If the temperature sensor circuit is open or shorted, the ECU assumes the engine temperature is 20 deg C or 68 deg F while starting, then when running, assumes the engine temperature is 80 deg C or 176 deg F. I assume not rich enough in the morning as it thinks its already warming up, and too rich after warm as it still thinks its not hot @ 176 ...
2-pin coolant temp sensor for a variety of late 80's / 90's VW's. Fits the following applications:-Corrado G60 / VR6, 1989-1995-Mk2 Golf / Jetta 1.8 8v / 16, 2.0 16v, 1988-1992 Coolant temperature sensors are used by the fuel management system to detect the engine's operating temperature. Depending on the sensor information, the control unit adapts the injection time and firing angle to the operating conditions. The sensor is a temperature sensor with a negative temperature coefficient.
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