Installed new injectors, now it won't stay running

[scotty305]

Blipping the throttle usually adds extra fuel for acceleration enrichment, if this is helping the engine stay running I would suspect the main fuel map is far too lean.


Assuming the old 1000cc/min injectors had resistors installed, did you remove the resistors when changing to the new injectors? Running high-impedance injectors with ballast resistors would screw with their opening times and could account for this sort of behavior.


Also, the fuel map should need about 30% fuel added, assuming the injector latency/deadtime/battery offset compensation was correct for the old injectors and has been adjusted correctly for the new injectors. Sorry I haven't used a PFC so I won't know the exact option names or values to use.


For what it's worth, my car (stock engine, stock ports) ends up at 2-3ms of fuel injector pulsewidth at idle using ID1000 primary injectors. If you're below that with your 725's, you should definitely add some fuel.