Agreed. it is safe to run slightly leaner at idle (maby 15.5 AFR) But you generally want it to be as close to 14.7 as possible. 20 AFR is would give me a scare if I saw that on my car.It should sit at 14.7-1, is this very lean idle on a hot restart by any chance?
I don't have any exhaust leak(it is stock) with out a cat. I don't understand what you mean open downpipeI wouldnt be too concerned with running an engine low/mid 15s in light throttle situations tbh. No real heat being generated and youll be saving abit of fuel.
Id not to worried about damage from lean idling either tbh for the same reason.
Clearly not right that it idles so lean though.
Your not on an open downpipe are you? Or a bad exhaust leak?
I too have seen this and agree with what jesse888 says. It is something you can clean up with a tunable ECU I believe.If its only on a warm restart and it goes after a short drive ive noticed the same issue with alot of these cars.
Im not 100% on the cause but i think the fuel gets hot sat in the fuel rail and its vaporising before it gets the chance to be combusted by the engine. I could be wrong but thats my only theory so far.
I too have seen this and agree with what jesse888 says. It is something you can clean up with a tunable ECU I believe.
Me as well. I love Hondatas interface and ease of tuning- but after a while of using it I began to see the benefits of a true stand alone, where you could tune the finer details like post start vs coolant temp.I have tried afew different thingd within hondata to fix it but what i really need is a post start vs coolant temp fuel compensation table. Something hondata doesnt have, it only has a generic post start adjustment so any adjustments made to that table will effect the cold start aswell as hot.