GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Ignition Coil Pack

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REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support it with jackstands.
  4.  
  5. Remove the passenger side tire and wheel assembly.
  6.  
  7. Lift up the rubber flap on the wheel well to access the coil pack.
  8.  
  9. Tag and disconnect the spark plug wiring from the coil(s).
  10.  
  11. Remove the coil retaining screws (there are 2 screws per coil).
  12.  
  13. Separate the coil from the ignition module.
  14.  

To install:
  1. Install the coil to the ignition module assembly.
  2.  
  3. Install the coil retaining screws and tighten to 40 inch lbs. (4.5 Nm).
  4.  
  5. Engage the spark plug wire to the coil(s) and noted during removal.
  6.  
  7. Place the rubber flap back in position and lower the vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the ignition coils and ignition module assembly

TESTING



  1. Remove the ignition coil(s).
  2.  
  3. Using an ohmmeter, check the resistance between the primary terminals on the underside of the coil. The resistance should be 0.50-0.90 ohms.
  4.  
  5. Check the resistance between the secondary terminals. It should be 5000-10,000 ohms.
  6.  
  7. If the coil failed either test, replace the coil.
  8.  

 
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