I have a 2002 4Runner with rebuilt supercharger, URD 7th injector with AIC on board.

I recently installed this set up.

I have the following questions:

Closed loop:
I am measuring ~+13-15 long term fuel trim at idle with a GoPoint OBD2 scanner? At 2500 rpm it is ~+4-6. Is this normal with the URD and supercharger?

Is the reading "adjusted" by the URD?

Should I even care about this unless there is a vacuum leak or other issue?

I just want to insure my truck is running properly since I now have black soot on my tailpipe. Seems to run great no knocking.

Thanks

 

This is just hear-say, but I've heard that running premium fuel will adjust your long term trims like that. I have no idea what my trims are at- never have cared to know. I calculate my gas mileage at every fill up, and have an AFR gauge so I can monitor my closed and open loop AFRs. If either of those goes out of whack, I have a problem. Otherwise I let the ECU do it thing, and it does very well.

 

Thanks for the reply. The truck runs great! I just want to make sure everything is running properly. What AFR gauge do you have? I'm going to get one.

Ian

 

Really important if you're doing any kind of boosting, IMO.