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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 407 (Engine Controls - Basic Diagnostic Procedures - 3.1L) >> Ignition Systems >> Electronic Ignition >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. An arcing spark plug wire or an arcing ignition coil to the ICM may cause a stall, misfire or a no start condition.
  2. The following may cause a no start condition:
    • Crankshaft reluctor wheel damage or improper installation.
    • The CKP sensor coming in contact with the reluctor wheel.
    • Foreign material passing between the CKP sensor and the reluctor wheel.
  3. 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.
  4. An improperly installed crankshaft could cause excess crankshaft end play.
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