Just a quick note.
I was finally able to get an appointment with my brother, who's been a
mechanic for 40 years, and here's what we found;
Checked the fuel pressure - 58 lbs, well within limits. Then turned off
ignition, pressure dropped like the stock market in 1929, hmmm.
Clamped return line, re-test pressure. Turn off ignition, pressure drop
again, just as fast as before.
"Aha!" We say, "A bad injector unit! We shall replace it and all will
be right with the world."
We replaced the fuel injector unit, ($250.00), my brothers cost, and
before putting the intake manifold back together turned the key on to
check for leaks.
Turns out that both the pressure line and the return line have pinhole
leaks inside the manifold, causing the rich exhaust and low mileage, and
the spark plugs to show a rich burning condition on one side of the
Those lines are now on order.
I"m not sure what the moral of this is, unless it's "Never count your
goldfarbs before they cackle."
Further news shall follow.