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Misfire Detected

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Old Jul 23, 2020 | 08:33 PM
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Default Misfire Detected

Got for first real issue with my Turbo. 2015 with 13000 miles. Getting a
P0304 (Cylinder Misfire Detected)
P2311 Ignition Coil "D" Secondary Circuit
P0354 Ignition coil "D" Primary Control Circuit/Open

along with 4 wheel drive limited, PDCC Fault and PSM Loss.

Could this be a battery? Will you get Misfire from a battery going bad? Is a coil or plug gone bad?

Thanks
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Old Jul 26, 2020 | 10:07 PM
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Originally Posted by dbhajek
Got for first real issue with my Turbo. 2015 with 13000 miles. Getting a
P0304 (Cylinder Misfire Detected)
P2311 Ignition Coil "D" Secondary Circuit
P0354 Ignition coil "D" Primary Control Circuit/Open

along with 4 wheel drive limited, PDCC Fault and PSM Loss.

Could this be a battery? Will you get Misfire from a battery going bad? Is a coil or plug gone bad?

Thanks
@dbhajek im having the same issue. Did you ever figure out what was causing it?
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Old Jul 26, 2020 | 10:10 PM
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Originally Posted by onjacks
@dbhajek im having the same issue. Did you ever figure out what was causing it?
I about to order new plugs and and coil packs. I am hoping it's a bad coil pack. I actually started taking the car apart, it looks like its going to be a pain to get to everything. I did this on my 996 Turbo and it was a lot easier.

My car is a 2015 with 13000 miles.
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Old Jul 26, 2020 | 10:13 PM
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Originally Posted by dbhajek
I about to order new plugs and and coil packs. I am hoping it's a bad coil pack. I actually started taking the car apart, it looks like its going to be a pain to get to everything. I did this on my 996 Turbo and it was a lot easier.

My car is a 2015 with 13000 miles.
Got it. Please let me know if that resolves. I’ve got a 2012 958 with 125k mi.
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Old Jul 26, 2020 | 10:21 PM
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Originally Posted by onjacks
Got it. Please let me know if that resolves. I’ve got a 2012 958 with 125k mi.
It must not be very common because no one has posted in this thread
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Old Jul 27, 2020 | 01:39 AM
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Most likely a bad coil.
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Old Jul 29, 2020 | 05:57 PM
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Having the same with my 2018 Cayenne Platinum (@38.5K miles - had the car for a year now). OBD2 reads a low number of misfire on random cylinders. Replaced the plugs with NGKs which resolved the issue for roughly 24 hours. Replaced the dirty air filter with K&N which again resolved (oddly) for 24 hours now the stuttering is back. Coils are next... Anyone have a coil pack/links they recommend? Other ideas?
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Old Jul 29, 2020 | 06:48 PM
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Most likely a coil pack issue. The plugs are probably fouled now and need replaced. Replace all coil packs.
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Old Jul 29, 2020 | 10:54 PM
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Plugs were replaced 1 week ago. Do you have a go-to Porsche parts site and coil brand to recommend?

Last edited by twhitehead; Jul 29, 2020 at 11:07 PM.
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Old Jul 30, 2020 | 08:28 AM
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Originally Posted by twhitehead
Plugs were replaced 1 week ago. Do you have a go-to Porsche parts site and coil brand to recommend?
shop Porsche dealers for best prices on OEM parts...try Gaudin for good prices...
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Old Jul 30, 2020 | 09:05 PM
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Curious... when replacing the plugs/coils, did plug threads have any oil? If so, replacing coils still fixed the sputtering/misfiring?
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Old Aug 3, 2020 | 08:29 AM
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Coil packs were the resolution for me. Replaced them with the coil pack kit from ECS Tuning . The old plugs did not look fouled, but since I was there, seemed to make sense to replace everything.

Word to the wise, don't be lazy and use a torque wrench - I over-torqued the bolt that holds the coil in place and snapped it. I had to use a drill, a hammer and jewelers screwdriver to get the little nub out. Not fun.
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Old Aug 3, 2020 | 08:46 AM
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Originally Posted by onjacks
Coil packs were the resolution for me. Replaced them with the coil pack kit from ECS Tuning . The old plugs did not look fouled, but since I was there, seemed to make sense to replace everything.

Word to the wise, don't be lazy and use a torque wrench - I over-torqued the bolt that holds the coil in place and snapped it. I had to use a drill, a hammer and jewelers screwdriver to get the little nub out. Not fun.
What’s the torque on the coil bolt?
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Old Aug 3, 2020 | 11:41 AM
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Originally Posted by dbhajek
What’s the torque on the coil bolt?
honestly, not sure. I’ve heard hand tighten all the way to 15 ft lbs. I have the AllData PDF but couldn’t find it there either. With how weak the bolts are, maybe hand tighten is the way to go...
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Old Aug 4, 2020 | 01:31 AM
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At least for the 997.2 as per workshop manual it is 7.5 ft lbs.
EDIT: Same for 991 as per Workshop manual. 7.5 ft lbs or 10 Nm

Last edited by bleedingedge; Aug 4, 2020 at 01:37 AM.
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