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The lean PE issue is certainly a question mark........... two things that will help it. DO NOT ZERO DYNAMIC AIRFLOW. I say this because I suspect based on my own tuning experience the car is...

Not really sure how I'm meant to plumb that the way your saying.... behind the maf there's the TB and just behind that there's a vent left and right of it. The left one goes to the rear passenger...

May I just ask, is there anything wrong with:

Connecting my rocker cover pvc outlet with the valley cover outlet to the intake infront of the maf. Before the cam change I didn't have this extra...

I'm kinda of the opinion on this PE lean issue it's probably not a OS bug.......

Before I went from my stock L76 cam to the LS9 cam, it breathed alot better down low and never had a PE...

Mine only does it while in PE. I tried a few things, i didn't even realise that PE isn't actually open loop either....... thinking I could mix something together nup.

If set the car up in open...

My last scan the problem returned. So more investigation is required.

Sure enough in my case, zeroing out the PE MAP Requirement/Hysteria solved this for me. So either there is a issue with my map sensor/electrical issue or there's a bug in my OS. Either way ..... ...

Alright........... I have it fixed, rather I have a work in progress fix. I got an idea of what it might be.

Years ago, I found on the stock OS running VE only my map sensor would randomly mid...

the cars own calculations/torque model etc could be the issue sure...... canning TM doesn't fix it. By all means send some tables etc, and i'll give them a go.

How about is everyone only having this problem on the Custom OS? ..... Has anyone who's ran into this problem switched to the stock os on a maf only tune to see if it made any difference? Because...

So i take it this was never solved? I now have this same issue after changing from my stock cam to a ls9 cam in na. Pretty much right smack on 2.1-2.3 seconds.