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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 353 (ENGINE CONTROLS - TROUBLE SHOOTING - NO CODES - 2.2L Bi-Fuel) >> Symptoms >> Poor Fuel Economy >> Ignition System Checks

Ignition System Checks

WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove and inspect the spark plugs for wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits.
  2. Check for an open Ignition Control (IC) circuit.
  3. Check the spark plug wires for cracking, hardness and proper connections and routing.
    4. NOTE: More timing advance is required to operate the vehicle on CNG than on gasoline.
  4. Check for proper operation of the Knock Sensor system.
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