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Thread: Idle Air-Control valve, testing:-

  1. #1 Idle Air-Control valve, testing:- 
    club member Club Member kahawi's Avatar
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    Ford 2.3ltr DOHC-16valve fuel-injected.

    Idles at about 12-1300 rpm, which seems a bit high? Otherwise runs fine.

    Does anyone have experience of testing the idle air-flow valve? It’s a two-pole device, so I assume 5-12volts will open it and either a spring return, or reversing the power closes it again?

    Too much ‘electrickery’ under the bonnet for my liking, but I’m wondering if I have a slight leak, either in the valve seating or the jointing gasket, would that cause higher idle revs?

    Cheers, Colin B
    Marlin Hunter R500 ULA 1997 Ford-Based Hunter with 2.3 DOHC L4 engine, chassis/kit No. 157
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  2. #2 Re: Idle Air-Control valve, testing:- 
    club member Club Member
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    Whilst I am not familiar with that particular Idle Control Valve, ones on other engines respond well to a clean with the likes of WD 40. The part of the valve that slides or rotates gets gummed up.
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  3. #3 Re: Idle Air-Control valve, testing:- 
    club member Club Member
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    I had a similar problem with the 8valve DOHC engine with the idle speed fluctuating between about 12 - 1500rpm. Cleaned the idle control valve but made no difference. Then replaced it with a new one (expensive!) and again made no difference. On advice from someone (can't remember who) I replaced the Throttle Position Sensor (TPS) and it solved the problem. Don't ask me how or why!
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  4. #4 Re: Idle Air-Control valve, testing:- 
    Moderator Club Member
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    You should be able to feel a slight vibration through it with the engine running, if you can then it's likely ok . Air leaks as usual can be checked by spraying brake cleaner or similar around the valve. If those items check out ok then I would go with Geoff's suggestion of TPS .
    The one I had on my BMW engined Cabrio could be rotated to some degree for adjustment purposes and seemed quite critical in getting it right.
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