lemon-mirror:
Home >> Chevrolet >> 1976 >> Luv Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Evaporative Emissions System >> Testing

Evaporative Emissions System: Testing

  1. With engine cold, place transmission in Neutral or Park and apply parking brake. Start engine and observe movement of actuator rod and exhaust heat valve. Valve should move to its closed position.
  2. If valve does not close, disconnect hose at actuator and check for vacuum. If vacuum is present, replace actuator. If no vacuum is present, disconnect hose at TVS-to-vacuum source. If there is vacuum at hose, replace TVS. If no vacuum is present, check hose for leaks and for plugged vacuum source.
  3. When coolant temperature reaches 180°F (V8) or oil temperature reaches 150°F (6-cylinder), exhaust heat valve should move to the open position.
  4. If valve does not open, disconnect hose at actuator and check for vacuum. If there is vacuum, replace TVS. If no vacuum is present, replace actuator.
· About lemon-mirror