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  1. H

    [SOLVED] Crank, no start, no spark - absolutely stumped!

    Car: 2012 Mazdaspeed 3 2.3L Issue: No recent changes or accidents, car worked fine one day and next day would not start. Installed new battery and no change - 13.8v measured. For diagnostic tools I have a Cobb AccessPort, OBD II with Forscan, test light, multi-meter and backprobes. No...
  2. H

    [SOLVED] Bucking at WOT and melted ground electrode on Cyl 4

    First a little background: I'm the second owner (bought Aug '22 with 155k miles) of 2012 MS3 with Cobb Stage 2, tuned, HPFP. Turbo blew within first month and was replaced by a mechanic I trust. Since I've owned it the car has been driven very gently - just used on short (10-20 mile) trips as...
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