View Full Version : TBI Idle Adjustment

10-11-2007, 04:42 PM
I was just wondering if anyone know how to adjust the idle on a TBI motor. I have a 94 Suburban with the 7.4 liter and a TBI. The darn thing idles about 1000 ~ 1200 rmp. All of my research indicates that the idle can not be adjusted but I find that hard to believe. Anyone have any experience with this.

10-11-2007, 05:01 PM
If you have a vacum leak allowing air to enter the intake, other than thru the port controlled by the idle air motor your TBI will not be able to control the idle.