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Wont idle..3 iac valves and started doing it again.. Any ideas…

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wont idle sometimes. sometimes idlies...
wont idle sometimes. sometimes idlies a bit high for a short time.. Been through 3 iac valves and started doing it again.. Any ideas? Thanks. Robert
Submitted: 8 years ago.Category: Ford
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Answered in 6 hours by:
6/18/2010
Ford Mechanic: john -aka eauto, The Car Guy replied 8 years ago
john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 17,629
Experience: ase tech over 15 years in the field
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is the engine light on?
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Customer reply replied 8 years ago
no. What would the possibilities with the engine light on, and if it hasnt displayed like its doing? Thanks
Ford Mechanic: john -aka eauto, The Car Guy replied 8 years ago
i would say its likely a vacum or intake gasket leak. This will cause a idle to fluctuate. Generally they will trip engine codes generally a po171 or po174
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Customer reply replied 8 years ago
The idle doesnt fluctate consistently though. It has worked previously the last 3 time the iac valve was replaced.. Its just done it again though..
Ford Mechanic: john -aka eauto, The Car Guy replied 8 years ago
are you using factory or after market parts?
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Customer reply replied 8 years ago
they were factory, but used parts..
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