GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Ignition Coil

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The ignition coil is contained in the distributor cap and connects through a center contact to the rotor.

The capacitor, if equipped, is part of the coil wire harness assembly. The capacitor is used only for radio noise suppression.

TESTING



Ignition Coil
  1. Detach the wiring connectors at the distributor cap. If necessary, label the position of each wire prior to disconnecting it.
  2.  
  3. Turn the four screws and remove the cap and coil assembly from the distributor lower housing.
  4.  
  5. Inspect the interior and exterior of the cap for signs of tracking. If tracking is present, replace the cap.
  6.  



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Fig. Testing the ignition coil in the distributor cap-4.5L and 4.9L engines



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Fig. Removing the distributor cap and coil assembly from the housing

  1. Connect an ohmmeter across the coil terminals, which are the outermost terminals located in the recessed boss of the cap.
  2.  
  3. If the reading is not at 0, or nearly 0, replace the coil.
  4.  
  5. Connect the test leads of an ohmmeter to the coil center contact, located in the center of the cap. Attach the other test lead to the center terminal of the 3-wire connector, located on the cap. Make sure to set the ohmmeter to the highest setting.
  6.  
  7. If the reading is infinite, replace the ignition coil.
  8.  


NOTE
If no problems are found, then the coil may still be faulty, but will have to be checked on a scope.

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Detach the wiring connectors at the distributor cap. Remove the cap from the distributor housing.
  4.  
  5. Remove the coil cover attaching screws on the top of the cap. Remove the cover from the cap.
  6.  
  7. Remove the ignition coil attaching screws and lift the coil with leads, from the cap.
  8.  
  9. Inspect the cap for signs of carbon tracking on the inside of the cap, below the coil.
  10.  
  11. Remove the ignition coil arc seal. Clean with soft cloth and inspect cap for defects, replace cap as required.
  12.  



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Fig. Ignition coil attaching screws-4.5L and 4.9L engines



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Fig. Ignition coil removed from cap-4.5L and 4.9L engines

 
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