Green96
10-02-2017, 06:10 PM
Several weeks ago I replaced my IAC valve with a new one from Motorcraft, no issues. Two days ago I cleaned the throttle body due to a sticking accelerator (sticking at closed). After cleaning the throttle body the sticking is gone, but the idle was high, around 1200. I pulled the battery to force a relearn of the throttle. It helped some, but the idle is still a little high (900-ish) and does not change when I disconnect the IAC valve.
I also noticed that when I rev the car it settles to a high idle (1200 or a little more) for a few seconds before dropping back down to 900-ish again.
I was always told that if the IAC valve was disconnected that the car should idle, but just barely. I am concerned that the original owner adjusted the closed position of the throttle body. I go the car in 2007 with 32000 miles. Within the first year or two I had some problems with the IAC valve. I replaced it with an aftermarket and had high idle problems. I assumed it was the off brand IAC valve. I cleaned the original and re-installed it. I am thinking the original owner had idle problems and adjusted the stop because here I am at 82,000 miles with a clean throttle body and high idle with a Motorcraft IAC valve.
Does anyone know the correct factory gap between the butterfly and the bore? I am assuming it is a few thousandths of an inch. My other option is to adjust it until the TPS sensor reads the correct voltage for 0 throttle, or disconnect the IAC and dial it down until it almost dies. I have not checked the TPS at all yet.
I also noticed that when I rev the car it settles to a high idle (1200 or a little more) for a few seconds before dropping back down to 900-ish again.
I was always told that if the IAC valve was disconnected that the car should idle, but just barely. I am concerned that the original owner adjusted the closed position of the throttle body. I go the car in 2007 with 32000 miles. Within the first year or two I had some problems with the IAC valve. I replaced it with an aftermarket and had high idle problems. I assumed it was the off brand IAC valve. I cleaned the original and re-installed it. I am thinking the original owner had idle problems and adjusted the stop because here I am at 82,000 miles with a clean throttle body and high idle with a Motorcraft IAC valve.
Does anyone know the correct factory gap between the butterfly and the bore? I am assuming it is a few thousandths of an inch. My other option is to adjust it until the TPS sensor reads the correct voltage for 0 throttle, or disconnect the IAC and dial it down until it almost dies. I have not checked the TPS at all yet.