by David Ferguson on Fri Mar 24, 2017 9:54 am
Is this a new problem with a previously working installation, or a new installation/harness? If it's new, then I would double check the harness documentation and make sure you've got all the pinouts correct. Is the ECU wired to use the same injector drivers for 1/4 as well as 2/3 (i.e. are you using low-side for two and peak&hold for the others?).
Otherwise I would apply standard harness troubleshooting methods -- disconnect everything -- do you still see different voltages at the injector connectors? Check for shorts & opens. Wiggles the harness at all splices/connections to see if that changes things (this could indicate worn/abraded insulation or a broken wire/intermittent connection).
Good Luck!
David Ferguson
Veracity Racing Data