Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Ignition Coil & Module

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Removal & Installation



  1. Tag and unplug the wiring connectors from the coil and the coil wire.
  2.  
  3. Unfasten the retainers securing the coil bracket and coil to the manifold.
  4.  
  5. Remove the coil and bracket and drill out the two rivets securing the coil to the bracket.
  6.  
  7. Remove the coil from the bracket.

    Click image to see an enlarged view

    Fig. Ignition coil mounting-4.3L engines

  8.  

To install:


NOTE
The replacement coil kit may come with the two screws to attach the coil to the bracket. If not, you must supply your own screws.



Click image to see an enlarged view

Fig. Ignition coil mounting-5.0 and 5.7L engines



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Fig. Ignition coil mounting-7.4L engines

  1. Fasten the coil to the bracket using two screws.
  2.  
  3. Fasten the coil and bracket to the manifold. Tighten the retainers until they are snug.
  4.  
  5. Engage the coil wire and the wiring connectors to the coil.
  6.  

Testing




NOTE
Make sure the ignition switch is OFF .

  1. Tag and disconnect the wires from the ignition coil.
  2.  
  3. Using a digital ohmmeter set on the high scale, probe the ignition coil as shown in Step 1 of the accompanying illustration.

    Click image to see an enlarged view

    Fig. Ignition coil testing points

  4.  
  5. The reading should be infinite. If not replace the coil.
  6.  
  7. Using the low scale of the ohmmeter, probe the ignition coil as shown in Step 2 of the accompanying illustration. The reading should be 0.1 ohms, if not replace the coil.
  8.  
  9. Using the high scale of the ohmmeter, probe the ignition coil as shown in Step 3 of the accompanying illustration. The reading should be 5k-25k ohms, if not replace the coil.
  10.  
  11. Reconnect the wires to the ignition coil.
  12.  

 
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