First-time-turbo-owner
Member
- Joined
- Nov 24, 2013
I am doing some cleaning and tuning on my car. I can not get the iac numbers lower than 45? I have the TPS set at .42 and 4.58
Turn the idle adjustment screw clockwise to open the throttle blade. This will cause the idle speed to increase. The computer will then start closing the IAC to bring the idle back down to the target speed. After you get to the number you want,reset the TPS.I am doing some cleaning and tuning on my car. I can not get the iac numbers lower than 45? I have the TPS set at .42 and 4.58
http://www.vortexbuicks-etc.com/basics.htm#IAC (Idle Air Control) AdjustmentHow do I do a reset on the iac?
I just told you. Open the throttle with the idle adjustment screw. This will cause the computer to close the IAC to bring the idle back down.How do I do a reset on the iac?
You have to open the throttle to get the numbers to go down.The iac motor must be bad because the more I turn the screw clockwise,the further the numbers go up. The car still gas everything original.....so it warms up to 190-200. I made the adjustments slow and a little at a time, waiting in between to wait for the idle and numbers to settle back down.
Yes, when I open it the numbers go up? So something is wrong. I am thinking the iac motor must be bad?
I readjusted the TPS to .44 and tried again to adjust the iac lower but got the same results. The more I opened the blade the more the numbers went up. When I closed the blade I was able to get it down to 45-50
I readjusted the TPS to .44 and tried again to adjust the iac lower but got the same results. The more I opened the blade the more the numbers went up. When I closed the blade I was able to get it down to 45-50
I will try this procedure tonight and report back, thank youThe TPS volts will go up when you adjust and the iac will come down, but the car won't know it's idling until you get idle tps volts back at .44 or less so this is probably why you're not seeing the right results. You're opening the blade, but the car then thinks it's not idling. Another good reason to adjust it with the car off; the ecm resets the idle reading from the tps volts when you restart. If you adjust it too far, the ecm thinks you're giving it gas by opening up the blade while running.