High Idle after installing new turbo

[NickSJ]

Last night I installed a TE44 and Poston 3" 2pc downpipe (ported stock elbow), with a new oil line, drainback gasket, and composite 3-bolt turbo-to-header gasket.

I fired it up, and the idle in park/neutral was 2400 rpm, in reverse/drive was about 1200 rpm. Waited for about 20-30 seconds to see if it would drop down to normal, then shut it off. The only obvious leak (smoke) was maybe not a leak at all - just at the downpipe joint near the elbow, where I had put some ultra copper sealant.

I'm running a Thrasher, which normally idles at 650 rpm in drive. Also running an LS1 MAF and Translator. Also have a ScanMaster. I checked around underhood, I didn't see any obvious things (like vacuum lines unhooked, etc.)

The only thing I can think of is that I cracked the vacuum elbow which connects to actuator / turbo. Would a vacuum leak at this point, cause this?

Any ideas? Thanks,

Befuddled

 

[slimtastic]

the only think i could think of off the toop of my head would be maybe you bumped the tps and its reading out of the .50 volt maximum for idle. when i would try to advance my tps signal for timing advace and max fuel when i would go too far it would kick up the rpm to over 2000. could this be it?

 

[NickSJ]

Got it. Found the IAC controller unplugged, must have knocked it off when removing up-pipe. Runs like a champ now, that TE44 sure can melt those Nittos.

Thanks for the help