audiophyle_247

So I need to up my idle to pass emissions, hoping to get it to idle at 900~950.

Engine warm, IACV unplugged, turn idle screw in until about to stall & bump it back gets a rough idle at about 600~650. Turn it out 2 or 3 turns & I can get it to 700~750, but anything after that & the rpms stay at 700~750, even if I unscrew the adjusting screw completely out & can hear air hissing.

WTF? How can I get the idle up higher?
I have Crome & its setup for exactly the idle I want, but it only works in open loop & I cannot pass emissions unless running closed loop. There has to be a mechanical way to bump idle up another 200rpm.

Searching on here found me nothing.

itsmejto

hook up the vac lines again, adjust the throttle stop screw up a little and it WILL increase the idle to whatever speed you want, it's just a mechanical screw, has the same effect as stepping on the gas. You might want to check the TPS for smoother idle.
If you can hear hissing you may have a vacuum line or other air leak. Either way, the screw should increase the idle to whatever you need.

audiophyle_247

I should be able to turn it up without over tightening the throttle cable, all that does is prevent the throttle from completely closing.

Air hiss is because the idle adjustment screw is completely unscrewed, screw it back in a hair & leak goes away, but with or without the leak the idle does not go up high enough.

There are no vac leaks, TPS is working perfectly.

Shouldnt the idle climb as I unscrew the adjusting screw until the screw comes out? (& drop as I screw it in 100%) All the adjustment I have is from 750rpm at 100% screwed out, to 600rpm when almost completely screwed in. (any more & it stalls)
I should have more adjustment than that, right?

bobjohnson

You need to plug the IACV back in after you set the base idle. Also need to turn the car off and pull the battery cable to reset the ECU. With the IACV unplugged i dont think you will be able to go higher than 750 or so.

itsmejto

It's a mechanical stop sccrew, are you on the correct screw, its just a stop sccrew.
If you turn the throttle body cam when it's idleing, does it rev over 700rpm ? that's exactly what the darn screw does, it moves the throttle cam mecanically. Hok it all back up, reset the ecu and idle it up with the screw that's under the cable arm. To prove it, tug on the cable, slide a toothpick or something over the screw head inbetween the cam stop and the screw head, it WILL idle faster.
It ain't rocket science man.

audiophyle_247

bobjohnson, thanks for the reply. That is exactly as I have been doing it and cant get it over 750.
I guess it cant be done that way.

itsmejto, are you [freak]ing serious? Of course I know cracking the throttle plate open will make the car idle faster.
The PROPER way is to use the Idle Adjustment screw, which controls the air flow AROUND THE THROTTLE PLATE.
No it aint rocket science, & I dont particularly like ghetto rigging my ride. I saw your first post & explained that is not what I want to do so let it go.