GM Firebird 1967-1981 Repair Guide

Component Replacement

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INTEGRAL IGNITION COIL



See Figures 1 through 10

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Fig. Fig. 1: To remove the integral coil on HEI systems, remove the plug wires and loom ...



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Fig. Fig. 2: ... then remove the ignition coil cover mounting screws ...



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Fig. Fig. 3: ... and lift the cover off of the distributor cap



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Fig. Fig. 4: Remove the 4 coil hold-down screws ...



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Fig. Fig. 5: ... pull the coil leads out of the connector housing ...



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Fig. Fig. 6: ... then lift the coil and leads out of the distributor cap



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Fig. Fig. 7: Remove the old insulator washer from the bottom of the coil ...



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Fig. Fig. 8: ... then remove and adjust the contact button out of the distributor cap



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Fig. Fig. 9: At this point, it is a good idea to inspect the cap as well, so disengage the cap retainers ...



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Fig. Fig. 10: ... and lift the cap off of the distributor

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the feed and module wire terminal connectors from the distributor cap.
  4.  
  5. Remove the ignition set retainer.
  6.  
  7. Remove the 4 coil cover-to-distributor cap screws and the coil cover.
  8.  
  9. Remove the 4 coil-to-distributor cap screws.
  10.  
  11. Using a blunt drift, press the coil wire spade terminals up and out of distributor cap.
  12.  
  13. Lift the coil up and out of the distributor cap.
  14.  
  15. Remove and clean the coil spring, rubber seal washer and coil cavity of the distributor cap.
  16.  
  17. Coat the rubber seal with a dielectric lubricant furnished in the replacement ignition coil package.
  18.  
  19. Reverse the removal procedures to install.
  20.  

DISTRIBUTOR CAP



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the feed and module wire terminal connectors from the distributor cap.
  4.  
  5. Remove the retainer and spark plug wires from the cap.
  6.  
  7. Depress and release the 4 distributor cap-to-housing retainers and lift off the cap assembly.
  8.  
  9. Remove the 4 coil cover screws and cover.
  10.  
  11. Using a finger or a blunt drift, push the spade terminals up and out of the distributor cap.
  12.  
  13. Remove all 4 coil screws and lift the coil, coil spring and rubber seal washer out of the cap coil cavity.
  14.  
  15. Using a new distributor cap, reverse the removal procedures to assemble, being sure to clean and lubricate the rubber seal washer with dielectric lubricant.
  16.  

ROTOR



  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the feed and module wire connectors from the distributor.
  4.  
  5. Depress and release the 4 distributor cap-to-housing retainers and lift off the cap assembly.
  6.  
  7. Remove the two rotor attaching screws and rotor.
  8.  
  9. Reverse the removal procedure to install.
  10.  

VACUUM ADVANCE (1975-80 MODELS)



See Figures 11 and 12

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Fig. Fig. 11: After removing the distributor cap, loosen the rotor retaining screws ...



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Fig. Fig. 12: ... and lift the rotor off of the distributor shaft flange

  1. Remove the distributor cap and rotor as previously described.
  2.  
  3. Disconnect the vacuum hose from the vacuum advance unit.
  4.  
  5. Remove the two vacuum advance retaining screws, pull the advance unit outward, rotate and disengage the operating rod from its tang.
  6.  
  7. Reverse the removal procedure to install.
  8.  

MODULE



See Figure 13

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Fig. Fig. 13: When installing a replacement module, make certain to apply silicone lubricant (usually supplied with the module) to both mating surfaces

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the distributor cap and rotor as previously described.
  4.  
  5. Detach the harness connector and pick-up coil spade connectors from the module. Be careful not to damage the wires when removing the connector.
  6.  
  7. Remove the two screws and module from the distributor housing.
  8.  
  9. Coat the bottom of the new module with dielectric lubricant supplied with the new module. Reverse the removal procedure to install.
  10.  

 
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