there is also a cold start switch/sensor aside from the cold start injector
it's mounted upfront near the thermostat housing .
i wouldn't just replace the cold start injector , i would take it out and try to get it cleaned before actually replacing it
http://www.cygnusx1.net/supra/librar.../ec/EC_04.html
see the BVSV in the diagram , thats not the cold start sensor but the sensor is just below that BVSV