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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jan-24-2012, 09:06:56 AM   #11
///M_Achilles
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Default Re: Coil Packs - Maint. Items?

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Originally Posted by nis350 View Post
Thanks....

Do you recommend replacing all 6 if one or two failed? Any idea which brand came with the 04 model?
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Originally Posted by kaiv View Post
You do not need to replace the coil packs if they haven't failed.A failed coil pack will throw a misfire code.

If you have to replace them buy Bosch or Bremi. Do NOT get the Hamburg Technic ones.
Knowing me, however, I'd replace all coil packs and plugs while I'm there; peace of mind
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Old Tue, Jan-24-2012, 08:53:48 PM   #12
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Default Re: Coil Packs - Maint. Items?

In my opinion it isn't smart to replace all coil packs. I've seen replacement parts fail before other original parts. If it works leave it alone. If your coil fails basically you are running on 5 cylinders and the unburned fuel will trigger a lean code.

85k miles 03.5 all original coils.
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Old Tue, Jan-24-2012, 10:55:08 PM   #13
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Default Re: Coil Packs - Maint. Items?

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Originally Posted by 5ABIVT View Post
In my opinion it isn't smart to replace all coil packs. I've seen replacement parts fail before other original parts. If it works leave it alone. If your coil fails basically you are running on 5 cylinders and the unburned fuel will trigger a lean code.

85k miles 03.5 all original coils.
I agree. A new one is just as likely to fail (do to a manufacturing defect), as an old one is from age.
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Old Wed, Jan-25-2012, 01:25:29 AM   #14
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Default Re: Coil Packs - Maint. Items?

A little off topic but my cheap buddy has an 02 RSX and he failed to change his coil packs after I told him multiple times that they need to be changed. I had found all four of them in really bad shape with 100K on all four. They were starting to look a little chard. He was getting an error and check engine light but still failed to change them.

After stalling at a stop light, I rescued him and found a severely damaged coil pack on cylinder one. The entire coil pack and spark plug had melted away from arching.

The worse of it was the threads on the cylinder head had melted away too and he then needed to replace the cylinder head.

Moral of the story, never continue to use a failed or damaged coil pack. Replace them if they no longer operate or throw a CEL.
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Old Wed, Jan-25-2012, 03:27:06 AM   #15
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Default Re: Coil Packs - Maint. Items?

I got the SES light a few weeks ago and sure enough, misfire on a few cylinders. I replaced all 6 coil packs and plugs.
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Old Wed, Jan-25-2012, 04:26:10 AM   #16
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Default Re: Coil Packs - Maint. Items?

Oxygen Sensors are more of maint. item more than your coil packs. There are lots of ways to test your coil packs..aka. current ramping them and such. Doing a good visual inspecion is always not a bad idea during your services
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Old Wed, Jan-25-2012, 07:13:34 AM   #17
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Default Re: Coil Packs - Maint. Items?

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Originally Posted by YGOSLO03 View Post
I got the SES light a few weeks ago and sure enough, misfire on a few cylinders. I replaced all 6 coil packs and plugs.
Did you at least check which ones were bad ?
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Old Wed, Jan-25-2012, 09:46:17 AM   #18
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Default Re: Coil Packs - Maint. Items?

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Originally Posted by nis350 View Post
Thanks....

Do you recommend replacing all 6 if one or two failed? Any idea which brand came with the 04 model?
It's up to you IMHO. One failed on my ex-E46 and I just replaced that single one. The others never gave me any problems, even after many many miles. On the other hand I do know of cars which had a couple more fail soon after the first one.
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Old Sun, Jan-29-2012, 12:26:55 AM   #19
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Default Re: Coil Packs - Maint. Items?

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Did you at least check which ones were bad ?
I believe it was cylinders 3 & 4. But I just replaced them all. Preventive maintenance. I didn't wanna have two more go out on me in another 2-3 months or whatever.
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Old Mon, Jan-30-2012, 03:54:42 AM   #20
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Default Re: Coil Packs - Maint. Items?

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Originally Posted by tkelsb View Post
Unless it throws a code they are not wear items...
Thanks all for the info... I also read somewhere that the coil itself is a fairly simple designed item and usually doesn't break under normal operating environment unless expose to excessive heat or just defective.
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Discussing Coil Packs - Maint. Items? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)