Some driveability issues and idle swing

[willn]

So, I feel like I can get more out of my tune than I have right now, but that can be discussed further along in the thread.

Right now, I am having a couple of things that bother me with driving the truck. The first is that when I am in gear and rev to a high RPM, then as it falls back down to idle, it has a hard time regulating the idle. Sometimes (if I rev too high) it will actually stall coming back down to idle.

Secondly, it does this every time when I have the A/C on. I have played with the idle air tables like crazy. My VE is in line. This leads me to believe it could be something with the timing.

I have turned off the {B4358} A/C Torque Loss Spark Correction with no difference. My mods, log, and tune are below.


2001 LQ4 bored and stroked to 408.
317 Stock Heads with Comp Lifters and Comp Springs
Wiseco dished 4.030" 9.5:1 CR pistons
Comp 230/238 .600 .603 @ 114 (Spec'd by Comp to maintain towing ability)
Melling High Volume, High Flow Pump
Cloyes single timing set
All new sensors in the block.
Whipple 2300AX (about 6psi now)
Fully built 4L80E
Circle D 278mm 4L80E Torque Converter 2800 stall
Tru-Cool 40K Transmission cooler
1000cc at 43psi FIC Injectors, so with manifold referenced they are about 114lb/hr @ 58psi
Pacesetter 1-7/8" LTs Tri-Armor with true dual 3" custom system
Volant CAI with Scoop
Intercooler Kit - CX Racing 31x12x4
EFI Live V1 going to COS3 and SD tune.
34" Radiator w/ '05 Efans

[joecar]

Which intake manifold and throttle body do you have...?

[willn]

Stock 2000 Silverado intake and throttle body.

Should my spark and LT's jump around at idle so much?

Is that because of the cam?

[statesman]

You'll never get a good tune with those fuel injectors.... your bank 1 is trimming at +10 while your bank 2 is trimming at -10. Those injectors are junk and need to be replaced.

[willn]

What if I don't use trims?

There are a lot of guys that use these injectors without a problem.

What about going back to MAF? Would that help the ECU compensate for some of the injector issues?

[willn]

Anyone?

Since I am doing CL, would OL be better? That way I am SD OL?

I thought getting feedback from the O2s would help to adjust the fueling, but that could be what's throwing it off..

[willn]

So I decided to try and go back to the drawing board this weekend. I reset my VE table to stock, added 15%, disabled MAF, and tried to do the AutoVE process. The problem was that no matter what I changed the VE to in the 400-1600 RPM range, my LC-2 was just pegged at 22.4. When it was in the higher RPM range, like 1500, it would fluctuate more, which told me it was working.

I had the 400-1200 range in the VE table in the 100's. I know this isn't right. I messed with it for several hours and eventually went back to the original tune that is in my first post. That tune works OK, just feel like I can get more out of it.

Also, the stalling when the A/C is on. No matter what I change, I cannot get that to stop.