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Home >> Toyota >> 1980 >> Pickup Base, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> Mixture Control System >> Testing

Mixture Control System: Testing

  1. Start engine. Disconnect vacuum sensing hose from mixture control valve and block hose.
  2. Place hand over air inlet of mixture control valve. Vacuum should not be felt.
  3. Now, check that vacuum is felt momentarily when hose is connected.
    NOTE: At this time, engine will develop rough idle or die. This is normal.
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