BIDI control makes engine sound better

[samh_08]

Heres the situation:

Trims are all settled in and holding a -2% on both banks holding the engine at 3000 RPM = Sounds decent but still some subtle engine noise making it sound 'unclean'. Still holding the engine at 3000 RPM in the same session I activate BIDI controls (Gen III 1MB PCM) and start adding and subtracting fuel.

As soon as I start adding fuel, the RPM increases 300-450 with the same throttle input I was holding 3000 RPM and the engine sounds better.

This setup has brand new o2 sensors and no exhaust leaks (tested with EVAP smoker).


Am I missing something?

[joecar]

First start logging, then do bidir control, when you finish bidir save the log file, post it here.

Then, take the same log without bidir and post it here.

[samh_08]

Joe,

Maybe its something Im doing wrong, but if Im reading live sensor data, or logging, BIDI controls do not work correctly. It either says 'no response' or works unreliably.

[joecar]

Sam, post a screenshot.

Which year/model/vehicle...?