1g throttle body in 2g

[wlsofstl]

I recently installed a 1g throttle body into a 2g. this is in a gst with stock turbo and no porting to the intake mani. The issue I am having is that once i start up and warmed up, the idle is at 1800 rpm. After driving for about 10 minutes, it idles high sometimes still at 8-900 rpm and other times too low at 600 rpm. The biss screw is all the way in (reused the screw from 2g tb) and the tps is reused from the 2g tb as well. I have heard that with this switch, it is hard to set the idle just right, do any of you have the same experience? I dont have any way to tune but regardless, I have heard of people with the link and afc and still having a hard time setting the idle just right. Any ideas?

 

[boostle]

The BISS screw is all the way in? Have you backed it out a little to bring the idle speed up a little? Does your car idle fine when it's cold, then drop too low once it heats up?

 

[dave99gst]

did you use ISC motor from 2g?

 

[Red GST]

you know i had the same problem when i installed the 1g tb into my 2g and it took me a month to figure out that my cruise control plays games with the idle try moving the cruise control around by pulling up on the throttle cable it prolly just needs readjusted to the bigger butterfly thats what my problem was it bugged the hell out me

 

[RamenPride]

i adjusted the TPS before I had the AFC by jamming two wires into the connector at prongs 1 and 4 (I think) and reconnecting it. I attatched the ends of the wires to the probes on a multimeter, turned the key to the "on" position, and rotated the TPS until it read .48-.49 volts.

 

[wlsofstl]

thanks.