trouble starting in '86 5kcstq (HELP! More problems!!!)

[Bernard Littau]

Pat writes:
> Many turbo cars come with a full range(boost/vacuum) gauge.
> The gauge usually taps into the intake manifold, which is after the turbo,
> and it will read vacuum at idle.

You mean like the one we have in our 5ktq cars?  The digital full range
vacuum and boost gauge that taps into the intake manifold?

> A free-wheeling compressor wheel will have no effect on the air-flow plate
> compared to the motor's natural vacuum.
>
> You would only be rich under boost.  Metered air would blow out of the
leak
> source instead of burning in the combustion chambers.

How do you reconcile metered air blowing out the leak with a lean condition?
If the air has been metered, the ECU will add gas for that air.  If the air
then leaks, there is still the gas in the system.  That makes rich in my
book.

> ~90 percent of the time the entire intake tract will be in vacuum, meaning
a
> lean condition, upstream or downstream from the compressor wheel.

There is a vacuum only after the throttle body, in the intake manifold.  The
rest of the system is always under pressure.  I believe you forgot to factor
the throttle body into your hypothesis of how the system works.  That, or my
hypothesis of how things work is wrong :-)

>
> If you don't believe me, rip a hole in the Michelin man hose(after turbo)
> and hook up an air/fuel meter.
> Guarantee it will read lean if it idles at all.

What are the terms of your guarantee? :-)

Best,

Bernard Littau
Woodinville, WA
'88 5ktq