Yup, I hear you.  The point of my initial response was
two-fold:

1. You failed to mention the idle adj screw.
2. To indicate you may have other trouble than just
the idle affecting your ability to pass emissions.  I
run at 5 BTDC and easily pass both idle and high rev
emissions.

I am not disagreeing with your response in regards to
how the components of the FI system work.

Z

--- Jay L Snyder <Jay.L.Snyder@invista.com> wrote:
>
> Yes, idle speed is initially set by the screw, but
> it is controlled by the
> idle stabilizer.  If you turn the idle speed screw
> while the engine is
> running, the stabilizer will try its damnedest to
> maintain 900 rpm.  If you
> get too far off, it will start cycling up and down.
> This is why you need
> to set both the idle speed and the timing with the
> stabilizer by-passed.
> (Put your timing light on the crank with and without
> the stabilizer in
> place.  You will see the timing jumping around with
> it on-line.  Without
> it, the mark stays put.)  My point is, with the
> timing advanced to 5BTDC,
> the stabilizer can not  as effectively control the
> idle speed.   It is
> already advanced 10 degrees from stock.  I have seen
> this over and over.
> The idle wanders high and drifts.  I was failed at
> my last inspection for
> this reason. (They check idle speed as well as
> tailpipe emissions.)  I knew
> my timing was advanced to around 2BTDC.  I pulled in
> the parking lot,
> loosened the distributor clamp and turned the
> distributor.  The idle
> settled down and I went back through for a re-test.
> Only ten minutes
> later,  all passed easily.  I checked the timing
> when I got home and it was
> set a about 2 or 3 ATDC.
> The Digijet distributor has a vacuum retard built
> into it for emission
> purposes.  The retarded timing (5ATDC) causes it to
> burn hotter and cleaner
> at idle.  As soon as the throttle is cracked, the
> retard goes away.  Total
> advance is in line with  the other engines.
> All of this is in the Bentley.
>
>
>              Jay
>
>
>
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