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Home >> Chevrolet >> 1981 >> Pickup K10, 4.1L Eng VIN D, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Pulse Air Injection >> Testing >> Functional Test

Functional Test

  1. Remove air cleaner-to-plenum pipe hose from plenum pipe. Slide a length of tight-fitting 3/4" hose onto plenum pipe and, using an adapter, connect a hand vacuum pump to hose.
  2. Apply 17 in. Hg. Note time required for vacuum level to drop from 17 in. Hg to 6 in. Hg. If less than 2 seconds, remove check valves and test individually. Replace check valve(s) which fail leak-down test.
    NOTE: If system fails leak-down test, ensure that failure is not due to a leaking test hose or connection.
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