BTDT request - oil sensor / light / system behavior

[Dave Haupt]

New symptom on an '89 10V200Q (but I think much of the
audo-check system is the same).

Thanks to leaking injectors, the vehicle must be
cranked for some time (20-30 seconds) when warm to get
it started.  Lately, at about the 15-20 second mark, a
high-pitched electronic "warning" makes itself heard,
and an "oil" indicator shows up on the multi-function
display on the dash.  The "oil" indicator is an oil
can with drops falling out of it - interesting
animation, actually.

The oil level in the engine is full.  At the same time
this indicator appears on the dashboard, the oil
pressure gauge is showing about 1 bar (remember, this
is while cranking, not after starting).  

The oil "warning" continues to display and sound as
long as I crank.  Ten seconds later, the engine
starts, with the usual stink of too much fuel (the
flooding is why it took so long to crank).  As soon as
the engine starts, the oil warning disappears, and the
oil pressure gauge pops on over to full scale, 5 bars.
 After enough time for the engine and oil to warm up,
the oil pressure settles down to the 1-3 bar range,
depending on whether I'm idling or at driving RPM.

Is this symptomatic of something actually failing?  Or
after this much cranking, are the instruments
fundamentally not going to make decent measurements
and incorrectly show an oil problem?  Most surely, if
I got the leaky injectors replaced, it would require
only seconds of cranking, and I'd never get to the
"screech and light" stage.

What do the sage gurus of Quattrodom think on these
things?

Kindly,

Dave
Santa Rosa, CA

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