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Panamera The 4-dour coupe by Porsche

Coils, plugs questions

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Old 08-10-2018, 07:59 PM
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Coils, plugs questions

If you get a misfire on one cylinder, and you know it's a bad coil, does the spark plug need to be changed?
I replaced all plugs but not coils since tested them and appeared ok. Then while later got cylinder 2 misfire.
replaced that coil. Now got cylinder 4 misfire.
should I assume those new plugs are still good, or should they be changed qgai. And why? Thank you for details.
 
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Old 08-10-2018, 08:03 PM
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henryting is an unknown quantity at this point
Spark plugs are quite cheap. Considering the effort you put into it, why not replace them all while you are at it instead of second guessing yourself.
 
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Old 08-10-2018, 09:18 PM
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Because I just replaced the spark plugs couple weeks ago, all 8 of them.


Originally Posted by henryting View Post
Spark plugs are quite cheap. Considering the effort you put into it, why not replace them all while you are at it instead of second guessing yourself.
 
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Old 08-10-2018, 09:24 PM
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thinking remove plugs and coils, clean plugs if blackened due to misfire, install plug and news coil. hows that sound?
 
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Old 08-10-2018, 09:50 PM
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The plugs should not be bad if you just changed them. I've had a similar issue on other vehicles and it has mostly been the coils. You can switch the coils around and follow the error code to make sure. Just use a marker to number the coils are rotate them all or just in pairs (like 2 and 4 or 3 and 5). If the error code follows the rotation it's the coil. If not, it's the plug.
 

Last edited by Victory007; 08-10-2018 at 09:54 PM.
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Old 08-12-2018, 03:34 PM
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How many miles and what year? If it s high mileage or 6 years or so old then just change all the coils.

Don t mess with the plugs ( or cleaning) if new.
It is possible to crack and new plug if not installing properly, just a thought.
 
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Old 08-12-2018, 06:51 PM
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Im sure all plugs installed without cracking. Done too many times.
Replaced plugs but no coils since were still working oK. Now looks like they start going one by one.
Replaced cyl 2, now cyl 4 code came up. So looks like they all will need changing.

2011 pan turbo with 70k now



Originally Posted by cerbomark View Post
How many miles and what year? If it s high mileage or 6 years or so old then just change all the coils.

Don t mess with the plugs ( or cleaning) if new.
It is possible to crack and new plug if not installing properly, just a thought.
 
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Old 08-12-2018, 08:23 PM
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Looks like the 6 year mark is actually a thing this time
 
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Old 08-12-2018, 10:39 PM
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Was hoping they would last more, but there is only so much life in there. Well, off to buy more coils.
 
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Old 08-13-2018, 06:38 AM
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That s what I d do.
 
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