Re: [DML] High Idle

["content22207" <brobertson@xxxxxxxxxxxx>]

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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> > 
> >  
> > 
> > 
> > 
> >








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