Misfiring - Water ingress in Spark Plug port.

[aidanhudd]

Struggling at the moment with my Mk5 GTI.

The car has been misfiring and after plugging the car in and looking at the spark plugs and coil packs, port No. 4 has an ingress of water, which is obviously causing the misfire and corrosion to the spark plug and coil.

Has anyone ever experienced water ingress in the spark plug port? and also why? how can I stop this?

I can obviously replace the plug and coil, but I need to prevent the ingress of water to stop this reoccurring.

Thanks for your help,

Aidan

[pudding]

Did you inspect the coil's weather seal?  If it's hard and brittle, or ripped, or a non-genuine coil, that's probably your answer.

Pretty hard to get a lot of water down there with the OEM engine cover in place though, or has yours got an induction kit, which exposes the coils?   If so, someone jet washing the engine could be another cause.

[aidanhudd]

Did you inspect the coil's weather seal?  If it's hard and brittle, or ripped, or a non-genuine coil, that's probably your answer.

Pretty hard to get a lot of water down there with the OEM engine cover in place though, or has yours got an induction kit, which exposes the coils?   If so, someone jet washing the engine could be another cause.

Yeah I've got the OEM engine cover fitted. Maybe just the coil seal! Replaced and running okay for now, hopefully the new coil will sort the job.