚ has either.
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Old 04-18-2013, 03:12 PM   #15
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Sure... There are a TON of DIY stuff on this website on how to do it with LOTS of pictures. You'll need some basic hand tools but nothing expensive. You most likely already have the stuff you need.

I could probably do it now in about 15 minutes from start to finish... So allow yourself a leisurely hour or so. Already have a coil ready to install. So if you even do the switch of coils... You have a replacement. Not a hassle to get it all back apart I guess but still... Just do it the first time.

THIS is a link to do the coils on an M3... Not the same exactly... But very similar...
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Old 04-18-2013, 03:15 PM   #16
E46BAV91
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Thank you so much!!
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Old 04-18-2013, 03:18 PM   #17
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No sweat... It is an easy DIY!
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Old 04-18-2013, 03:21 PM   #18
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this thread is making me think of



get the tool box out and start wrenchin' yo
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Old 04-18-2013, 03:49 PM   #19
E46BAV91
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I promise I'm not that dumb
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Old 04-18-2013, 03:54 PM   #20
e46alfonso
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bosch coils are only $25 each.

Tell the fiance to take a picture of you while replacing the coil and post it here.
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