Idle air control over speed error - replaced everything - Mustang Evolution

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Old 03-22-2015, 07:48 AM   #1
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Idle air control over speed error - replaced everything

Hi everyone. I'm having some trouble with my 2001 Ford Mustang Gt. It has cold air intake, exhaust and a typhoon intake manifold. I noticed while driving my my rpm's would go up and down by itself and my idle in Park and neutral only would be high (1000-1200 rpm) I decided to clean the throttle body and maf. Next day I get a p1506 engine code (idle air control over speed error) Cleaned iac. Didn't fix it Replaced pvc hose and all the other hoses. Didn't fix it. Replaced idle air control valve. Didn't fix it. Cleaned throttle body and maf again. Didn't fix it. Did idle relearn. Didn't fix it. Checked iac connector with voltmeter meter and it was good. Took iac valve back and replaced it with another one just incase I received a bad iac. Didn't fix it. (I'm reseting the engine code with my obd2 device everytime I try something to fix it) I'm not sure what else to try. I'd rather try and fix it myself and save some money instead of taking it to a shop so any help from you guys is very much appreciated! Thanks!
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Old 03-22-2015, 12:19 PM   #2
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Check for vacuum leaks.
With the engine running, spray some carburetor cleaner everywhere that there could possibly be a vacuum leak and listen for any change in the idle.
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Old 03-23-2015, 04:54 AM   #3
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last time i had a idle air control valve over speed error was when i tried to modify the gasket with a smaller hole. dont know if that helps at all.
2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
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