Currently working a 90 GTU S5 TII swap less 500 mi on the swap. Still running N/A harness. Having spark problems started with no trailing spark, driving home one night lost tach signal to the cluster misfiring and way down on power. the car ran ok for about a week before I started having these problems. so I had some extra parts laying around from my previous engine and some junkyard excursions. First move was to try a different trailing coil(known good unit) that didn't fix anything. Went back for round 2 about a week later tried a different Crank Angle Sensor(known good unit) same results as round1. now about a month has passed I go back I now have trailing spark but am missing leading spark. tried switching PCM to an N351 N/A PCM no improvement. I am Auto Tech by trade so I feel like I should know this, and I know just winging parts at the thing isn't the proper way to diagnose this but hey I figured it was the easiest way to get an answer. Any advice on how to chase this problem or possible suspects would be incredible.

 

you can pull codes on your car.http://www.banzai-racing.com/FD_S5_error_codes.htm

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