[urq] Bad ISV Causes Racing Idle?

[Todd Phenneger]

Disconnecting the ISV has no effect.  It still idles at 4K RPM.
I guess it must just go open and then stay there.  

Thanks,  I'll find a new one.


--- On Mon, 8/11/08, urq <urq at pacbell.net> wrote:

> From: urq <urq at pacbell.net>
> Subject: Re: [urq] Bad ISV Causes Racing Idle?
> To: "'urq list'" <urq at audifans.com>, "'SpotatAshleys'" <spotatashleys at hotmail.com>
> Date: Monday, August 11, 2008, 7:23 PM
> ... you answered your own question Todd ... "crimping
> the line to the ISV
> causes the idle to die" ... clearly that is the source
> of your high idle.
> You say that you cleaned the ISV ... and I'll assume
> that you made sure it
> was not stuck open at that time.  This would imply that the
> ISV is being
> driven open ... have you disconnected the electrical line
> to the ISV to see
> if the engine dies?  It should.  If it doesn't you ISV
> is the problem, if it
> does you need to look at the idle control module ... 
> 
> Steve B
> San José, CA (USA)
> 
> -----Original Message-----
> From: urq-bounces at audifans.com
> [mailto:urq-bounces at audifans.com] On Behalf
> Of Todd Phenneger
> Sent: Monday, August 11, 2008 12:16 PM
> To: urq list; SpotatAshleys
> Subject: Re: [urq] Bad ISV Causes Racing Idle?
> 
> Yea, I already pulled it and cleaned it with Carb Cleaner
> to no Avail.
> 
> But my questions still exists.  CAN JUST the ISV failure
> cause a car to Idle
> that high.  3,500 - 4,000 RPM.  I mean, crimping the line
> to the ISV causes
> the idle to die so I'm thinking yes, Its just normally
> when I hear of ISV
> failures its cars dying or not idleing well.  But in this
> case, it just
> Idles at 4k RPM.  I didnt realize the ISV could pass that
> much air through.
> 
> 
> --- On Sun, 8/10/08, SpotatAshleys
> <spotatashleys at hotmail.com> wrote:
> 
> > From: SpotatAshleys <spotatashleys at hotmail.com>
> > Subject: Re: [urq] Bad ISV Causes Racing Idle?
> > To: "Todd Phenneger"
> <tquattroguy at yahoo.com>, "urq list"
> <urq at audifans.com>
> > Date: Sunday, August 10, 2008, 2:01 PM
> > Todd
> > They can get gunked up with sticky oil vapour residue
> and
> > ceased to function
> > but check the integrity of the wiring to and from it
> first.
> > regards
> > 
> > Keith
> > 
> > 
> > 
> > ----- Original Message -----
> > From: "Todd Phenneger"
> > <tquattroguy at yahoo.com>
> > To: "urq list" <urq at audifans.com>
> > Sent: Sunday, August 10, 2008 5:10 AM
> > Subject: [urq] Bad ISV Causes Racing Idle?
> > 
> > 
> > > Hi,
> > > The MC-1 I have in my 4ktq started idling at
> about
> > 3,500 suddenly.  I have
> > > tracked it down to what I think may be a bad ISV.
> 
> > When I unplug the ISV,
> > > nothing happens.  But if I pinch shut the hose
> that
> > goes to the ISV, then
> > > the idle drops and if I don't release it then
> the
> > engine will die.
> > >
> > > If the ISV was stuck in the open position, would
> that
> > cause this?
> > >
> > > I'm sure everyone is out in Colorado having
> fun,
> > wish I was there.
> > >
> > > Todd
> > >
> > >
> > >
> > >
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