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Home >> Saturn >> 1996 >> SW1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/O Codes >> Symptoms >> Cuts Out, Misses >> Misfire Isolation
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Misfire Isolation

  1. Start engine. Disconnect IAC motor. Using insulated pliers, remove one spark plug wire from a spark plug and ground it against the engine.
  2. Note engine RPM as wire is grounded. Reconnect spark plug wire. Repeat procedure for all cylinders. Stop engine and reconnect IAC motor.
  3. If engine speed dropped equally (within 50 RPM) on all cylinders, see ROUGH, UNSTABLE OR INCORRECT IDLE, STALLING symptom. If there is no engine RPM drop or if there is excessive variation on one or more cylinder, check spark on the respective cylinder(s).
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