SES and rough idle after spark plug change

jdt10768 · 12-18-2022, 02:58 PM

Just changed plugs, and immediately have rough idle and Service Engine Soon light,
Plugs are NGK from FCP Euro, recommended plugs for 128i
I did not use a tq wrench because I don’t own one
I did not check gaps, assumed correctly pre-gapped

Guess I’ll take it apart again now and check wire connections
Any thoughts?

jdt10768 · 12-18-2022, 04:12 PM

I have it sorted out now
One of the electrical (coil) plugs was not completely seated into its coil …
Smooth sailing now

jdt10768 · 12-19-2022, 08:23 AM

pics of orig plugs @ 62.5k miles

________ · 12-19-2022, 10:12 AM

Good fix, glad it was just not seated properly. Great when it’s something simple and free.

jdt10768 · 12-21-2022, 08:56 AM

Drove 200 miles to Charleston and back yesterday, SES light cleared itself, smooth running and seems a bit more powerful, maybe better mileage too - Probably just the placebo effect, but it did seem to run better.

iamroddy · 12-21-2022, 05:46 PM

Those gaps look huge...no wonder these cars are hard on coils.

jdt10768 · 12-22-2022, 09:00 AM

Quote:

Originally Posted by iamroddy

Those gaps look huge...no wonder these cars are hard on coils.

Yes, that's what I thought as well
I should have taken a comparison pic w/ a new plug for scale, oops

12-18-2022, 02:58 PM	#1
jdt10768 Lieutenant 336 Rep 532 Posts Drives: 2013 128i MSport 6MT Join Date: Sep 2018 Location: Columbia, SC iTrader: (0)	SES and rough idle after spark plug change Just changed plugs, and immediately have rough idle and Service Engine Soon light, Plugs are NGK from FCP Euro, recommended plugs for 128i I did not use a tq wrench because I don’t own one I did not check gaps, assumed correctly pre-gapped Guess I’ll take it apart again now and check wire connections Any thoughts?
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12-18-2022, 04:12 PM	#2
jdt10768 Lieutenant 336 Rep 532 Posts Drives: 2013 128i MSport 6MT Join Date: Sep 2018 Location: Columbia, SC iTrader: (0)	I have it sorted out now One of the electrical (coil) plugs was not completely seated into its coil … Smooth sailing now Last edited by jdt10768; 12-19-2022 at 08:21 AM..
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12-19-2022, 08:23 AM	#3
jdt10768 Lieutenant 336 Rep 532 Posts Drives: 2013 128i MSport 6MT Join Date: Sep 2018 Location: Columbia, SC iTrader: (0)	pics of orig plugs @ 62.5k miles Attached Images
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12-19-2022, 10:12 AM	#4
________ ________ 4159 Rep 2,301 Posts Drives: ________ Join Date: Sep 2018 Location: ________ iTrader: (0)	Good fix, glad it was just not seated properly. Great when it’s something simple and free.
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12-21-2022, 08:56 AM	#5
jdt10768 Lieutenant 336 Rep 532 Posts Drives: 2013 128i MSport 6MT Join Date: Sep 2018 Location: Columbia, SC iTrader: (0)	Drove 200 miles to Charleston and back yesterday, SES light cleared itself, smooth running and seems a bit more powerful, maybe better mileage too - Probably just the placebo effect, but it did seem to run better.
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12-21-2022, 05:46 PM	#6
iamroddy Private First Class 86 Rep 117 Posts Drives: 128i Join Date: Sep 2020 Location: 613 iTrader: (0)	Those gaps look huge...no wonder these cars are hard on coils.
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