Knock retard issues and P2A00 error code

[Itsuki]

Hi, guys.

I'm having some issues with my Euro S2K. I've a top mount turbo setup, with ID1000 injectos, colder spark plugs (9's), and custom piping.

First of all, the car is suffering false knocking on cylinder 2. I reviewed the spark plugs several times, and I didn't see any trace of knocking. Also is always knocking only under low throttle driving. But when I try to go on WOT or in open loop, as the rpms raises, the knock retard appears, and make the ignition values too small so the car starts backfiring. So, only few times when the knock retard don't get high, and the ignition timing is around 12º, the car works fine.

I read that some people are suffering this issue with the cylinder 2, and the only solution I find it's to modify the knock sensitive. Has anybody find any part that makes this false knocks appears? I reviewed the entire car, and I can't find any suspicious vibration (only the noise from the manifold or the turbo would be reasonable. Internals are stock).

And the other issue, the P2A00 error code appeared also. I'm always riding with the car with live tuning. I read that this could make the closed loop more erratic with the short trim corrections. When the car iddles, the O2 sensor is always going up and down like a roller coaster under 13. to 16. AFR In my AEM WB, is not that much variation, but it's also swinging. Can I do anything else that replacing the O2 sensor? Could be the live tuning an issue for closed loop operation?

I've attached a datalog where you can see the false knock, and the error code showing.

Thanks!

[Spunkster]

You need to post your calibration as well

[Itsuki]

You need to post your calibration as well

Here you are!

[Spunkster]

List everything that has been done to this engine/ vehicle, do not leave any details out.

[Itsuki]

List everything that has been done to this engine/ vehicle, do not leave any details out.

Sure:

Precision 6262
Skunk2 70mm exhaust
Tial BOV & MV-S (38mm) Wastegate
ID 1000 injectors
9ºs Iridum plugs

[Spunkster]

Has the valve cover been off or cams replaced?

[Itsuki]

Has the valve cover been off or cams replaced?

No, the internals are 100% stock.

[Spunkster]

It sounds more like a mechanical issue of some kind since it is in just one cylinder. Perhaps you need a valve adjustment.

[Itsuki]

I didn't give any feedback because we are waiting to an update with the wastegate. But we did a valve adjustment. So hope in a couple of weeks I can confirm that was the problem.

Thanks!