Can't get car to idle longer than a few seconds, VATS Disabled

[Mr. Sketchy]

Hello, I'm having a problem keeping my new engine running for longer than a few seconds despite it having the VATS disabled and firing up without problem.
The engine is a 383ci. LS6, in a 2002 Corvette, with a stock LS6 intake manifold, MAF and throttle body, ported 241 heads, LG long tubes, and a Trick flow cam (112 lobe sep. 15 Degrees Overlap, 238/242 Duration @ .05, .595/.595 Lift ) I've increased Idle speed, added to the Base Idle Airflow table, and increased the timing in the Idle range, but I'm still unable to keep the car Idling.

When I start it, the engine fires up immediately to around 1,300 RPMs, then settles to about 1,000 RPMs for a second or two before dying as if it's lost fuel pressure (Scan Below) . The VATS has been disabled, but it's still acting as if something is shutting down the fuel pump. Because of this, I tried bypassing the fuel relay, and the engine fired up, started to die, but then returned to a 1,000 RPM idle and continued to run until I turned it off (No Scan File For This).

Is there any obvious reason as to why I'm loosing fuel pressure, despite having the VATS disabled? Anything else that I can try in order to get the car to idle for long enough so that I can collect some scan data?

Thanks!


Idle tune, VATS Off, Attempt 6.hplFactory Update, Verson 3.1, ETC .21 Open, idle tune 3.hpt

[mbray01]

did you write entire for vats disable
I have had issues with vats disable in the past. I have a lengthy process I use on all cars I disable, including multiple vats writes, write entires and write calibration. Its a pain, but When I do it I know its done, especially when I do a bench flash and am unable to verify functionality on a live vehicle

[Montecarlodrag]

VATS doesn't turn the fuel pump off.
I think your engine just needs more fuel to keep running. As soon as the afterstart enrichment stops it goes lean and stalls.
Give it 10% more gas at a time and test. A rich afr will keep the engine running, a lean one will not.

[Mr. Sketchy]

Thanks for the responses. I'll try to write entire, just in case, and if that doesn't do it I'll try and play with the VE table. My only concern with adding more fuel is that I'm already reading between 10-11.5 AFR on the wide-band up until it stalls. Hopefully I can keep it running long enough to log some VE error values, before it dies.

Thanks again for the help!

[Crashgnx]

Not sure which PCM your using but did you hook up or change the low oil pressure/level cut off? Also is your Idle air control motor working? (take it out, hook it up, cycle the key to see if it moves)