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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-02-2007, 06:43 PM   #1
hx288
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Cylinder 4 - missfire

The check engine soonwarning message came on, so I took my car to the shop for a code read. The code said "Cylinder #4 - missfire".
What does that means and how to fix it? Any help would be appreciated!

The mechanic told me that it would cost $200 to fix this, but I just want to see if I could fix it myself.
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Old 03-02-2007, 07:49 PM   #2
325myAZ
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Did the mechanic mention what he'd be doing to correct the problem? Replacing the coil etc.

Ultimately it comes down to whether the mechanic really KNOWs what component is causing the issue. Until he tells you what he's going to do to fix the problem, we can't really determine if it's something that you can fix or not.

IF it's the coil, it's a very easy fix. A single coil will run you around $60 and a new spark plug connector boot will add around $10.
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Old 03-02-2007, 10:23 PM   #3
hx288
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You are right on. The mechanic said that the coil need to be replaced. Please provide instruction for this fix. Thanks for your response!
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Old 03-03-2007, 11:46 AM   #4
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You're in luck if that's all it is!

You can buy a replacement coil and connector boot from www.autohausaz.com for around $57 plus shipping. These guys are very quick to get your order on the way. If you order in the morning, it usually ships that afternoon... they're great!

Here's the DIY. It's for replacing spark plugs, but you have to remove the coils first... so all you need to do is pay attention to the coil removal procedure. It'll probably take you under 30 minutes to do it. And you'll save $150!

http://e46fanatics.com/howto/howtode...hp?howto_id=44
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Old 03-03-2007, 12:29 PM   #5
hx288
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325myaz,
Which is the #4 coil? I just want to make sure I replace the right one.
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Old 03-03-2007, 05:52 PM   #6
325myAZ
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Here's how to figure that:

passenger . . . . . driver

. .. ... . .. 6
. .. ... . .. 5
. .. ... . .. 4
. .. ... . .. 3
. .. ... . .. 2
. .. ... . .. 1

- -- -- Front of Car
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Old 03-03-2007, 07:21 PM   #7
hx288
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325myAZ,
Thank very much for your help. This forum is great! I ordered the parts and will do the repair myself.
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Old 03-04-2007, 12:38 PM   #8
330 HRE
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How many miles do you have on your coils? There is a recall on these coils and they are good for 80k, the warranty that is. Call up your dealer and see if they will replace it for you under the coil recall. Doesn't matter if you have the Bemi or Bosche ones. This is a common problem. The second thing is, it can be your spark plugs misfired being not being ever changed.
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Old 03-04-2007, 06:11 PM   #9
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The recall only covers bremi coils, and they replace them wether they fail or not.
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Old 03-06-2007, 05:24 PM   #10
hx288
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I checked with the local dealer and they told me that there was no recall on my car.
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Old 03-07-2007, 12:12 AM   #11
325myAZ
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In which case, you have Bosch coils, and the number 4 has failed. (Or at least that's what your mechanic has told you.)

Depending upon how many miles you have on the engine, you might want to consider replacing the spark plugs while you've got the cover removed...
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Old 03-07-2007, 02:38 AM   #12
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Swap the coils to make sure it is a coil problem and not another problem
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Old 03-07-2007, 12:56 PM   #13
hx288
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Thanks for all the tips guys. I ordered the coil and connector, and they are scheduled to come tomorrow. Will get back and let you know how it goes.
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Old 03-09-2007, 06:12 PM   #14
hx288
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My parts came today. I changed the coil and that took care of the problem. Thanks for all your help.
My car has close to 74000 miles on it. Is it time for me to replace the spark plugs?
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Old 03-09-2007, 06:20 PM   #15
330 HRE
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If you never changed them before, then I would change them out. Supposely they are good for 100k, but I usually change them out roughly about every 30k or so.
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Old 03-12-2007, 12:14 PM   #16
hx288
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330 HRE,
What brand of Spark plugs should I use?
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Old 03-12-2007, 10:26 PM   #17
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OEM is a good plug and shockingly cheap, dont fall for hype, there is no gain in any other plug
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