All:
My car has had a cold start issue from day 1. I swapped from a FAST 102 TB to a NW 102 to get the better IAC port, played with the startup fueling tables, etc. Nothing has worked.
Do you think it's an airflow problem with the IAC or just fueling being off at startup and throwing the A/F? I know they are related so I may be chasing my proverbial tail for a while, but this is what typically happens, and I don't know if this is even worth logging - it might just be a listen to see what the motor is doing. But when it seemed to be "lean," it would just hit bap-bap-bap for 5-10 secs and not fire on the initial start. Then I'd wait a few seconds and try again and on the third hit or so it would fire. But it would fire, climb to 500 rpm, sound terrible, and then die. Rinse repeat. Usually on the third or fourth false start it would climb up over 1000 and nearly catch. Then I knew, it was go time on the next start. And it would fire and catch. The issue is, that's a lot of stress on the motor and battery to have 5-6 false starts before it catches. I assume that's a lean condition and over time it builds up enough fueling in the chamber to actually "light off."
I added some fuel in the cranking tables... and I added too much. It would fire on the first hit of the starter and immediately die. I leaned out the tables (still richer than stock for First Pulse) but it still doesn't want to light off correctly. My wideband doesn't really seem to pick up much from lighting off for a second and dying, so I can't really see what the a/f is at the point of startup.
It starts up warm usually first or second try with no issue. And the car runs fabulously.
Any ideas? Drill out the IAC port? Drill a hole in the blade? Add more fuel? Set it on fire?
What?!
Here is my combo btw and the tune. No logs since it would just show it not starting. But I can take some tomorrow once it's cold again.
My combo is as follows:
02 Trans Am
EPS 234/242 111+3 Cam
TEA Stage 2 LS6 Heads 62cc
FAST 102 Manifold and NW 102 TB
TSP 100mm MAF with the LS3 Cartridge (disabled - only using the IAT)
Kooks 1-7/8" LT Headers and 3" True Duals
TR6 Plugs
Bosch EV14 52lbs Injectors with data from FICAttachment 49701
Racetronix Pump & new WIX Fuel Filter
FLT Level 6 4L60E
CircleD 2E 4200 Stall Converter
BeCool Aluminum Radiator with 160 T-Stat
New Delphi MAP relocated to front of FAST
New IAC Motor