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It's a combination of all this. Heat and vibration are the main causes. Water sometimes for the coils. Oh, BTW I've been pm'd how I've sealed the spark coils on the rear engine. See pic (white strips on the cover). It's a primitive solution and I improved the look of them in the meanwhile.BTT: Rene, your silver one was stock, your red one was already equipped with CTSC and maybe header. That's where all the additional heat and vibration is coming from. And the car formerly lived in the US which may was hotter climate than cold Switerland (yes, we miss that car :tongue: There are two similiar cars on the market right now :wink.
It's a combination of all this. Heat and vibration are the main causes. Water sometimes for the coils. Oh, BTW I've been pm'd how I've sealed the spark coils on the rear engine. See pic (white strips on the cover). It's a primitive solution and I improved the look of them in the meanwhile.
BTT: Rene, your silver one was stock, your red one was already equipped with CTSC and maybe header. That's where all the additional heat and vibration is coming from. And the car formerly lived in the US which may was hotter climate than cold Switerland (yes, we miss that car :tongue: There are two similiar cars on the market right now :wink.