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BMW 3-Series (E90 E92) Forum
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Changing the spark plugs, change the coils too?
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| 06-04-2014, 11:25 AM | #1 |
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Colonel
 
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Changing the spark plugs, change the coils too?
I'm going to be changing the plugs soon and was wondering if I should change the coils at the same time. I bought the car used with 78K on it and have no clue if the coils have ever been changed. However I am not getting any misfires. Are misfires the only sign they might need to be replaced? Sure it's easy to swap the coils when changing the plugs, but I don't want to spend $170 to replace the coils if it's not necessary.
Thanks.
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2013 135is DCT Carbon Black Metallic |
| 06-04-2014, 01:37 PM | #2 | |
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Curmudgeon and Pedant
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Quote:
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| 06-04-2014, 02:01 PM | #4 | |
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Brigadier General
 
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Drives: E92 325i MSport Coupe
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You're looking at something like $150 in parts alone for new coils - why would you..?
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| 06-05-2014, 07:38 AM | #6 |
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First Lieutenant
 
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Agree with everyone above. Just replace them as needed.
Some people replace them all when one goes for piece of mind, but I don't feel that one going bad is necessarily a sign that the others will go bad soon. |
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| 06-05-2014, 08:09 AM | #7 |
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Major
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Drives: 2009 BMW 335xi
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I preemptively bought 2 coils so I wouldn't have to wait around if I did have a coil go bad. That being said I have only had one coil go bad across 50k miles and two different 335's.
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| 06-05-2014, 03:09 PM | #8 |
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Colonel
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Agree with everyone. Also, buy a peake research tool, if a code is thrown or the car is running rough it will tell you the exact coil that is misfiring.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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