Lean idle?

[SleepinGVR4]

Why would my wide band say I'm running lean at idle but stoich at cruising speeds?

 

[Hertz]

Are you idling at the speed your ECU expects?
What are your ISC steps when idling? Are you at the end of the adjustment range (BISS)?

 

[1941Galant]

His chip is set at 850rpm, and that is what his car is idling at. I'm not too sure about his BISS, but I don't think it was in the bottom range when we set it a few months back (this will be checked). This started happening right after he put my spare E3 16g on for his blown E3 16g. I just talked to him on his break, and he is going to check the intake couplers when he gets off of work, but aside from that we don't really know what could cause this.

 

Any air leaks are going to effect the idle much more than cruising closedloop, due to the quantity of air being drawn in. What was the LOW TRIM like before the swap?

 

[SleepinGVR4]

I'll have to check the logger and see what is was before the swap. I know now its at like 80%. After work tomorrow i'm going to connect my WB to my ecu so i can log it and do some pulls because i'm having knock issues as well.

 

[prove_it]

80% trim? ahh correct me if I'm wrong, but that seems a bit out of spec, like by 75% maybe.....

 

A LOW TRIM of 80 actually indicates that you *were* >5% too rich at idle before. Did you reset the ECU recently, to reset the fueltrims?

 

[SleepinGVR4]

I don't know how to reset the ecu but when I replaced my 16G I did flip the breaker that's inline with my battery.

 

[Hertz]

That will do it. /ubbthreads/images/graemlins/smile.gif