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When the engine runs at low idle, the temperature of an exhaust manifold port can indicate the condition of a unit injector:
A low temperature indicates that no fuel is flowing to the cylinder. An inoperative unit injector pump could cause this low temperature.
A very high temperature can indicate that too much fuel is flowing to the cylinder. A malfunctioning unit injector could cause this very high temperature.
Use the 349-4200 Infrared Thermometer to check this exhaust temperature.