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Old 02-24-2018, 06:30 PM
TheWeej TheWeej is offline
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Mein Auto: '11 BMW E92 335xi
Cracked ignition coils. Use or not to use?

I got some BOSCH ignition coils from a 328xi that intend to put on my N55 335xi. 2006-2012 coils i've heard are interchangeable and I will replace all of my coils with new ones. These coils were used for about 45K and they looked pretty clean. However 2 of 6 coils have these cracks on them and it seems like a no brainer answer to get a new one.

Would these cracks be considered a big hazard? Should I let them go? I haven't tested them yet but I want to know if pitting/cracking like this is a big red flag.

Dealership quoting 1k for a coil and plug replacement for all of them, I've got new sparks on the way and decided to pick up a buddy's coils and I will just do them myself.

Thanks

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  #2  
Old 02-24-2018, 06:53 PM
Yukoner Yukoner is offline
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Mein Auto: 2011 328i x-drive
Why not just buy new coils ? You can get them pretty cheap:

http://www.rockauto.com/en/catalog/b...tion+coil,7060
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Old 02-24-2018, 06:57 PM
gbalthrop gbalthrop is online now
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Mein Auto: 2007 328xi E91
Quote:
Originally Posted by TheWeej View Post
I got some BOSCH ignition coils from a 328xi that intend to put on my N55 335xi. 2006-2012 coils i've heard are interchangeable and I will replace all of my coils with new ones. These coils were used for about 45K and they looked pretty clean. However 2 of 6 coils have these cracks on them and it seems like a no brainer answer to get a new one.
Definitely DIY @ $25 per coil & $10 per plug

I was surprised to find that your 2011 N55 DOES have the same Bosch coils specified as my 2007 N52KP:
https://www.autohausaz.com/pn/0221504470

I had a similar chunk of rubber missing on one of my coils when I changed the plugs, and replaced that coil "just to be safe." I had a Bosch coil of the same part# so figured I would just use it -- OK to mix old & new if same part#. Just do NOT use Bosch & Delphi, mix & UNmatch.

THAT coil was NOT causing a misfire code on mine, so maybe not something to be worried about. You might be safe just to wrap that part of the coil/ plug boot where the insulation is missing with electrical tape (if high-temp tape). Just a matter of how much you want to pay for peace-of-mind & not having to redo the job in a year or so.

George
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Old 02-24-2018, 07:36 PM
TheWeej TheWeej is offline
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Location: Vancouver, Canada
 
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Mein Auto: '11 BMW E92 335xi
Thanks for the feedback and replies. Yeah DIY all the way.. pelican parts guides are great.

$10 bucks a coil is good but I was hoping to get away with these free hand me downs. Better safe than sorry.

And yeah I was trying to find out the main difference between these coils. Seems like the N55 ones have this metallic outer part as opposed to these rubber ones. How much of a difference does that make?

Thanks again though!
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  #5  
Old 02-25-2018, 07:14 AM
CALWATERBOY DUE CALWATERBOY DUE is offline
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Location: Fog City, California
 
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Mein Auto: 09 E93 335i somewhat mod
Quote:
Originally Posted by TheWeej View Post
I got some BOSCH ignition coils from a 328xi that intend to put on my N55 335xi. 2006-2012 coils i've heard are interchangeable and I will replace all of my coils with new ones. These coils were used for about 45K and they looked pretty clean. However 2 of 6 coils have these cracks on them and it seems like a no brainer answer to get a new one.

Would these cracks be considered a big hazard? Should I let them go? I haven't tested them yet but I want to know if pitting/cracking like this is a big red flag.

Dealership quoting 1k for a coil and plug replacement for all of them, I've got new sparks on the way and decided to pick up a buddy's coils and I will just do them myself.

Yep.

You're smart to buy virgin coils! It's a BMW so money's no object.


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bosch, coil replacement, delphi, engine, ignition coils, n54, n55, oem, plugs replacement, spark plugs, turbo


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