- Tue Jan 24, 2023 5:40 pm #60815
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.
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).
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.
-= If it was easy, everyone would do it =-