Well,
I will be installing new knock sensors and pcv valve soon to see if thats maybe why I'm getting kr on my 99. No audible knock, just what my predator scan tool is showing- 7-8 at wot.
55,000 miles,
12.2 degs timing at wot.
IAT usually only a few degrees above outside temp.
93 octane, 160 stat,
no egr (last 1000 miles)
long tubes, no cats
cam/springs
t5 55 ngk
-No efi live or atap yet. Also no air fuel metered.
I was going to try some 100 oct mix after all this to see if I actually have knock somehow.

Reading the internal section I came across a few methods of top engine cleaning. Through the truck's 50,000 miles I added Berrymans chem tool to the fuel tank, usually every other oil change. I havn't looked at the intake head ports yet so I'm not sure how gummed up it is or if cleaning is even needed.

Instead of cutting and pasting- here's some shortened versions of what I found
1)The most involved.- removing plugs and pouring liquid cleaner in, start up and blow out,(messy,I was thinking maybe sucking the **** out before cranking it up to decrease mess in engine compartment even using rags)
than let sit,(3-hours max, to not leak down into oil) put plugs back in, take for a drive, change oil maybe plugs etc..

2)spray- administering through TB with intake tube removed,High idle
Maf unplugged or not, let sit, drive, change oil

3)Liquid-administering through pcv inlet on tb, 2/3 bottle feeding, 1000-1200rpms than dumping the rest in till it stalls, let sit, drive, oil etc..

I'm obviously trying to use the best method.
I also noticed some stated they saw a decrease in kr. Especially on the 99 C5
Hopefully all this with the sensors will help me.
After I'll try to get it somewhere so I can monitor with efi live and a wideband.

I also noticed the amw catch can being used. I remeber reading the 5.3's don't have the same intake-oil consumption problems as the Ls1 but has anyone tried it on the 4.8,5.3,6.0? My egr is gone so I have plenty or room.

 

I'm going to skip the top engine subject. My 99 had oil issues. I didn't notice it burning TONS or anything, but my oil catch can would routinely have some in it, and the intake had a good layer of oil on the inside.

You need to look into swapping PCM year models. I'd suggest an 02 base year because they didn't have EGR to start with and had higher timing values from the factory. That model had more TM though. No matter, the more recent years don't have near as many issues with false knock as the 99 model. I fought false KR for years on my 99, and didn't really beat it until I desensitized the sensors.

Take a look at this thread (notice the problem in post #12):
https://ls1tech.com/forums/showthread.php?t=174735

And...:
https://ls1tech.com/forums/showthread.php?t=175985

And this one (notice post #5):
https://ls1tech.com/forums/showthread.php?t=180373

 

Thanks,

Big Tex-
""On my 99, I went table by table and edited my 99 file with the 02 values. It ran fine, but not much better than before. The 02s do have more timing from the factory. One thing to note, LS1 Edit doesn't show every table and setting in the PCM. I know the 02s have some differnt internal parameters that can be messed with using edit. The 02 is going o be setup without EGR, and the fueling, timing, and other ratios will be different because its not expecting EGR to alter the A/F mix. My point is that just mirroring the 02 edit tables on a 99 PCM flash won't make the 99 an 02 tune. Think of it this way: LS1 edit gives you access to the parameters that the motor follows. But a big part that isn't seen is how the PCM uses those values. I think you would be better off taking an 02 PCM and tune and making that your PCM. If you do, you may have to upgrade to 00+ injectors if you haven;t already."""
__________________

_ Ok I see now,

Nelson updated my tune so I don't have any TqM, No cats, no egr and the tables are set up for my cam. 212/218 high lift. My 02' levels are right on as is my ltrims. According to the predator.

I'll prolly go with a catch can for good measure, throw new sensors in. Mix in some 100 octane and due a cleaning. I just bought some liquid cleaner from the dealer and going to do the T/B trick.

 

Hey James if you need injectors I have my stock ones. Let me know.

 

I'll pm you


99 5.3-21lbs
03 5.3-24.6 lbs

 

My 99 PCM is now an overly large paperweight. The 02 PCM worked wonders in my truck. Now that I hear updating my 99 wont help, im not sure what I am going to do. All I want is to get rid of the battery light flashing every now and then. Then maybe update my Edit cable for use with this 02 PCM. I havent changed my injectors yet. I did see that they were a bit bigger for 02 but didnt think much of it. Maybe I need to do that...

 

I think I'm going to get some top engine spray from the dealer tomorrow and see if it helps my knock retard. My intake has A LOT of oil in it, probably gonna smoke like a crack fiend when I'm done.

BTW, I cleaned my TB a little over the weekend and after putting the air intake back on forgot to plug the MAF sensor back up. The truck drove fine for about 50miles except for the trans shifting a little hard. Then all hell broke loose. The truck would barely stay started and the transmission felt like it was gonna rip the truck apart. Remember to plug your MAF back up if you take the intake off to clean the top end.

 

[QUOTE=XLR8NSS]The truck would barely stay started and the transmission felt like it was gonna rip the truck apart. QUOTE]

I've done this too. I was rolling in traffic when my trans shifted from 1-2 at 10 mph. It hit like a ton of bricks. I thought I'd been rearended.

 

Well
I got some GM liquid top end cleaner, they were out of spray.
Going to pour it through the fresh air hose on the side of the tb.

I ordered a catch can from the AMW GP for good measure.
I got a new pcv valve, Knock sensors and intake gaskets. Going to try to install Monday.

I got some 03 injectors from Flat to replace my 99's.

After all that I hope to run some higher octane( they sell about 30 miles south of me) and whip out the old predator scan tool to see if the KR is Gone.
Hopefully with that nelson can update my tune for the slightly larger injectors.

Maybe than a laptop, EFIlive, an innovative airfuel meter ,,... Holy F*ck it never ends

 

Is there any way to upgrade to the 02 PCM without having to get the LS1 Edit cable updated too?