4.4 v8 variable intake timing question

[mittie]

Hi. I was investigating slight roughness of my LR3 4.4 v8 at idle and up to 1300 RPM. I hooked up a scanner and started a live view datalog. And I found a strange issue. I see two parameters there: Intake variable camshaft timing - bank 1 & Intake variable camshaft timing - bank 2 differ by 3 degrees (43 and 46 degrees). I can observe this at idle and the same 3 degree difference stays while revving the engine. Is this normal?

 

[tlt]

Clean the throttle body.

 

[mittie]

Already did that. But how throttle body relies to the intake camshaft position?

 

[tlt]

It is all computer controlled, rough idle is a well known issue. It is most likely due to the fact they vent the PCV in front of the throttle body that they get gummy and rough idle.

 

[mittie]

Yes I understand, but as I mentioned I cleaned that, and rough running goes up to 1300 RPM, which is not idle.

 

[mittie]

Here are several screenshots, to give an idea what I mean.
Intake cams at idle:

Intake cams at 1000 RPM:

Also I noticed that even injectors have always shorter pulses (5% shorter) than odd ones:

Any thoughts?