OK, I scoured the '89 FSM, and couldn't find it. (Trying to use the manual
that best matches your vehicle.) But since I know I've seen it, I jumped over to
the '95 FSM, and sure enough there it was:
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OK. With an ohmmeter you can use the table to measure the resistance of the
ECT sensor to engine ground, using the ambient temperature of your shop
as the input to this table. For example, if your garage is at 50° F, then your
ohmmeter should measure in the neighborhood of 5670 ohms. If it's way off
then we need to get a good sensor installed and see what we now have.
****
To recap the last couple of replies, based on the coloring of the spark plugs, the
quantity of fuel being sprayed, and the need to use the Clear Flood function to
get the engine to fire, instead of a too little fuel problem, we seem to have too
much during cold cranking. Just as soon as you can make this measurement
and share it we should be able to figure out which way to go forward.
Best of luck --