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DIY: Do It Yourself
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Old 01-09-2012, 08:32 AM   #1
phug
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Ignition Coil Gray Deposits

I wanted to post these pics of my coils. I have a 2000 323i wagon with 99000 mi. I took these as I was about to replace my plugs for preventative maintenance with NGK Iridium plugs. However, once I saw these markings on the outside of the coil I stopped. A $45 preventative weekend parts swap has turned into a $300+ one.

I read in another post of these ash gray deposits on the coils which point to possible or eventual issues down the road with misfires caused by internal arching (thx stickbuilder). As you can see I have visible on ALL of the coils. Lucky me. I'd like to understand this in more detail.

I don't have any obvious issues with engine performance or misfires that are noticeable without a automotive reader. But I will plan on replacing my Bremi coils with the same ones in the coming weeks now because I'm have to fix it now that I know its there.
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Last edited by phug; 01-09-2012 at 08:19 PM.
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Old 01-09-2012, 04:12 PM   #2
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Can you point at which deposit?

Is it on the bolt facing upwards or the rust colour on the coilpack itself?
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Old 01-09-2012, 08:21 PM   #3
phug
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NP. I just uploaded additional images pinpointing the ash gray deposits on the coils.

BTW - The upward facing bolt it for the valve cover nut. That has like a calcified and rust buildup I think is most likely from previous owners engine pressure washes.

Last edited by phug; 01-09-2012 at 08:25 PM.
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Old 01-10-2012, 08:24 AM   #4
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Coils are expensive. I would wait till there is a misfire before I change mines.

I haven't had to replace a coil yet and I'm at 270k kms, knock on wood.

Thanks for the insight tho
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Old 01-10-2012, 08:55 AM   #5
phug
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Quote:
Originally Posted by RockerGuy View Post
Coils are expensive. I would wait till there is a misfire before I change mines.

I haven't had to replace a coil yet and I'm at 270k kms, knock on wood.

Thanks for the insight tho
NP. I have a problem with knowing these coils are either bad or going bad and not replacing them. I know some would not replace till there's a failure however, I figure its preventative and easy to replace.

Anyone experienced this ash gray residue on their coils when troubleshooting an ignition issue?
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Old 01-10-2012, 09:40 AM   #6
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Try auto zone. They charge about $35/coil for my car (MS45) and they are Bosch coils in an auto zone box. Not sure how different early E46s are.
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Old 01-10-2012, 01:44 PM   #7
phug
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Originally Posted by bigjae1976 View Post
Try auto zone. They charge about $35/coil for my car (MS45) and they are Bosch coils in an auto zone box. Not sure how different early E46s are.
Thanks for the suggestion. I looked there earlier and could only find these from Duralast. They look to be junk Chinese copies of OEM brands.

http://www.autozone.com/autozone/par...er=263933_0_0_

I'm going with the OEM Bremi from FCPEuro I think. Thx anyway.
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Old 01-10-2012, 03:46 PM   #8
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I'd pass then...I got a Bosch coil from Auto Zone.

I know that the Bremi's had issues with the coils made for my car. Bosch might be a more reliable alternative...something to consider.
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Old 01-10-2012, 07:13 PM   #9
phug
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Bremi issue was back several years back from what I've read. I think they ate back in good graced with BMW as they are OEM suppliers along with Bosch. I would not trust any other brand.
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