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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Replacing coils, do I need to replace plugs since they were just replaced?



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      08-23-2016, 02:09 PM   #1
jeffdubya
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Replacing coils, do I need to replace plugs since they were just replaced?

I'm getting misfires in cylinders 1 & 3, and I know it's not the plugs because I just had all the plugs replaced a few weeks ago.

So I'm going to replace the coils in those cylinders. I have heard that a bad coil can cause a plug to go bad as well. So, do I need to replace those two plugs as well, even though they are only a few weeks old? I realize plugs are cheap so it wouldn't be super expensive to just go ahead and replace them, but I hate to be wasteful.
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      08-23-2016, 05:56 PM   #2
madmantwo
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Quote:
Originally Posted by jeffdubya View Post
I'm getting misfires in cylinders 1 & 3, and I know it's not the plugs because I just had all the plugs replaced a few weeks ago.

So I'm going to replace the coils in those cylinders. I have heard that a bad coil can cause a plug to go bad as well. So, do I need to replace those two plugs as well, even though they are only a few weeks old? I realize plugs are cheap so it wouldn't be super expensive to just go ahead and replace them, but I hate to be wasteful.
Nope, replace the coils and your plugs should still be fine. If you are still getting misfires after that, it might be leaky injectors causing the problem
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      08-24-2016, 12:31 PM   #3
jeffdubya
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Did it.

Quote:
Originally Posted by madmantwo View Post
Nope, replace the coils and your plugs should still be fine. If you are still getting misfires after that, it might be leaky injectors causing the problem
Runs beautifully. No fault codes. Thanks for the tip.
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