- Tue Jan 24, 2023 5:40 pm
#60815
Izzy46 wrote: ↑Tue Jan 24, 2023 12:17 pm I've checked the output of Ignition 1 (pin7) and it's 0.15v when cracking. I seem to remember that previously it was 1.1v when cranking but am not 100% sure....Your reading is an average, of mostly 0V an an occasional 5V dwell pulse. The concern is if it is substantially different than before. Compare tune settings and check wiring connections if a problem exists.
Izzy46 wrote: ↑Tue Jan 24, 2023 12:17 pmI'm hoping that my tune settings are correct and that the attached tune will produce a spark from a GM 8 pin module? I'm wondering if someone could kindly take a quick look to see if the basics are in place?Offhand, looks OK, if everything is connected for how the tune is set. Are you following the GM7/8-pin setup outline in the Wiki? If the module B pin (Bypass) is grounded, the distributor should fire without signal from Speeduino (self-fire).
Izzy46 wrote: ↑Tue Jan 24, 2023 12:17 pmI'm also a little puzzled as to why "Trigger Pattern" is set to "Basic Distributor" rather than "GM7X" given that I'm using a GM 8 pin ignition module?The GM 7x is a special crank/cam signal decoder for certain GM engines with multiple waste-spark coils. It is not related to the GM 7-pin or 8-pin modules. The GM HEI distributor outputs a basic distributor signal, so that's the decoder used.
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