iac valve

2000 ranger 3.0. Throwing code P1504. I have replaced the IACV with 2 separate ones, with no luck. Truck starts up and dies immediately. I took off the IACV and it started and idled way high (obviously). Harness has 12v to it. Am I missing something on installing it? I install with the battery...

Currently doing a custom ECU and wiring harness on my 1997 Ford Ranger 4.0L OHV engine. For wiring purposes I need to know if the idle air control valve is pulse width modulated (PWM) or simply a solenoid that's on or off as needed. I haven't really found much information online after searching...

I've been having high idle issues for a while now. When the engine is fully warmed it will idle around 1100-1200 RPM. When shifting gears the rpm's don't drop. They only drop (very slowly) after I come to a complete stop. The engine seems to run better with the IAC Valve unplugged, around 750...

Engine races to 3k on start-up; when cold drops to 1.2 after 5 sec, then to .7; when warm, drops to .7 after 5 sec. Breaks my heart. TPS has been replaced. One solution is replacing the gasket on the IAC valve with one whose holes are only 1/4" in diameter. This makes for a rough idle and the...