Honda Hunter

My idle is way to low right now for my setup, a 383 with a somewhat big cam LT1. I used tunercat to set the idle 3 times and the idle stays the same or moves up slightly. I set it to the max and I still idle around 500 rpm's so I know now it's not the tuning but something else. I dont see any vaccum leaks so I'm lost. What else controls the idle? I cant even turn my wheel in idle without it cutting off and the smell of gas is killing me and my eyes. Any ideas?

turbo_Z

Crack the TB blades a little.

1racerdude

Crank open the blades with the idle screw the computer will adjust.

atljar

What they said. The car is trying to breath in more than the blades allow. You want to try and get your IAC counts at 35-40ish at idle, fully warm.

Honda Hunter

Awesome. Thanks for the advise everyone.

OBE1 95Z28

The stock TB has a "bleed hole" in the lower center section to supplement to Idle Air Control feed during idle. This hole can be slightly increased (drilled) to get your IAC counts back to where they need to be for your mods.

atljar

Ya but thats a permanent fix. The TPS has a big idle range you can play with so adjusting the blades is normally a safer route IMO.

turbo_Z

Thats actually the approach Id take but a lot of guys dont like taking power tools to their car parts even if its a stock TB. IMO though keeping the idle air flow within the IAC passages of the intake helps the idle quality.

Injuneer

Are you sure the IAC valve is responding? Does the PCM try and increase the PCM count when you raise the idle setting in the PCM? If the IAC is max'd out and the idle speed isn't increasing, either the IAC valve is dead or the passages are plugged or too small.

Honda Hunter

I adjusted the screw and now it idles at what it was set at. Once I hook up my scanmaster I should e able to check the iac. Also I keep getting the map sensor code, 33 but only at idle. I'm sure it's the cam but it's annoying. lol