Opposite LTFT bank 1 & 2 Idle and low part throttle

[acdc-angus]

Hi,

I recently swapped my LS1 for a 383ci stroker. All sensors and gasket are brand new, except for the MAP sensor, which I reused since it was working fine just two days before the swap.

I'm actually on MAF Only :

The LTFT readings at Idle (same issue at low throttle too) seem off to me?at operating temperature, Bank 1 appears to be running about 10% leaner than Bank 2 (or -10% b1 and +10% b2).

The wideband O2 sensor is installed on Bank 1, in the same location as the original narrowband.

Vacuum levels seem normal, and there are no leaks at the long-tube headers. I even tested with my old O2 sensors and got the same results as with the new ones.

I re-enabled misfire detection at idle, and the system reports a high number of misfires on Bank 2. I suspect this is just due to the large camshaft.

I also tried disabling the injectors one by one between 91?C and 94?C. The engine became unstable each time I disabled an injector, which suggests that all cylinders are firing.

1 - MAF : Runin
2 - MAF : Idle

The car :
Camaro Z28, P59 PCM, Flexfuel (the log has 78% alcohol), Camshaft 232/238 .629/.629 112+4

1 - MAF LTFT.hpl2 - MAF LTFT.hpl

[bk2life]

fuel trims look pretty nice..

ghgf5.jpg

[acdc-angus]

The combination of the 2 yes. But individualy not.

idle.JPG

[acdc-angus]

Anyone??

[Lshungy]

Unless I understood your first post incorrectly how are you monitoring your trims if you have a wideband installed in the original 02 position on bank 1 ??

[twenglish1]

This right here ^^ Where is the bank 1 sensor installed? Post your tune file, and what fuel injectors, fuel system regulator type and fuel pressure, this is all important information before proceeding further. There are also settings that can be adjusted to optimize the PCMs O2 feedback characteristics for long tube headers, but i would focus more on the basics i listed first before getting into this. Looking at your trims vs the MAF frequency, looks like you still have tuning to do, trims are adding roughly 10 - 20% across 3000 - 6000hz