Date: Sat, 11 Mar 2017 00:51:36 -0500
Reply-To: David Beierl <dbeierl@ATTGLOBAL.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Beierl <dbeierl@ATTGLOBAL.NET>
Subject: Re: Idle Air Control Valve
In-Reply-To: <CAFdLW6mLm0E0+JbNNEf0LyMj2j6j=2jdJdbLwoyRuGz-adewZw@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Fascinating. But pick and choose from it with great care. You should
never adjust the idle speed screw on the throttle body unless the idle
speed stabilization is disabled by unplugging the control valve. That sets
the basic idle speed. And of course there's no pump involved other than
the engine itself.
Yrs,
d
On Fri, Mar 10, 2017 at 11:12 AM, Dan N <dn92610@gmail.com> wrote:
> hi all,
>
> I just found this and I want to share...
>
> *the problem: *
> high idle and it can't be adjusted lower...
>
> *things done:*
> - clean and check throttle body
> - replace and adjust the TPS (throttle body switch)
> - replace the temp2 sensor
> - replace oxygen sensor
> - replace all vacuum lines
> - new air filter
> - clean AFM
> - new throttle body gasket
> - clean and check throttle body valve
> - replace the ICU, idle control unit with a known good one from a perfect
> running van
>
> and.. the idle still hanging high about 1500 rpm *(with the idle screw
> closed all the way down)*
>
> I was temped to replace the Idle Air Control Valve...but since a new Idle
> Air Control Valve is pricey ($240.00) I tried this last attempt before
> throwing it away although it seems working good (it vibrates w. ignition
> on)
>
> *the discovery and fix:*
> in the back of the Idle Air Control Valve, between the 2 connectors,
> there's a small allen screw....
> - I turn the allen screw out (counter clockwise), put it back on and the
> idle went even higher (1800 rpm)
> - so I turn the allen screw in (clockwise), put it back on and the idle
> went lower (1100 rpm)
> - after giving that allen in one more turn, the idle went to 900 rpm
> - I left it at 900 rpm and open up the idle control screw to set the idle
> at 950 rpm..
>
> now I have a perfect idle at 950 rpm w. the idle screw in the middle..
> which I can play with it..
>
> I think for some reason the idle control valve is pumping a higher volume
> of air and the allen screw is lowering the air volume either by lowering
> the speed of the pump or restricting the air.. *(my theory)*
>
> if you have similar problem try it
>
> dan
>
|