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I heard that guys have problems when not properly locating your iac. It has to be after the maf, but if setup properly it should idle just fine
Im running a blowthru setup currently and my IAC sensor is still right after my filter on my procharger intake tube, IAC really shouldn't affect the idle it just reports the temperature of the intake charge. Im throwing a power pipe on so I will be relocating mine to the discharge tube before the throttle body and don't anticipate it to effect anything with the tune, but I won't know untill its finished.
The IAC valve does have alot to do with idle. The IAT is what reports the intake temp.
That's what I've always thought as well. I've read about guys having idle problems because they didn't have their iac setup properly, relocated it to after the maf and wala