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Home >> Jeep >> 1985 >> CJ7 Base, 4.2 C, Standard, T177 >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> Testing >> Vacuum Spark Control Delay Valve
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Vacuum Spark Control Delay Valve

  1. Connect tee fitting at ports "1" and "4". Connect vacuum gauge to each fitting. Start engine. Vacuum should be equal at both ports. See Figure .
  2. When throttle is suddenly depressed, vacuum at port "1" will instantly decrease and vacuum at port "4" should be maintained momentarily. If valve fails these tests, replace valve.
Fig 1: Spark Control System (4-Cylinder - California)
G9985
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