Re: [DML] High Idle

[JDub <doki_pen@xxxxxxxxx>]

Bill,
     In response to your e-mail so everybody's on the
same page:

> Are you sure the big O rings on your U pipes are the
> right size, and
> in good condition? 

The O-rings definately are not leaking I checked that.
 

> The nipple you were blowing through is ported
> vacuum.

Of course, I said I was pumping 5psi air in to the
vacuum port.

> If you sprayed
> soapy water on the
> upstream side (towards the air sensor plate) of
> course you'd see bubbles.

I was spraying the bubbly water on to the other side
of the butterflies.  The soapy water confirmed that
air is getting by the throttle shaft where it passes
through the throttle body.

> Rotating motion will inevitably
> wear oblong holes
> over time. Sorry (happens on carburetors too).

Yep, I guess it's time to purchase a new throttle body
:) I have one more test to perform today before I make
the purchase, but I'm pretty sure that we've nailed
down the problem.

Jon

--- content22207 <brobertson@xxxxxxxxxxxx> wrote:

> 
> 
> 
> Are you sure the big O rings on your U pipes are the
> right size, and
> in good condition? Make sure you have spacers behind
> each one, and
> that the spacers are located towards the U pipes,
> not the throttle
> plate housing. FWIW I never could get a 100% seal on
> mine, so I made a
> custom "figure 8" gasket to force the O rings a
> little bit closer and
> also seal the aluminum mating surfaces.
> 
> The nipple you were blowing through is ported
> vacuum. On the PRV it
> never closes (is located upstream of the throttle
> plates). When the
> throttle plates open over it, vacuum is allowed
> through (dropping with
> overall decreasing engine vaccum). If you sprayed
> soapy water on the
> upstream side (towards the air sensor plate) of
> course you'd see bubbles.
> 
> The throttle plate shaft is made of steel. The
> throttle plate housing
> is made of aluminum. Rotating motion will inevitably
> wear oblong holes
> over time. Sorry (happens on carburetors too).
> 
> Bill Robertson
> #5939
> 
> >--- In dmcnews@xxxxxxxxxxxxxxx, JDub
> <doki_pen@xxxx> wrote:
> > 
> > The stop screw is backed all the way out.
> > 
> > I tested for leaks in the butterflies today. 
> Here's
> > what I did:
> > 
> > I took off the throttle body and fed 5psi of air
> in to
> > the vacuum port on the bottom of it.  While
> holding
> > the throttle body down on a piece of cardboard I
> > sprayed soapy water down on to the butterflies and
> > could see bubbles coming from all around them and
> from
> > the shafts on the left and right sides.  I still
> don't
> > know if this is enough of a leak to make the
> engine
> > idle high, what do you think? Should the shafts
> seal
> > %100?
> > 
> > Jon
> > 
> > 
> > --- David Teitelbaum <jtrealty@xxxx> wrote:
> > 
> > > 
> > > 
> > > 
> > > The most likely reason for air to be getting
> past
> > > the throttle plates
> > > is that the stop screw on the throttle arm is
> not
> > > adjusted properly
> > > allowing the plates to be cracked open a little.
> You
> > > might also have a
> > > decel valve that is dirty and leaking. They are
> > > those little thingies
> > > with the springs on the throttle plates. They
> should
> > > move freely and
> > > seal tight.
> > > David Teitelbaum
> > > vin 10757
> > > 
> > > 
> > > --- In dmcnews@xxxxxxxxxxxxxxx, JDub
> <doki_pen@xxxx>
> > > wrote:
> > > > 
> > > > So I did a little test today, I put a piece of
> > > > cardboard between the throttle body and the
> air
> > > > metering unit.  I hooked back up the idle
> speed
> > > motor
> > > > and the car idled perfect! Right on 775 RPMS. 
> So
> > > I
> > > > now know the problem is with air getting by
> the
> > > > butterflies in the throttle body.  Do you
> think
> > > it's
> > > > possible those spring loaded little thingys
> could
> > > be
> > > > defective?  I guess it could still be air
> slipping
> > > by
> > > > t
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
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> for
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> > > 
> > >  
> > > 
> > > 
> > > 
> > >
> 
> 
> 
> 
> 
> 
> 
> 
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>  
> 
> 
> 
> 






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