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Hi people

I have a problem with my IAC valve, and I ready pu t a IAC from 86 Mustang 4 cyl, and works fine, but when I change for the new one , just dosnt work,
code p0509 in both IAC
Just right know I run my with the Mustang IAC

Are you trying to use the mustang IAC because you have the ford TB? I'm not sure the Ford IAC is actually working, it may just be in a position where the idle is good enough to run. I'm pretty sure the Ford IAC is a stpper motor type IAC. The '01-up Neon PCM's won't drive a stepper motor IAC. They use a linear solenoid style. Maybe try installing the neon IAC and resetting the pcm. The IAC should be installed in the position shown in the pics in this thread: http://forum.2gn.org/viewtopic.php?t=25866
The paper gasket must be used the "o-ring" will leak.
Did you cut the wires to adapt the IAC? maybe they're switched? would be hard to do since they're color coded, but had to ask.

occasional demons wrote: Did you cut the wires to adapt the IAC? maybe they're switched? would be hard to do since they're color coded, but had to ask.

Polarity on the 2-wire PWM solenoids doesn't matter. You can reverse the wires and it doesn't matter.

Yep, my bad, wasn't thinking about it being a coil.