84ta406

iTrader: (6)

Hey guys, looking for some help. I just put my 402ci LS2 in and when I started it for the first time it fired right up, seemed to try and idle for 2 seconds and then the rpms started to race up to about 3500-4000rpm before I killed it.

I am pretty sure, like 99%, that there isn't a vacuum leak on the intake. If there was I would think it would have to be huge to cause that to happen? of course the laptop died before I started it so I couldn't get a log, but I wanted to see if anyone could look at my tune file and see if there's anything you noticed that could cause this to happen?

If there is a vacuum leak, what am I looking for on the logs?

Codys89RS

My idle kept idling high and hanging. I did a IAC reset and it fixed it. Check the throttle blade. Mine was barely open but enough my rpm on startup would hang at like 2700

84ta406

iTrader: (6)

I have a DBW Nick Williams 103, there is no IAC on it.

G Atsma

NO DBW TB's have IAC. That's a DBC-only feature.

84ta406

iTrader: (6)

That's what I meant. Was just pointing out what I was running. I am leaning towards a vacuum leak of some sort right now. Hopefully I can take a crack at it this week some more.

84ta406

iTrader: (6)

Took everything apart today and while doing so I found two issues. One, the Dyno shop drilled a 1/8" hole in one of the EVAP ports on the LSXrt manifold. The other thing I noticed is.. the brake booster port on the side of the intake manifold. Completely forgot to put a plug on it, my kit only goes to 3/8 and I forgot to grab one from work.. oops. Starts up like a champ now, idle definitely needs some work as it started to surge when it came down under 1000rpm. I'll post the log tonight if someone can look at it and point me in the right direction to clean it up. Still waiting on a AC bracket to come in and then I can button up the rest of everything.