Just thought I would add my two cents to this. I have been going a bit crazy due to this. Like others have stated it is a bit better now after getting a tune then what it was on the base map. It hunts at idle all the time, idle Afr on mine is between 15.2-14.2 so if someone finds a solution please let me know. I am glad now that I am not the only one.

Appears we need other BP members to chime in.

(Throw out BP/BAT) signal. Calling jlo, puck, orange, etc. Please chime in.

P0171.System too Lean (Bank 1)

Reset, will be good to go for a little while.

I mentioned this problem last year, I guess we didn't have enough BP kits installed then.

if I understand the way the system works isn't bank 1 the first off the fuel rail feed?

could it be a bad O2 sensor. I got the PA200 code Monday. told me to replace bank 1 sensor 1 O2. its on its way

how's thr afr in open loop?

A lean or rich bank code is either a bad 02 or incorrect tuning. If your compensation table is not setup correctly you can easily get those trim codes. A bad 02 will also cause the engine to trim outside its limits and cause the code. I would log the car, easy way to tell if its a bad O2 is just compare the trims on each bank, if they are reading roughly the same then its a tuning issue, if one is consistently reading wacky then its an O2. Like I said earlier disconnecting the O2s is almost needed because mine one bank would constantly run rich even tho the target was 14.7.

I would love for a pro tuner to chime in just to see what tables they have access to that none of us do. I know Megan has it on here.

Eli @ Project X Customs tuned my car.

Before getting it tuned, I had the exact same symptoms everyone else is having here. My idle would drop between 50-150 and it feels like the car is trying to fight to bring it back up. The AFR would also bounce up and down between lean and rich. I do not remember how big of a bounce it was but it was enough for me to see that it is not normal.

Now, after the tune, the AFR still bounces but not as drastic as on the base map. The idle is far more consistent and feels normal now.

I will need to jump back in my car and really pay attention this time around to see how it is as I haven't really paid much attention to it. Mostly because it hasn't been an issue.

Here is a video I made when I was running the base map. It doesn't show it dipping much because I didn't rev it but it does show that it is bouncing about 50 rpm.

Let us know Cell, I looked at all the tables we have access to and nothing would tell it to run very lean then come back. I know there are hidden tables and features that we dont have access to. I am willing to bet it has something to do with a cat function that is still occuring. Mind you if that was the case NA builds with cat deletes would experiance the same issues and I dont recal seeing anything like that.

I'm leaning towards you might be right. I know plenty of people with TTs not having this issue even catless. a buddy of mine has cats but they are post all O2 sensors and he doesn't have this issue. my tuner builds his own single kit similar to this one but not twin scroll. he fights the same issue. I'm going to go talk to gim and get his input.

To continue the discussion...Sorry Gale for stealing your build thread but since we all happen to be having similar issues and would love a solution, figure you won't mind much. I thought about this more last night and watched it pretty closely the entire way into the office this morning.

- My AFR idle is no where close to as bad as the one in Cell's video. I bounce around from 14.6-15.2 but not as erratically as that. I'm also convinced my Innovate is a couple tenths high on readout. It's always read that way and everything checked out on the dyno as good, so I just live with it. All My idle rpms seem to be pretty close to inline with his.
- One thing to note on my tune. The problem in question was much worse on the base map from Vince. I even sent some log files thru Sasha to him, received an updated base map and it didn't make it any better. I mentioned it to my tuner when I got my custom tune. I don't know what else he might have done behind the scenes but I know for a fact that one of the things he did to compensate was adjust off throttle idle timing. If I remember correctly when coming off throttle and dropping rpms, he added additional timing starting about 1200 rpms until my idle set point at 850. He told me he did that to specifically fight the hiccup we are all experiencing. It didn't fix it but it's way better than the original base map.
- To throw another monkey wrench in the discussion. I performed the throttle body relearn procedure a few weeks back. The first couple of times I ran the car after that it almost completely fixed the issue. Within a day or two it was back.

All in all no real solution from me but figured I throw the items above out as additional data points. I would love nothing more than to get this figured out because it really pisses me off to have a car that I worked this hard on and spent this much money on and it just doesn't idle right. Makes power all day, runs great in open loop but has random hiccups under no throttle.

To throw out some help if I can.
I had a similar issue (bank 1 lean code) when I was on a canned GTM tune. We found out it had to do with the MAF/fuel tuning was not 100% and needs to be adjusted. A custom dyno tune seems to have fixed it for me, until a breather hose snapped and my idle can get a little off (being fixed right now).

*NEW Thread added to tuning section* Link below
 

Guys, since this is affecting a few guys I made a new thread and quoted most of the tuning talk from here. Hopefully some of the tuning gurus will take notice and have some advice.

http://www.the370z.com/tuning/93796-...ml#post2891930

Not knocking your response but I think this is more deeply rooted than just a tune problem. We are working with at least four different tunes here and all still having similar results. BTW who does your custom tuning?

On a side note, how are those temps now that we have reached the lovely dog days of summer?

It might be more than just tuning with so many having issues, also my setup is a SC so slightly different variables but I know many with the GTM SC had this issue early on and a good tune resolved most. This is what I was told awhile back on why mine is probably acting funny (idle drops then throws lean code): I have found that by tuning the MAF sensor before adjusting the fuel comp table keeps thing acting alittle more closer to stock since the ECU looks at the fuel table last and uses the MAF sensor first.

/OT
Temps are still the same, sitting in bumper to bumper traffic in 100 degree temps can push it up, but the moment I start moving (faster the 30mph) the temps quickly drop back down to normal. General cruising around town though I see 205 water temps and usually 5 degrees above ambient intake temp.
/End OT

hmmm.....