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1968-Present E-Series Van/Cutaway/Chassis Econolines. E150, E250, E350, E450 and E550

idle air control valve

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Old Mar 10, 2025 | 12:56 PM
  #1  
userid22's Avatar
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idle air control valve

we had a idle air control over speed error, changed the idle air control sensor valve, checked the connector(11.78 v), error not changed
 
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Old Mar 11, 2025 | 01:25 AM
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You need to give vehicle and engine details.
 
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Old Mar 11, 2025 | 08:41 AM
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Your IAC is a solenoid valve
They do get stuck
Did you disconnect it, and the van falls on it's face? (meaning Idles at 550)?
That's generally the first test
Disconnect it and see if the idle changes (it should drop)
Code, year of van and engine trans combo is what we need to really help
 
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Old Mar 12, 2025 | 10:25 AM
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Originally Posted by manicmechanic007
Your IAC is a solenoid valve
They do get stuck
Did you disconnect it, and the van falls on it's face? (meaning Idles at 550)?
That's generally the first test
Disconnect it and see if the idle changes (it should drop)
Code, year of van and engine trans combo is what we need to really help
Also, the IAC is controlled by a PWM signal that can't be accurately measured with a voltmeter (it is PWM on my '97, might be different on older vans).
 
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