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Diagnostic Aids

  1. The following conditions may cause an engine cranks but won't start symptom:
    • Crankshaft reluctor wheel damage or improper installation.
    • The sensor is coming in contact with the reluctor wheel.
    • Foreign material passing between the sensor and the reluctor wheel.
    • If the crankshaft rotates backwards, this symptom may occur. This condition is only with vehicles equipped with a manual transmission. This condition can occur when a vehicle is on an incline and the clutch is released and an engine stall occurs.
  2. Excess crankshaft end play will cause the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in any of the following conditions:
    • A no start.
    • A start and stall.
    • Erratic performance.
  3. An improperly installed crankshaft could cause excess crankshaft end play.
  4. For an intermittent, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L ION article.
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