Pulled the LS1 out this weekend and swapped in a 05' LQ9 (Patriot LS6 heads w/ dual springs, ARP Mains, Katech Rod bolts, TR230, .040" Cometics). Didn't get to put on my TOG header though because my welding buddy wasn't feeling up to it this weekend.
It's about 11.5 SCR and 8.6 DCR

First I think I figured out why my LS1 was so low on power. After I took off the intake manifold, I think I drained about a 1/4 bottle of Oil out of it. Stupid PCV systems.


Anyways, the new engine runs great so far. No KR even with 89* in the tank, but I haven't gone WOT yet. Haven't been able to get on it yet due to the downpour of rain that started right after I got it fired up.


I do have one problem, the engine does not want to stay idling with the rear PCV hose connected to the valve cover. If I pull it, it will idle just fine.
I'm not sure exactly what I need to tune to fix this. I'm thinking about just replacing the setup with a old school breather setup.

 

put that pig to the flo'

what made you think of the pcv causing the idle problem?

 

Congrats! Idle takes a while to learn. Does with mine anyway. Won't idle for crap anytime I unhook the battery.

 

I actually never had it hooked up at first, so the truck would actually idle. Afterwards I remembered that I forgot to hook it up is when I found that it would not idle after putting the pcv back on.

 

Unfortunatly it won't even stay at idle for even 2 or 3 seconds and it just dies.

 

congrats on your new motor what you doing with the old one. I might be willing to buy it and im kinda in the area so i could pick up... better then shipping it.

 

cograts on the swap,
as for the idle: try it again cold. last cam install I helped with was on a '04, with a "stock" tune it actually idled damn good.... for about 1-2 minutes, then it was two-foot or die. if I'm off on that account, I wonder about that vacuum pump that the 03-04 trucks have next to the brake booster, could that be interfering?

I have HP Tuners for '03 trucks, if you want to email me your tune I'll take a gander at it for you, PM me your email address

 

PM sent fellas.

 

Is your idle speed cranked up? Could the pcv being disconnected be allowing more air in and crutching the throttle blade being closed?

 

I have the idle set to 750 right now. Even with the pcv disconnected it still only idles around 750-800.
I may try to raise it more to see if I can get it to idle with the pcv hooked up.