what's the first thing you look at??

 

1. Make sure you have a wideband oxygen sensor input & calibrated into what ever ems you are using.
2. Monitor intake air temperature, coolant temperature, error codes.
3. You monitor air fuel ratio versus rpm versus load & make changes appropriately.
4. On some vehicles you will monitor knock, (not honda/acura bseries as the knock sensor sucks).
5. Ignition timing versus load/versus rpm etc....

The list goes on.

 

1. i do plx to s300 i can datalog a/f ratio
2.ok
3.how about this found on hondata s300 (show estimated change in fuel to reach target lambda)? should i use it
4.disable
5.ok

thanks

 

You can set target lamda parameters & use "auto tune" suggestions to make modifications, however I recommend using datalogging & common sence.