HEMI Posted March 31, 2014 Report Share Posted March 31, 2014 Hi! I have bmw s54 coils (12131712219) Which one spark edge im using? Falling or Rising? Quote Link to comment Share on other sites More sharing options...
Simon Posted March 31, 2014 Report Share Posted March 31, 2014 Falling spark egde. But be sure to check that there is a built in igniter. Measure the resistance between the power and the signal wire. If its around 0.5 -1 ohm then you need an external igniter. If its a high resistance then it can be driven direct. Quote Link to comment Share on other sites More sharing options...
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