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Old 05-25-2014, 18:17   #1 (permalink)
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Idle air control valve> How to verify it's working

Still working on my newly acquired 99 4.6L e150.
Got a Cylinder misfire code on # 5, also a IACV code. put new plug wires on it ( quite the job ) and a new coil on passenger side bank. Pulled the IACV valve ( more than quite the job ). It seems to work if plugged in and ignition turned on but the solenoid is not pulling the valve all the way in, not sure how far it's supposed to move . Sprayed the solenoid and thought I had it freed up but again, not sure. That part is one tough mother to get off, period.
Thinking next step is to check the fuel injector on # 5 . Tried a compression test but tool is not working BUT the cylinder blows out air when cranking ( like a blown spark plug issue ).
Any Ideas ???
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Old 05-25-2014, 19:32   #2 (permalink)
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Re: Idle air control valve> How to verify it's working

This may help you with the IAC: P0505 IAC (Idle Air Control) System Malfunction
The IAC may still be functioning, but the feedback to the PCM may be faulty. As far as how far it's supposed to move, can't help you on that. As for the misfire, remember to check for intake manifold leak as well, if you are slowly losing coolant, that could be your cause for misfire.
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