Tuning/Install/Hardware Problems?
 

Relevant background first:


91 Chassis

BP4W engine (running strong for the last 3 years) -> CAS removed for stock cam & crank/crank wheel

FM kit (w/o ecm) with EV14 550cc injectors & gt2560

DIYPNP built with sequential injection & boost control, mtx-l wideband (built in 2016, tested successfully briefly, put away for the future)


Finally got off my ass and installed my FM kit. Installed MS, wired for sequential injection (checked continuity between PCM and injectors to verify wiring order), true cam/crank, & boost control (followed all directions on trubokitty). During MS setup & troubleshooting, I realized that I had the signal & 12v lines on the crank swapped. Swapped the wires and now I get a clean composite log.


Using a 9093 base map from trubokitty, the car runs like it has a hard miss. I understand that it's supposed to be a rough map, but it barely stays running. AFR drifts extremely lean (18-22), Auto-VE tune puts values of ~80 in the idle cells, the cat glowed at one point, spark plugs were fouled black. I have spent the last several days reading every forum post & MS manual that seems remotely relevant to try to troubleshoot this before asking for help.... However, now I am stuck and swinging in the dark.


This evening, I started with the assumption that it was an install error. Decided to start at the injectors. Key on engine off, I have 9.0V across each injector pair and 12.0v from white/red to block (battery is slightly depleted from cranking tests). This seems indicative of a grounding fault. Testing it with a 12v supply on the bench yields the same results at each injector output.


Any direction that you guys can give me would be amazing.