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Idle Air Valve diagnosis 850

posted by  JGriff on  Mon Dec 3 00:38 CST 2007
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last visit: Sun Dec 9 11:48 CST 2007
[RELATED]

Hi all,
I rencently replaced my fuel pump as well as the fuel return line that I broke the fitting on while replacing the pump.That was fun.
My car still surges at idle from 500-1000 rpms then stalls. Several individuals have suggested Idle Control Valve. I checked the valve electrically per one of my shop manuals and the resistance is OK.I disconnected the top hose and looked inside and it looks as if the mechanism is working OK. If I start the car with out top hose on it doesn't "surge" but idles at a high rpm for about 10 seconds then quits.One peculiar thing I noticed is that when I shut the car off the ICV seems to hum/vibrate for a short time.
From this description does this sound like a bad valve. Any input would be greatly appreciated.
Thanks.
Joel








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    Idle Air Valve diagnosis 850

    posted by  someone claiming to be ksg on  Mon Dec 3 05:17 CST 2007 [RELATED]

    On another car (not a Volvo) I had uneven and often high idling speed and traced it to some dirt in the IAC valve. I sprayed it out with some solvent and black carbon and gunk came out. Car still idles fine now (about 3 years later). May be worth a try even if your IAC looks ok. Is your throttle body clean?








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      Idle Air Valve diagnosis 850

      posted by  JGriff on  Mon Dec 3 12:14 CST 2007
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      last visit: Sun Dec 9 11:48 CST 2007
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      Hello,
      Thanks for the help. I give that a try. Like I was saying it seems as if the valve is OK so I'll try cleaning it. I have never cleaned the throttle body so I'll try that as well as soon as I pick up a gasket at Swedish Engineering.
      Thanks again.
      Joel







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