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Home >> Toyota >> 1987 >> 4Runner SR5, 22-RTE >> Repair and Diagnosis >> Engine Performance >> System >> Mixture Control System >> System Testing
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System Testing

  1. Remove air cleaner cover and air filter. 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. At this time, engine will develop rough idle or die. This is normal. Reconnect all hoses, air filter and air cleaner cover.
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