Mach 1 iac valve in a 4.6 gt

solodriverz

New Member
Jun 3, 2026
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0
1
NV
I mistakenly bought a iac valve for a built or cobra with no iac hole for the intake. It's smaller than oem . I took the hose from iac and flipped towards the front like a second exhaust intake air filter. I know it might be sucking in hot air but more air is better, right?. So far it runs real good except when I start it, the rims drop big time, slowly comes up as car several moments or if I give it some gas.
My question is is this ok with a different iac valve meant for a more performance car or can I use it without messing up anything.
After it warms up, car drives smoothly and idles normally.
 
Having just gone through IAC issues, I would recommend replacing with a motorcraft (can source a few places) 03/04 mach iac only. My car had all kinds of odd little things from a slowly dying stock one. Replaced with new motorcraft and tons of issues/annoyances are solved.