1977-79 Models
- Ensure engine oil temperature is above 120°F (50°C) and that engine is fully warmed up. Disconnect wires at control pressure regulator. Disconnect airflow sensor and turn ignition on.
- Using a voltmeter, check voltage at regulator wires. Voltage should be a minimum of 11.5 volts. Using ohmmeter (ignition off), check resistance of heating coil. Reading should be about 20 ohms. Replace control pressure regulator if defective.