There are a couple of things that will cause no fuel pulse during cranking:
1. Control power on the yellow "Key" wire for the unit NOT connected to the IGN spade on the factory fuse block inside the car. If it is not connected here, it has no 12V during cranking but instead only when the key is in RUN. Unit effectively turns off during cranking and back on when key is released.
2. Bad TACH signal to the unit. The signal must be connected to the correct wire and if not using V3.0 only one wire can be connected. Also in the Main Setup the system must be set for what type of tach input you're using, coil or 6A (square wave type from ignition box and some distributors)
-If using version 2.1 or lower:
Green "CP" wire for connecting to the tach output of an ignition box if using an MSD system etc. OR
Black "SP" wire connected to the negative or - side of the coil (tach terminal of HEI) if using a standalone ignition system.
-If using version 3.0 the black wire gets connected to either tach terminal of box or - side of coil, and the green wire is used for timing control or not used if not using timing control.
Also be aware that if you're using a newer standalone MSD distributor with a gray tach output wire, that is the same type tach signal as an ignition box. Also they usually have an RPM limiter function that will sweep the tach to set limit when the key is turned on. That must be disabled using MSD's instructions OR the coil - used for PJIII signal since it effectively tells the ECU it's at high RPM and the system will dump a load of fuel initially. I have one of those and use the coil for tach signal and use the gray wire for cruise control signal.
Also battery voltage MUST remain above 9V during cranking or the ECU file will become corrupt. You can easily datalog during cranking to find out what is going on.
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