7427 data logs closed loop issue

[dave w]

Hello everyone,
I have a 5.7 TBI from a 92 G20 van in an S10 with a 4l60e. I rewired the harness for a 7427 computer, the computer is running the stock tune. The truck runs well in open loop, but when closed loop activates the RPMS at idle bounce around, runs rough, and eventually stalls. I used tunerpro RT with Advanced $0D TP5 v251 XDF and A217 $0D TP5 v250 ADX to take these logs. I have attached 2 data logs, one just idling, and one with a few stabs of the gas pedal. Any help would be greatly appreciated!

It's running rich. Try changing the injector flow to a higher flow rate to lean things out. For example change the injector flow rate from 61 lb / hr to 64 lb / hr. Increasing the injector flow rate will cause the PCM to "think" less fuel is needed for all RPM's and Kpa's.

Gearhead Post 12-31-23.jpg