[Dave at Pelican Parts]

The sensor is an NTC thermistor--that is, a resistor whose resistance drops off the hotter it gets. It should tell the ECU to shorten the injection pulse when the intake air is warm, and lengthen the pulse when the intake air is cold.

The effect it should have on the mixture is pretty small. It should never tell the ECU not to fire the injectors.

Note that many (all?) 74 1.8s did not have this sensor.

For non-working injectors, I'd try the grounds and the resistor pack, and then check the "extra" wire that goes to the (-) terminal of the coil. That wire tells the ECU when to inject fuel.

--DD