If you have been tracking the C5 issues, one is the LS1 eating oil.
Some have to put a quart in for every 1,000 miles or less.

One of the claimed issues is the PVCs lay horizontal and when PVC is open,
it causes oil to back up into the intake manifold and burn that oil causing
lots of carbon buildup in engine causing more knock.

So the claim is if the PVCs were vertical the problem would go bye bye.

Here is the next Rebel project I just finished.
http://teamzr1.com/pvcinstall.html

It has images of my install process.

In short inline to the PVC that gets tied to intake is now two filters and horizontal is
a drain tank so that oil no longer can get into the intake.

See if you buy the thought process and you think it's going to work ?

I'll begin testing to find the real answers . . .

I installed the PVC modified kit and the results of 5 runs grouped together as to knocks is no better then before the kit.

If you think about it, the little filters in the kit would be full in no time if in fact lots of oil was being sucked through valve cover into the intake.

In swapping the LS1 to LS6 intake manifold, I looked closely in the intake and yes there was signs of oil but very little.

Thus it goes with the finding when I did the re-carb that the engine was not very dirty.

In looking at the PCM traces I see knocks all over the RPM and speed range, in fact knocks as low as 7 MPH and as low as 1,200 RPMs.

Now if I read the knock design details correctly, knock is not suppose to respond if less then 1,650 RPMs and less then 20 MPH. If that is so then I should not seen knocks in the traces below that value, but I do.
I have a hard time thinking a LS1 would knock at only 7 MPH but mine does or this proves all along that it is either ill designed knock sensors/circuit or they are way too easy in pointing a finger as a real knock.



In this graph, with 59 knocks, only thing I could see common is no ping if less then LTFT of cell #9.

So now what do we do, teflon the sensor threads ?

A similar thing was occuring on my C4 where the knock sensor was overally picking up knocks. What we did was replace it with a LT4! version and then with the hooker headers and exhaust it ran with no knocks.

George