[T3] Since I replaced the runner boots and all vacuum lines noticed

[Mike Fisher]

My '69 FI/AT dies too easy when started in parking lots etc & put in
reverse when set at 900 idle.  Pretty embarrassing to have happen when
backing out of a parking space!  If I have my idle set at 1000 it never
dies & I don't have any complaints about how it runs/shifts. :-)

On Fri, Jun 7, 2019 at 9:10 AM William Jahn <willjahn975 at gmail.com> wrote:

>  I know once at idle the enrichment is out of the picture simply because of
> the forked switch the design of the TPS. It's also out of the picture any
> time you let off the gas since once you do the forked switch breaks the
> connection to all functions of the enrichment while cruising the forked
> switch on the enrichment and why if there are worn spots you get bucking.
> The trigger points are what send the RPM signal to the ECU. I thought the
> idle pad on the TPS was mainly a function of a signal sent to the ECU
> similar to what Porsche used when they had knob on the ECU to adjust or
> fine tune the idle richness. I can see how it cuts off the injectors just
> not how it does so at specific RPM ranges. I'm not asking anyone to offer
> me a course on how D-Jet works just trying to make sense to answers to
> questions I've asked.
>
>  I realize the Auto trans load is going to drop the engine RPM it's a load
> and nothing like modern FI systems where that load is compensated for you
> might see the drop for a second. Or like some older cars with a throttle
> kicker . Before I did all this work the RPM drop was not so drastic . All
> the Bentley states is what an auto trans engine RPM should be not how to
> actually set it , simple on a standard trans. I set mine @1000 warmed up
> and AAR closed in my case plugged since I can't trust it's fully closed I
> guess all I can do is lower the idle to 900 or a bit more it was not so
> drastic before when set lower.
>
> On Fri, Jun 7, 2019 at 8:18 AM Jim Adney <jadney at vwtype3.org> wrote:
>
> > On 6 Jun 2019 at 15:09, William Jahn wrote:
> >
> > > Does this mean @ idle all that tells the ECU to fire the injectors are
> > the
> > > trigger points?
> >
> > no
> >
> > > I am trying to figure out how this works since my idle
> > > because of the AAR is 1300 RPM in park and 1000 in drive.
> >
> > There's really no mystery as to why the rpms are lower under load than
> > without load.
> >
> > > I thought once
> > > you let off the gas due to the 2 way switch once you let off the gas
> then
> > > that switch cuts off all the functions of the enrichment didn't know it
> > was
> > > RPM dependent.
> >
> > The @ idle switch has nothing to do with enrichment. In the idle
> position,
> > the
> > enrichment contacts are not in use.
> >
> > > Did you ever get a chance to see
> > > what your 73 does with that sensor unplugged?
> >
> > No, sorry, too many other things on my plate for that to rise to the top.
> >
> > > Maybe the gradual rise is the time it takes for the MPS to adapt to
> > > the vacuum change.
> >
> > There's a spring loaded flapper valve in the MPS inlet that alters the
> MPS
> > response time depending on whether air is trying to get in or get out.
> The
> > delay on opening the throttle is less than on closing. I'm guessing they
> > are
> > on the order of 0.5 sec and 3 sec. I don't think there's any measurable
> > response time in addition to that.
> >
> > --
> > *******************************
> > Jim Adney, jadney at vwtype3.org
> > Madison, Wisconsin, USA
> > *******************************
> >
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-- 
Eugene, Oregon

http://s169.photobucket.com/albums/u236/mr_bojangles500/
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