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87 244 rough running at start 200 1987

The ECT sensor's operation is worth checking. It is the "choke" and a most important part of the fuel system for starting and warmup.

The way I would check it and have done in the past, is meter the voltage on ECU pin 2 at key on before cranking, and then continuously as the motor warms up. This is better than just replacing it, because you will immediately know whether you even need to get dirty under the hood to guess at the condition of the wires and connectors under the manifold. And it checks everything; wiring, connector, and sensor.

Take the shell off of the ECU connector and probe the side of it just as described on page 241-11 in the Bentley. Observe the voltage with reference to ground at the blue wire. Some will just divide the blue wire from the cable and pierce its insulation to access, instead of using a probe on the connector.

The voltage you'll expect follows this temperature curve. The particulars are shown for the dual element thermistor used in LH2.4, but the single element in yours for pin 2 yields the same results.




--
Art Benstein near Baltimore

An elderly father asked his son if he could borrow a newspaper.

“Father, this is the 21st century,” replied the son. “I don’t waste my money on newspapers. But if you like, you can borrow my iPad.”

The spider never knew what hit it.






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