GORNATI,
The air temp sensor is in a runner from the carb to
a cylinder. The water temp sensor in the coolant
somewhere; I've seen them at the thermostat or in
the back pipe to the heater. They are interchangeable,
should measure around 1000 ohms at room temp. If
only one is good, make sure it is in the water till you
get another.
I don't charge to check out your ECU. But postage &
customs could be a problem here. Most ECUs need
something; I usually recommend getting them checked
so you can cross it off the problem list. If your
pulse widths are OK, the MAP is probably OK too.
Keeping a spare ECU can help, though people that
far away sometimes just give up the fuel injection and
put on a carb.
I'm retired, advisor to the CLC (Cadillac LaSalle Club). I
think their web site is under construction for a few days.
I don't often sell ECUs, but if I had your model, it
would be a small fraction of the $350 the Ebay guy
wants. Don't know who that is, I wonder if he can
test & repair them as well as I do?
Lots of ECUs are marked "REMANUFACTURED". Not
to worry, they are OK but renumbered. If you give me
your email, I can send a list of ECUs and what they fit.
And my EFI checklist. I'm
bcroe@juno.com
The usual problem with mixture, is a failing MAP
sensor in the ECU. If it is putting out low voltage
now, it will soon fail completely. Its on picture 10
(SH 8) of ALBUM-78 K ECU SCHEMATIC. Notice
that there is a test point VMAP where you can measure
the MAP voltage, a 5 pin connector on the side. Or with
ignition on but not running, no hose connected, you
can remove the cover and and measure the MAP voltage
at its pin, or wire jumper 13. It should be 9.5V input,
7 to 7.5V output. The 7V will drop to 0-2V as vacuum
is applied. The hose to the ECU connects to the MAP.
If it is failing, I could install one of my replacements.
Once the engine is hot, your ECU should put out a
fuel injector pulse width around 4ms at idle, 8 ms at
cruise, and near 12ms at Wide Open Throttle.
deVille33 also gives good advice. Most cars that age
should get a new timing chain; the original cam sprocket
has plastic teeth which fall off, block oil flow, and let
pistons hit valves. You can check it without taking the
engine apart.
good luck, Bruce Roe