Strange MSD Digital 2-step issue

Kens429 · 06-11-2013, 09:17 PM

Joe and Lew, thanks for the response. I do have a McAmis switch mounted to the floorpan, and activated by an adjustable stop on the pedal. This stop is independent of the main pedal stop. The switch is wired in with a dash mounted light, which always works, running or not. I have not tested the blue launch wire yet, but is on the list. I repeatedly tried to simulate the failure that happens on the starting line, including your idea of pushing over center on the switch. The Gopro camera proved that the 2-step light was on, but the engine went right to the high side limiter. It is so strange that it only fails near the starting line.

Lew, I don't run the run retard yet, and haven't even plugged the computer to the box since year. It worked flawlessly until this Saturday. You may be on to something with the blue wire receiving 12 volts. I did a visual inspection, with all looking good. I did not test for 12 volts.

Thanks, Ken

06-11-2013, 09:17 PM	#1
Kens429 Junior Member Join Date: May 2007 Location: Bright, Indiana Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Re: Strange MSD Digital 2-step issue Joe and Lew, thanks for the response. I do have a McAmis switch mounted to the floorpan, and activated by an adjustable stop on the pedal. This stop is independent of the main pedal stop. The switch is wired in with a dash mounted light, which always works, running or not. I have not tested the blue launch wire yet, but is on the list. I repeatedly tried to simulate the failure that happens on the starting line, including your idea of pushing over center on the switch. The Gopro camera proved that the 2-step light was on, but the engine went right to the high side limiter. It is so strange that it only fails near the starting line. Lew, I don't run the run retard yet, and haven't even plugged the computer to the box since year. It worked flawlessly until this Saturday. You may be on to something with the blue wire receiving 12 volts. I did a visual inspection, with all looking good. I did not test for 12 volts. Thanks, Ken