I have done a little research on this and the answers I see seem to be the same but I want some people's opinion.

Every since I installed my 720cc injetors I have gotten this SES of Lean bank 1. Now I tried switch O2 sensors and that didn't work and my A/F ratio is about an 11.7:1. I am pretty sure it is my injectors but why would you get a lean bank 1 code if you are still running rich?

People have said it might be lean in the first couple thousand RPM's. So why wouldn't it be a problem through all RPM's??

Any suggestions or help would be greatly appreciated. I am going to switch back to stock injectors and have the 720's replaced under warranty...but I want people's opinions and thoughts as to why injectors would lean out in the very early rpm's and not in the later rpm's.

Thanks

 

I get the same thing with 1k's, IDCs are at like 55% or so WOT throughout RPMS, and I run an 10.7-11.5 AF and still get mine.

 

WHat's the IDC's???

 

Injector Duty Cycle.

 

Thank you. did you ever get the code fixed? Where you worried about running lean and hurting the engine??

 

Who makes the injectors? I used to get the same issue while cruising or during idle but I added fuel from 2250 to 3250 and at idle. No more code now.

 

I run AMS injectors. Which are Precision.

I still get the code but at idle my short terms are still messed so I need to add more fuel.