Cyl 8 Misfires, Oil on Spark Plug Electrodes
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Joined: Jan 2014
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@woodepic , did you end up getting anywhere with this? Same issue here on a 2018 S6, cylinder 3 fouling with oil resulting in a misfire, plugs last around 3000km from a new plug to when it's fouled again. New AOS, passed compression test, passed leakdown, 8 new coils, 8 recently new injectors (cylinder 2 injector was previously stuck open), new turbos, screens removed. Was getting ready to tear the engine down until I stumbled upon your thread.
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Joined: Jan 2020
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Oh no, I’m sorry to hear that!
I never did figure mine out, I ended up selling the car. I’m fairly confident it was valve stem seals, but I can’t be sure. Either that or something complicated with the pcv passages internal to the engine (replacing the pcv never helped)
I never did figure mine out, I ended up selling the car. I’m fairly confident it was valve stem seals, but I can’t be sure. Either that or something complicated with the pcv passages internal to the engine (replacing the pcv never helped)
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Joined: Dec 2024
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did you solve the problem?
@woodepic , did you end up getting anywhere with this? Same issue here on a 2018 S6, cylinder 3 fouling with oil resulting in a misfire, plugs last around 3000km from a new plug to when it's fouled again. New AOS, passed compression test, passed leakdown, 8 new coils, 8 recently new injectors (cylinder 2 injector was previously stuck open), new turbos, screens removed. Was getting ready to tear the engine down until I stumbled upon your thread.
did you solve the problem?
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