DIAGRAM 3: Ignition System (Part 3 of 3)

PART 3 Of 3: Typical Ignition System Wiring Diagram -2002, 2003, 2004, 2005 4.2L Chevrolet TrailBlazer And GMC Envoy

NOTE: The following tutorial will help you test the camshaft position sensor: How To Test Camshaft Position Sensor (2002-2005 4.2L Chevrolet Trailblazer).

Where To Buy The Ignition Coil And Save

If your test results indicate that an ignition coil is defective on your 4.2L Chevrolet TrailBlazer or GMC Envoy then you should that take a look at the following links and comparison shop. I think you'll save a few bucks by buying it online:

NOTE: The above ignition coils fit the 2002-2005 4.2L Chevrolet TrailBlazer or GMC Envoy.

More GM 4.2L Test Tutorials

If this tutorial was helpful, be sure and take a look at all of the Chevrolet TrailBlazer and GMC Envoy test tutorials in this index: GM 4.2L Index Of Articles.

Here's a sample of the tutorials you'll find there:

  1. How To Test For A Blown Head Gasket (2002-2009 4.2L Chevrolet TrailBlazer).
  2. How Often Should I Replace The Spark Plugs? (2002-2009 4.2L Chevrolet TrailBlazer).
  3. How To Test Engine Compression (2002-2009 4.2L Chevrolet TrailBlazer).
  4. Electronic Throttle Body Tests (2002-2007 4.2L Chevrolet TrailBlazer).
Thank You For Your Donation

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Chevrolet Vehicles:

  • Trailblazer 4.2L
    • 2002, 2003, 2004, 2005

GMC Vehicles:

  • Envoy 4.2L
    • 2002, 2003, 2004, 2005