[00mustang95]

i just replaced my iac valve a week ago because the rpm would go down and the car would sometimes stall. when disconnected my old iac valve connector nothing would happen to the rpm which means its bad. i purchased a new one and installed it. now when i disconnect the connector the car idle would drop by about 100 rpm and the car idled fine. 2 days later my car is turning off after startup and the car is making a humming noise during startup and acceleration when i disconnect the iac nothing happens to the rpm but this loud humming noise goes away. could it be that the iac i brought broke in two days time or that there is something causing it to break.by the way its a 99 gt and i purchased the iac from rockauto but this one has a black cap on it and my old one diddnt.

[Alfiedagr8]

It does sound like the iac is bad. By the way never buy aftermarket iac. Always buy from ford. And for future reference. If u disconnect an iac and it doesn't change. U still need to test further. You need to check base RPM. Then u can try pinching off the iac tube while disconnected and see if it affect rpm when its disconnected.


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