Duramax - Mass Air-Flow Sensor Troubleshooting & Maintenance Back about the time the auto makers began using electronic fuel injection, they discovered that for the onboard computer to correctly calculate the fuel/air ratio, they needed to measure the incoming air flow to the engine. Electronic ...
The arrow in this image points to the new turbo vane position sensor. A Vane Position Control Solenoid valve (located on right side of turbo center-section) uses engine oil pressure and computer controlled valving to move the turbo's variable vane mechanism. The analog sensor reads the vane p...